./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/loop-floats-scientific-comp/loop2-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version a4ecdabc Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/loop-floats-scientific-comp/loop2-1.c -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 02e16371708027ec56fdf0402c3e1a5d4f23a0ff ......................................................................................................................................................................................................................................................................................................................................... Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/loop-floats-scientific-comp/loop2-1.c -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 02e16371708027ec56fdf0402c3e1a5d4f23a0ff ............................................................................................................................................................................................................................................................................................................................................................ Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE --- Real Ultimate output --- This is Ultimate 0.2.0-a4ecdab [2020-10-24 23:27:38,973 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-24 23:27:38,976 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-24 23:27:39,043 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-24 23:27:39,044 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-24 23:27:39,049 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-24 23:27:39,052 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-24 23:27:39,060 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-24 23:27:39,063 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-24 23:27:39,072 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-24 23:27:39,074 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-24 23:27:39,079 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-24 23:27:39,080 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-24 23:27:39,084 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-24 23:27:39,086 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-24 23:27:39,088 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-24 23:27:39,089 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-24 23:27:39,093 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-24 23:27:39,096 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-24 23:27:39,100 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-24 23:27:39,102 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-24 23:27:39,104 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-24 23:27:39,106 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-24 23:27:39,107 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-24 23:27:39,110 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-10-24 23:27:39,110 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-10-24 23:27:39,111 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-10-24 23:27:39,112 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-10-24 23:27:39,113 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-10-24 23:27:39,114 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-10-24 23:27:39,114 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-10-24 23:27:39,115 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-10-24 23:27:39,117 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-10-24 23:27:39,118 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-10-24 23:27:39,119 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-10-24 23:27:39,119 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-10-24 23:27:39,120 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-10-24 23:27:39,121 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-10-24 23:27:39,121 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-24 23:27:39,122 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-24 23:27:39,123 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-24 23:27:39,124 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2020-10-24 23:27:39,160 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-24 23:27:39,163 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-24 23:27:39,165 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-24 23:27:39,167 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-24 23:27:39,167 INFO L138 SettingsManager]: * Use SBE=true [2020-10-24 23:27:39,167 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-24 23:27:39,168 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-24 23:27:39,168 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-24 23:27:39,168 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-24 23:27:39,168 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-24 23:27:39,170 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-24 23:27:39,170 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-24 23:27:39,170 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-24 23:27:39,171 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-24 23:27:39,171 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-24 23:27:39,171 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-24 23:27:39,171 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-24 23:27:39,172 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-24 23:27:39,172 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-24 23:27:39,172 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-24 23:27:39,173 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-24 23:27:39,173 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-24 23:27:39,173 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-24 23:27:39,173 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-10-24 23:27:39,174 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-10-24 23:27:39,174 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-24 23:27:39,174 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-10-24 23:27:39,174 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-24 23:27:39,175 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-24 23:27:39,175 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/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 02e16371708027ec56fdf0402c3e1a5d4f23a0ff [2020-10-24 23:27:39,631 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-24 23:27:39,665 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-24 23:27:39,670 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-24 