/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerCTransformed.xml -s ../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf -i ../../../trunk/examples/svcomp/loop-acceleration/nested_1-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-7390193 [2022-04-05 00:23:41,747 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-04-05 00:23:41,749 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-04-05 00:23:41,796 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-04-05 00:23:41,796 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-04-05 00:23:41,797 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-04-05 00:23:41,800 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-04-05 00:23:41,801 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-04-05 00:23:41,803 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-04-05 00:23:41,803 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-04-05 00:23:41,804 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-04-05 00:23:41,805 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-04-05 00:23:41,805 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-04-05 00:23:41,806 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-04-05 00:23:41,807 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-04-05 00:23:41,808 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-04-05 00:23:41,808 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-04-05 00:23:41,809 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-04-05 00:23:41,811 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-04-05 00:23:41,818 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-04-05 00:23:41,822 INFO L181 SettingsManager]: Resetting HornVerifier preferences to default values [2022-04-05 00:23:41,826 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-04-05 00:23:41,828 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-04-05 00:23:41,829 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-04-05 00:23:41,831 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-04-05 00:23:41,834 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-04-05 00:23:41,834 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-04-05 00:23:41,835 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-04-05 00:23:41,835 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-04-05 00:23:41,836 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-04-05 00:23:41,836 