23:27:39,672 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-24 23:27:39,673 INFO L275 PluginConnector]: CDTParser initialized [2020-10-24 23:27:39,674 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loop-floats-scientific-comp/loop2-1.c [2020-10-24 23:27:39,771 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9390db879/d5a485718bbe43d1a1d07bfbe29de0d2/FLAGabb9598fe [2020-10-24 23:27:40,475 INFO L306 CDTParser]: Found 1 translation units. [2020-10-24 23:27:40,476 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loop-floats-scientific-comp/loop2-1.c [2020-10-24 23:27:40,484 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9390db879/d5a485718bbe43d1a1d07bfbe29de0d2/FLAGabb9598fe [2020-10-24 23:27:40,845 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9390db879/d5a485718bbe43d1a1d07bfbe29de0d2 [2020-10-24 23:27:40,849 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-24 23:27:40,855 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-10-24 23:27:40,860 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-24 23:27:40,860 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-24 23:27:40,864 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-24 23:27:40,865 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 11:27:40" (1/1) ... [2020-10-24 23:27:40,875 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3ab9eab8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:27:40, skipping insertion in model container [2020-10-24 23:27:40,876 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 11:27:40" (1/1) ... [2020-10-24 23:27:40,884 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-24 23:27:40,900 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-24 23:27:41,097 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-24 23:27:41,108 INFO L203 MainTranslator]: Completed pre-run [2020-10-24 23:27:41,132 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-24 23:27:41,149 INFO L208 MainTranslator]: Completed translation [2020-10-24 23:27:41,150 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:27:41 WrapperNode [2020-10-24 23:27:41,151 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-24 23:27:41,152 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-10-24 23:27:41,152 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-10-24 23:27:41,153 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-10-24 23:27:41,162 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:27:41" (1/1) ... [2020-10-24 23:27:41,171 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:27:41" (1/1) ... [2020-10-24 23:27:41,201 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-10-24 23:27:41,202 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-24 23:27:41,203 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-24 23:27:41,203 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-24 23:27:41,213 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:27:41" (1/1) ... [2020-10-24 23:27:41,213 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:27:41" (1/1) ... [2020-10-24 23:27:41,215 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:27:41" (1/1) ... [2020-10-24 23:27:41,216 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:27:41" (1/1) ... [2020-10-24 23:27:41,221 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:27:41" (1/1) ... [2020-10-24 23:27:41,226 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:27:41" (1/1) ... [2020-10-24 23:27:41,227 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:27:41" (1/1) ... [2020-10-24 23:27:41,230 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-24 23:27:41,231 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-24 23:27:41,231 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-24 23:27:41,232 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-24 23:27:41,233 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:27:41" (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 [2020-10-24 23:27:41,322 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-10-24 23:27:41,322 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-24 23:27:41,322 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-24 23:27:41,324 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-24 23:27:41,716 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-24 23:27:41,716 INFO L298 CfgBuilder]: Removed 11 assume(true) statements. [2020-10-24 23:27:41,718 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 11:27:41 BoogieIcfgContainer [2020-10-24 23:27:41,718 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-24 23:27:41,720 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-24 23:27:41,721 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-24 23:27:41,724 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-24 23:27:41,725 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.10 11:27:40" (1/3) ... [2020-10-24 23:27:41,726 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@e12594 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 11:27:41, skipping insertion in model container [2020-10-24 23:27:41,726 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:27:41" (2/3) ... [2020-10-24 23:27:41,727 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@e12594 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 11:27:41, skipping insertion in model container [2020-10-24 23:27:41,727 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 11:27:41" (3/3) ... [2020-10-24 23:27:41,729 INFO L111 eAbstractionObserver]: Analyzing ICFG loop2-1.c [2020-10-24 23:27:41,745 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-10-24 23:27:41,752 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-24 23:27:41,771 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-24 23:27:41,804 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-10-24 23:27:41,805 INFO L378 AbstractCegarLoop]: Hoare is true [2020-10-24 23:27:41,805 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-10-24 23:27:41,805 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-24 23:27:41,805 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-24 23:27:41,806 INFO L382 AbstractCegarLoop]: Difference is false [2020-10-24 23:27:41,806 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-24 23:27:41,806 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-24 23:27:41,841 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-10-24 23:27:41,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2020-10-24 23:27:41,858 INFO L414 BasicCegarLoop]: Found error trace [2020-10-24 23:27:41,859 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2020-10-24 23:27:41,859 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-24 23:27:41,869 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-24 23:27:41,869 INFO L82 PathProgramCache]: Analyzing trace with hash 119997515, now seen corresponding path program 1 times [2020-10-24 23:27:41,881 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-24 23:27:41,882 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1533353000] [2020-10-24 23:27:41,883 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-24 23:27:42,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 23:27:42,111 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-24 23:27:42,112 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1533353000] [2020-10-24 23:27:42,114 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-24 23:27:42,114 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-10-24 23:27:42,115 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [855230036] [2020-10-24 23:27:42,121 INFO L461 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-10-24 23:27:42,122 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-24 23:27:42,143 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-10-24 23:27:42,145 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-10-24 23:27:42,147 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 2 states. [2020-10-24 23:27:42,168 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-24 23:27:42,169 INFO L93 Difference]: Finished difference Result 30 states and 39 transitions. [2020-10-24 23:27:42,170 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-10-24 23:27:42,171 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 8 [2020-10-24 23:27:42,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-24 23:27:42,186 INFO L225 Difference]: With dead ends: 30 [2020-10-24 23:27:42,187 INFO L226 Difference]: Without dead ends: 12 [2020-10-24 23:27:42,199 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 [2020-10-24 23:27:42,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-10-24 23:27:42,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-10-24 23:27:42,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-10-24 23:27:42,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 13 transitions. [2020-10-24 23:27:42,244 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 13 transitions. Word has length 8 [2020-10-24 23:27:42,244 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-24 23:27:42,245 INFO L481 AbstractCegarLoop]: Abstraction has 12 states and 13 transitions. [2020-10-24 23:27:42,245 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-10-24 23:27:42,245 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 13 transitions. [2020-10-24 23:27:42,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-10-24 23:27:42,246 INFO L414 BasicCegarLoop]: Found error trace [2020-10-24 23:27:42,246 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-24 23:27:42,247 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-24 23:27:42,247 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-24 23:27:42,248 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-24 23:27:42,248 INFO L82 PathProgramCache]: Analyzing trace with hash -2105434535, now seen corresponding path program 1 times [2020-10-24 23:27:42,248 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-24 23:27:42,249 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [302797895] [2020-10-24 23:27:42,249 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-24 23:27:42,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 23:27:42,333 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-24 23:27:42,334 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [302797895] [2020-10-24 23:27:42,334 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-24 23:27:42,334 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-10-24 23:27:42,335 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [346025769] [2020-10-24 23:27:42,336 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-10-24 23:27:42,336 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-24 23:27:42,338 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-10-24 23:27:42,338 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-10-24 23:27:42,339 INFO L87 Difference]: Start difference. First operand 12 states and 13 transitions. Second operand 3 states. [2020-10-24 23:27:42,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-24 23:27:42,369 INFO L93 Difference]: Finished difference Result 23 states and 26 transitions. [2020-10-24 23:27:42,370 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-10-24 23:27:42,370 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2020-10-24 23:27:42,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-24 23:27:42,371 INFO L225 Difference]: With dead ends: 23 [2020-10-24 23:27:42,372 INFO L226 Difference]: Without dead ends: 15 [2020-10-24 23:27:42,373 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-10-24 23:27:42,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-10-24 23:27:42,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 14. [2020-10-24 23:27:42,377 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-10-24 23:27:42,378 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2020-10-24 23:27:42,378 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 11 [2020-10-24 23:27:42,378 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-24 23:27:42,378 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2020-10-24 23:27:42,379 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-10-24 23:27:42,379 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2020-10-24 23:27:42,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-10-24 23:27:42,380 INFO L414 BasicCegarLoop]: Found error trace [2020-10-24 23:27:42,380 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-24 23:27:42,380 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-24 23:27:42,381 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-24 23:27:42,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-24 23:27:42,382 INFO L82 PathProgramCache]: Analyzing trace with hash -2048176233, now seen corresponding path program 1 times [2020-10-24 23:27:42,382 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-24 23:27:42,382 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1039150041] [2020-10-24 23:27:42,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-24 23:27:42,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-24 23:27:42,407 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-24 23:27:42,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-24 23:27:42,470 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-24 23:27:42,511 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-24 23:27:42,512 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-10-24 23:27:42,513 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-10-24 23:27:42,556 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 24.10 11:27:42 BoogieIcfgContainer [2020-10-24 23:27:42,556 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-10-24 23:27:42,557 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-10-24 23:27:42,557 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-10-24 23:27:42,557 INFO L275 PluginConnector]: Witness Printer initialized [2020-10-24 23:27:42,558 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 11:27:41" (3/4) ... [2020-10-24 23:27:42,562 INFO L140 WitnessPrinter]: No result that supports witness generation found [2020-10-24 23:27:42,563 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-10-24 23:27:42,565 INFO L168 Benchmark]: Toolchain (without parser) took 1713.51 ms. Allocated memory was 44.0 MB in the beginning and 54.5 MB in the end (delta: 10.5 MB). Free memory was 21.2 MB in the beginning and 34.2 MB in the end (delta: -12.9 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-10-24 23:27:42,566 INFO L168 Benchmark]: CDTParser took 0.32 ms. Allocated memory is still 33.6 MB. Free memory was 16.2 MB in the beginning and 16.2 MB in the end (delta: 42.0 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-10-24 23:27:42,567 INFO L168 Benchmark]: CACSL2BoogieTranslator took 291.61 ms. Allocated memory is still 44.0 MB. Free memory was 20.6 MB in the beginning and 20.1 MB in the end (delta: 521.9 kB). Peak memory consumption was 3.2 MB. Max. memory is 16.1 GB. [2020-10-24 23:27:42,568 INFO L168 Benchmark]: Boogie Procedure Inliner took 49.71 ms. Allocated memory is still 44.0 MB. Free memory was 20.1 MB in the beginning and 28.4 MB in the end (delta: -8.3 MB). Peak memory consumption was 4.8 MB. Max. memory is 16.1 GB. [2020-10-24 23:27:42,569 INFO L168 Benchmark]: Boogie Preprocessor took 27.61 ms. Allocated memory is still 44.0 MB. Free memory was 28.4 MB in the beginning and 27.3 MB in the end (delta: 1.2 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-10-24 23:27:42,570 INFO L168 Benchmark]: RCFGBuilder took 487.47 ms. Allocated memory is still 44.0 MB. Free memory was 27.3 MB in the beginning and 24.8 MB in the end (delta: 2.4 MB). Peak memory consumption was 11.3 MB. Max. memory is 16.1 GB. [2020-10-24 23:27:42,571 INFO L168 Benchmark]: TraceAbstraction took 835.90 ms. Allocated memory was 44.0 MB in the beginning and 54.5 MB in the end (delta: 10.5 MB). Free memory was 24.3 MB in the beginning and 34.5 MB in the end (delta: -10.1 MB). Peak memory consumption was 1.0 MB. Max. memory is 16.1 GB. [2020-10-24 23:27:42,572 INFO L168 Benchmark]: Witness Printer took 5.88 ms. Allocated memory is still 54.5 MB. Free memory was 34.5 MB in the beginning and 34.2 MB in the end (delta: 309.1 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-10-24 23:27:42,577 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.32 ms. Allocated memory is still 33.6 MB. Free memory was 16.2 MB in the beginning and 16.2 MB in the end (delta: 42.0 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 291.61 ms. Allocated memory is still 44.0 MB. Free memory was 20.6 MB in the beginning and 20.1 MB in the end (delta: 521.9 kB). Peak memory consumption was 3.2 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 49.71 ms. Allocated memory is still 44.0 MB. Free memory was 20.1 MB in the beginning and 28.4 MB in the end (delta: -8.3 MB). Peak memory consumption was 4.8 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 27.61 ms. Allocated memory is still 44.0 MB. Free memory was 28.4 MB in the beginning and 27.3 MB in the end (delta: 1.2 MB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 487.47 ms. Allocated memory is still 44.0 MB. Free memory was 27.3 MB in the beginning and 24.8 MB in the end (delta: 2.4 MB). Peak memory consumption was 11.3 MB. Max. memory is 16.1 GB. * TraceAbstraction took 835.90 ms. Allocated memory was 44.0 MB in the beginning and 54.5 MB in the end (delta: 10.5 MB). Free memory was 24.3 MB in the beginning and 34.5 MB in the end (delta: -10.1 MB). Peak memory consumption was 1.0 MB. Max. memory is 16.1 GB. * Witness Printer took 5.88 ms. Allocated memory is still 54.5 MB. Free memory was 34.5 MB in the beginning and 34.2 MB in the end (delta: 309.1 kB). There was no memory consumed. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - UnprovableResult [Line: 7]: Unable to prove that call of __VERIFIER_error() unreachable Unable to prove that call of __VERIFIER_error() unreachable Reason: overapproximation of someBinaryFLOATComparisonOperation at line 49, overapproximation of someBinaryArithmeticFLOAToperation at line 35. Possible FailurePath: [L14] float pi = 3.14159 ; VAL [pi=314159/100000] [L20] float x = __VERIFIER_nondet_float() ; [L21] float octant = pi/3 ; [L10] COND FALSE !(!cond) VAL [pi=314159/100000] [L23] float oddExp = x ; [L24] float evenExp = 1.0 ; [L25] float term = x ; [L26] unsigned int count = 2 ; [L27] int multFactor = 0 ; [L28] int temp ; VAL [pi=314159/100000] [L30] COND TRUE 1 [L32] term = term * (x/count) VAL [pi=314159/100000] [L33] EXPR (count>>1 % 2 == 0) ? 1 : -1 VAL [pi=314159/100000] [L33] multFactor = (count>>1 % 2 == 0) ? 1 : -1 [L35] evenExp = evenExp + multFactor*term [L37] count++ [L39] term = term * (x/count) [L41] oddExp = oddExp + multFactor*term [L43] count++ [L45] temp = __VERIFIER_nondet_int() [L46] COND TRUE temp == 0 VAL [pi=314159/100000] [L12] COND TRUE !(cond) VAL [pi=314159/100000] [L7] __assert_fail("0", "loop2-1.c", 7, "reach_error") VAL [pi=314159/100000] - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 17 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 0.7s, OverallIterations: 3, TraceHistogramMax: 1, AutomataDifference: 0.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 28 SDtfs, 1 SDslu, 8 SDs, 0 SdLazy, 6 SolverSat, 0 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s 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, 1 StatesRemovedByMinimization, 1 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.1s InterpolantComputationTime, 30 NumberOfCodeBlocks, 30 NumberOfCodeBlocksAsserted, 3 NumberOfCheckSat, 17 ConstructedInterpolants, 0 QuantifiedInterpolants, 189 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 could not prove your program: unable to determine feasibility of some traces Received shutdown request... ### Bit-precise run ### This is Ultimate 0.2.0-a4ecdab [2020-10-24 23:27:45,138 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-24 23:27:45,141 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-24 23:27:45,183 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-24 23:27:45,184 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-24 23:27:45,186 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-24 23:27:45,188 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-24 23:27:45,190 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-24 23:27:45,192 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-24 23:27:45,194 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-24 23:27:45,195 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-24 23:27:45,197 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-24 23:27:45,197 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-24 23:27:45,199 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-24 23:27:45,200 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-24 23:27:45,202 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-24 23:27:45,203 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-24 23:27:45,211 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-24 23:27:45,214 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-24 23:27:45,216 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-24 23:27:45,221 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-24 23:27:45,225 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-24 23:27:45,227 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-24 23:27:45,229 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-24 23:27:45,239 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-10-24 23:27:45,239 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-10-24 23:27:45,241 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-10-24 23:27:45,242 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-10-24 23:27:45,244 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-10-24 23:27:45,248 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-10-24 23:27:45,249 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-10-24 23:27:45,251 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-10-24 23:27:45,252 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-10-24 23:27:45,254 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-10-24 23:27:45,256 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-10-24 23:27:45,257 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-10-24 23:27:45,258 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-10-24 23:27:45,258 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-10-24 23:27:45,258 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-24 23:27:45,259 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-24 23:27:45,261 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-24 23:27:45,265 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Bitvector.epf [2020-10-24 23:27:45,317 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-24 23:27:45,318 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-24 23:27:45,320 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-24 23:27:45,321 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-24 23:27:45,321 INFO L138 SettingsManager]: * Use SBE=true [2020-10-24 23:27:45,322 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-24 23:27:45,322 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-24 23:27:45,322 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-24 23:27:45,322 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-24 23:27:45,323 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-24 23:27:45,324 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-24 23:27:45,324 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-24 23:27:45,324 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2020-10-24 23:27:45,325 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2020-10-24 23:27:45,325 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-24 23:27:45,325 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-24 23:27:45,325 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-24 23:27:45,326 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-24 23:27:45,326 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-24 23:27:45,326 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-24 23:27:45,327 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-24 23:27:45,327 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-24 23:27:45,327 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-24 23:27:45,327 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-24 23:27:45,328 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-10-24 23:27:45,328 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-10-24 23:27:45,328 INFO L138 SettingsManager]: * Trace refinement strategy=WOLF [2020-10-24 23:27:45,328 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --rewrite-divk --print-success --lang smt [2020-10-24 23:27:45,329 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-24 23:27:45,329 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-24 23:27:45,329 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-10-24 23:27:45,329 INFO L138 SettingsManager]: * Logic for external solver=AUFBV WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 02e16371708027ec56fdf0402c3e1a5d4f23a0ff [2020-10-24 23:27:45,775 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-24 23:27:45,816 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-24 23:27:45,823 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-24 23:27:45,825 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-24 23:27:45,825 INFO L275 PluginConnector]: CDTParser initialized [2020-10-24 23:27:45,827 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loop-floats-scientific-comp/loop2-1.c [2020-10-24 23:27:45,911 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/32b849c27/e3995a9d40a147958bfaf725774398bd/FLAG49606a411 [2020-10-24 23:27:46,607 INFO L306 CDTParser]: Found 1 translation units. [2020-10-24 23:27:46,608 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loop-floats-scientific-comp/loop2-1.c [2020-10-24 23:27:46,618 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/32b849c27/e3995a9d40a147958bfaf725774398bd/FLAG49606a411 [2020-10-24 23:27:46,934 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/32b849c27/e3995a9d40a147958bfaf725774398bd [2020-10-24 23:27:46,942 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-24 23:27:46,952 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-10-24 23:27:46,957 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-24 23:27:46,958 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-24 23:27:46,962 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-24 23:27:46,964 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 11:27:46" (1/1) ... [2020-10-24 23:27:46,969 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3cd5e790 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:27:46, skipping insertion in model container [2020-10-24 23:27:46,970 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 11:27:46" (1/1) ... [2020-10-24 23:27:46,979 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-24 23:27:46,999 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-24 23:27:47,210 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-24 23:27:47,227 INFO L203 MainTranslator]: Completed pre-run [2020-10-24 23:27:47,250 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-24 23:27:47,268 INFO L208 MainTranslator]: Completed translation [2020-10-24 23:27:47,269 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:27:47 WrapperNode [2020-10-24 23:27:47,269 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-24 23:27:47,271 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-10-24 23:27:47,271 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-10-24 23:27:47,271 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-10-24 23:27:47,284 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:27:47" (1/1) ... [2020-10-24 23:27:47,296 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:27:47" (1/1) ... [2020-10-24 23:27:47,318 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-10-24 23:27:47,319 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-24 23:27:47,319 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-24 23:27:47,320 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-24 23:27:47,329 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:27:47" (1/1) ... [2020-10-24 23:27:47,329 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:27:47" (1/1) ... [2020-10-24 23:27:47,333 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:27:47" (1/1) ... [2020-10-24 23:27:47,334 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:27:47" (1/1) ... [2020-10-24 23:27:47,342 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:27:47" (1/1) ... [2020-10-24 23:27:47,347 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:27:47" (1/1) ... [2020-10-24 23:27:47,350 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:27:47" (1/1) ... [2020-10-24 23:27:47,354 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-24 23:27:47,355 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-24 23:27:47,355 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-24 23:27:47,355 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-24 23:27:47,356 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:27:47" (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 [2020-10-24 23:27:47,443 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2020-10-24 23:27:47,444 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-24 23:27:47,444 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-24 23:27:47,444 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-24 23:27:52,657 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-24 23:27:52,658 INFO L298 CfgBuilder]: Removed 11 assume(true) statements. [2020-10-24 23:27:52,660 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 11:27:52 BoogieIcfgContainer [2020-10-24 23:27:52,660 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-24 23:27:52,662 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-24 23:27:52,662 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-24 23:27:52,666 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-24 23:27:52,671 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.10 11:27:46" (1/3) ... [2020-10-24 23:27:52,672 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5d274bb3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 11:27:52, skipping insertion in model container [2020-10-24 23:27:52,673 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 11:27:47" (2/3) ... [2020-10-24 23:27:52,673 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5d274bb3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 11:27:52, skipping insertion in model container [2020-10-24 23:27:52,673 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 11:27:52" (3/3) ... [2020-10-24 23:27:52,675 INFO L111 eAbstractionObserver]: Analyzing ICFG loop2-1.c [2020-10-24 23:27:52,689 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-10-24 23:27:52,694 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-24 23:27:52,709 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-24 23:27:52,740 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-10-24 23:27:52,740 INFO L378 AbstractCegarLoop]: Hoare is true [2020-10-24 23:27:52,741 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-10-24 23:27:52,741 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-24 23:27:52,741 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-24 23:27:52,741 INFO L382 AbstractCegarLoop]: Difference is false [2020-10-24 23:27:52,742 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-24 23:27:52,742 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-24 23:27:52,757 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-10-24 23:27:52,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2020-10-24 23:27:52,764 INFO L414 BasicCegarLoop]: Found error trace [2020-10-24 23:27:52,765 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2020-10-24 23:27:52,766 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-24 23:27:52,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-24 23:27:52,773 INFO L82 PathProgramCache]: Analyzing trace with hash 119997515, now seen corresponding path program 1 times [2020-10-24 23:27:52,789 INFO L162 FreeRefinementEngine]: Executing refinement strategy WOLF [2020-10-24 23:27:52,789 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [796452048] [2020-10-24 23:27:52,790 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat Starting monitored process 2 with mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with mathsat -unsat_core_generation=3 [2020-10-24 23:27:52,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 23:27:53,000 INFO L263 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 1 conjunts are in the unsatisfiable core [2020-10-24 23:27:53,006 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-24 23:27:53,026 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-24 23:27:53,027 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-10-24 23:27:53,031 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-24 23:27:53,033 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [796452048] [2020-10-24 23:27:53,033 INFO L219 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2020-10-24 23:27:53,034 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2020-10-24 23:27:53,035 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [247035895] [2020-10-24 23:27:53,040 INFO L461 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-10-24 23:27:53,041 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2020-10-24 23:27:53,057 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-10-24 23:27:53,059 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-10-24 23:27:53,061 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 2 states. [2020-10-24 23:27:53,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-24 23:27:53,081 INFO L93 Difference]: Finished difference Result 30 states and 39 transitions. [2020-10-24 23:27:53,081 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-10-24 23:27:53,083 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 8 [2020-10-24 23:27:53,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-24 23:27:53,098 INFO L225 Difference]: With dead ends: 30 [2020-10-24 23:27:53,098 INFO L226 Difference]: Without dead ends: 12 [2020-10-24 23:27:53,101 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-10-24 23:27:53,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-10-24 23:27:53,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-10-24 23:27:53,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-10-24 23:27:53,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 13 transitions. [2020-10-24 23:27:53,138 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 13 transitions. Word has length 8 [2020-10-24 23:27:53,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-24 23:27:53,139 INFO L481 AbstractCegarLoop]: Abstraction has 12 states and 13 transitions. [2020-10-24 23:27:53,139 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-10-24 23:27:53,139 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 13 transitions. [2020-10-24 23:27:53,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-10-24 23:27:53,140 INFO L414 BasicCegarLoop]: Found error trace [2020-10-24 23:27:53,140 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-24 23:27:53,354 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 mathsat -unsat_core_generation=3 [2020-10-24 23:27:53,354 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-24 23:27:53,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-24 23:27:53,358 INFO L82 PathProgramCache]: Analyzing trace with hash -2105434535, now seen corresponding path program 1 times [2020-10-24 23:27:53,359 INFO L162 FreeRefinementEngine]: Executing refinement strategy WOLF [2020-10-24 23:27:53,361 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2122413118] [2020-10-24 23:27:53,362 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat Starting monitored process 3 with mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with mathsat -unsat_core_generation=3 [2020-10-24 23:27:54,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 23:27:54,169 INFO L263 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 2 conjunts are in the unsatisfiable core [2020-10-24 23:27:54,171 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-24 23:27:54,196 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-24 23:27:54,197 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-10-24 23:27:54,216 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-24 23:27:54,216 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2122413118] [2020-10-24 23:27:54,216 INFO L219 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2020-10-24 23:27:54,217 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2020-10-24 23:27:54,217 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1187450776] [2020-10-24 23:27:54,219 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-24 23:27:54,219 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2020-10-24 23:27:54,220 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-24 23:27:54,221 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-10-24 23:27:54,221 INFO L87 Difference]: Start difference. First operand 12 states and 13 transitions. Second operand 4 states. [2020-10-24 23:28:00,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-24 23:28:00,137 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2020-10-24 23:28:00,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-24 23:28:00,139 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2020-10-24 23:28:00,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-24 23:28:00,139 INFO L225 Difference]: With dead ends: 24 [2020-10-24 23:28:00,139 INFO L226 Difference]: Without dead ends: 16 [2020-10-24 23:28:00,141 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-10-24 23:28:00,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-10-24 23:28:00,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 14. [2020-10-24 23:28:00,147 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-10-24 23:28:00,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2020-10-24 23:28:00,149 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 11 [2020-10-24 23:28:00,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-24 23:28:00,150 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2020-10-24 23:28:00,150 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-24 23:28:00,150 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2020-10-24 23:28:00,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-10-24 23:28:00,151 INFO L414 BasicCegarLoop]: Found error trace [2020-10-24 23:28:00,151 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-24 23:28:00,364 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 mathsat -unsat_core_generation=3 [2020-10-24 23:28:00,365 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-24 23:28:00,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-24 23:28:00,367 INFO L82 PathProgramCache]: Analyzing trace with hash -2048176233, now seen corresponding path program 1 times [2020-10-24 23:28:00,368 INFO L162 FreeRefinementEngine]: Executing refinement strategy WOLF [2020-10-24 23:28:00,368 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2017909302] [2020-10-24 23:28:00,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat Starting monitored process 4 with mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with mathsat -unsat_core_generation=3 [2020-10-24 23:28:01,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-24 23:28:01,216 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-24 23:28:02,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-24 23:28:02,048 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-24 23:28:02,149 INFO L173 FreeRefinementEngine]: Strategy WOLF found a feasible trace [2020-10-24 23:28:02,150 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-10-24 23:28:02,351 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 mathsat -unsat_core_generation=3 [2020-10-24 23:28:02,391 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 24.10 11:28:02 BoogieIcfgContainer [2020-10-24 23:28:02,392 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-10-24 23:28:02,393 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-10-24 23:28:02,393 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-10-24 23:28:02,393 INFO L275 PluginConnector]: Witness Printer initialized [2020-10-24 23:28:02,394 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 11:27:52" (3/4) ... [2020-10-24 23:28:02,396 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-10-24 23:28:02,454 INFO L141 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/witness.graphml [2020-10-24 23:28:02,454 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-10-24 23:28:02,457 INFO L168 Benchmark]: Toolchain (without parser) took 15509.27 ms. Allocated memory was 46.1 MB in the beginning and 56.6 MB in the end (delta: 10.5 MB). Free memory was 23.9 MB in the beginning and 28.5 MB in the end (delta: -4.6 MB). Peak memory consumption was 7.9 MB. Max. memory is 16.1 GB. [2020-10-24 23:28:02,458 INFO L168 Benchmark]: CDTParser took 0.32 ms. Allocated memory is still 46.1 MB. Free memory was 31.5 MB in the beginning and 31.4 MB in the end (delta: 40.0 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-10-24 23:28:02,459 INFO L168 Benchmark]: CACSL2BoogieTranslator took 312.71 ms. Allocated memory is still 46.1 MB. Free memory was 23.2 MB in the beginning and 24.0 MB in the end (delta: -820.0 kB). Peak memory consumption was 5.5 MB. Max. memory is 16.1 GB. [2020-10-24 23:28:02,460 INFO L168 Benchmark]: Boogie Procedure Inliner took 47.35 ms. Allocated memory is still 46.1 MB. Free memory was 23.9 MB in the beginning and 22.3 MB in the end (delta: 1.6 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-10-24 23:28:02,461 INFO L168 Benchmark]: Boogie Preprocessor took 35.02 ms. Allocated memory is still 46.1 MB. Free memory was 22.3 MB in the beginning and 21.0 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-10-24 23:28:02,462 INFO L168 Benchmark]: RCFGBuilder took 5305.60 ms. Allocated memory is still 46.1 MB. Free memory was 21.0 MB in the beginning and 19.4 MB in the end (delta: 1.6 MB). Peak memory consumption was 5.3 MB. Max. memory is 16.1 GB. [2020-10-24 23:28:02,463 INFO L168 Benchmark]: TraceAbstraction took 9729.78 ms. Allocated memory was 46.1 MB in the beginning and 56.6 MB in the end (delta: 10.5 MB). Free memory was 18.9 MB in the beginning and 30.8 MB in the end (delta: -12.0 MB). Peak memory consumption was 1.4 MB. Max. memory is 16.1 GB. [2020-10-24 23:28:02,464 INFO L168 Benchmark]: Witness Printer took 61.98 ms. Allocated memory is still 56.6 MB. Free memory was 30.8 MB in the beginning and 28.5 MB in the end (delta: 2.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-10-24 23:28:02,469 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.32 ms. Allocated memory is still 46.1 MB. Free memory was 31.5 MB in the beginning and 31.4 MB in the end (delta: 40.0 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 312.71 ms. Allocated memory is still 46.1 MB. Free memory was 23.2 MB in the beginning and 24.0 MB in the end (delta: -820.0 kB). Peak memory consumption was 5.5 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 47.35 ms. Allocated memory is still 46.1 MB. Free memory was 23.9 MB in the beginning and 22.3 MB in the end (delta: 1.6 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 35.02 ms. Allocated memory is still 46.1 MB. Free memory was 22.3 MB in the beginning and 21.0 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 5305.60 ms. Allocated memory is still 46.1 MB. Free memory was 21.0 MB in the beginning and 19.4 MB in the end (delta: 1.6 MB). Peak memory consumption was 5.3 MB. Max. memory is 16.1 GB. * TraceAbstraction took 9729.78 ms. Allocated memory was 46.1 MB in the beginning and 56.6 MB in the end (delta: 10.5 MB). Free memory was 18.9 MB in the beginning and 30.8 MB in the end (delta: -12.0 MB). Peak memory consumption was 1.4 MB. Max. memory is 16.1 GB. * Witness Printer took 61.98 ms. Allocated memory is still 56.6 MB. Free memory was 30.8 MB in the beginning and 28.5 MB in the end (delta: 2.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 7]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L14] float pi = 3.14159 ; VAL [pi=3.141590118408203] [L20] float x = __VERIFIER_nondet_float() ; [L21] float octant = pi/3 ; [L10] COND FALSE !(!cond) VAL [pi=3.141590118408203] [L23] float oddExp = x ; [L24] float evenExp = 1.0 ; [L25] float term = x ; [L26] unsigned int count = 2 ; [L27] int multFactor = 0 ; [L28] int temp ; VAL [pi=3.141590118408203] [L30] COND TRUE 1 [L32] term = term * (x/count) VAL [pi=3.141590118408203] [L33] EXPR (count>>1 % 2 == 0) ? 1 : -1 VAL [pi=3.141590118408203] [L33] multFactor = (count>>1 % 2 == 0) ? 1 : -1 [L35] evenExp = evenExp + multFactor*term [L37] count++ [L39] term = term * (x/count) [L41] oddExp = oddExp + multFactor*term [L43] count++ [L45] temp = __VERIFIER_nondet_int() [L46] COND TRUE temp == 0 VAL [pi=3.141590118408203] [L12] COND TRUE !(cond) VAL [pi=3.141590118408203] [L7] __assert_fail("0", "loop2-1.c", 7, "reach_error") VAL [pi=3.141590118408203] - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 17 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 9.6s, OverallIterations: 3, TraceHistogramMax: 1, AutomataDifference: 5.9s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 27 SDtfs, 2 SDslu, 7 SDs, 0 SdLazy, 6 SolverSat, 1 SolverUnsat, 1 SolverUnknown, 0 SolverNotchecked, 5.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 34 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s 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, 2 StatesRemovedByMinimization, 1 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 1.6s SatisfiabilityAnalysisTime, 0.1s InterpolantComputationTime, 30 NumberOfCodeBlocks, 30 NumberOfCodeBlocksAsserted, 3 NumberOfCheckSat, 34 ConstructedInterpolants, 0 QuantifiedInterpolants, 438 SizeOfPredicates, 1 NumberOfNonLiveVariables, 85 ConjunctsInSsa, 3 ConjunctsInUnsatCore, 4 InterpolantComputations, 4 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...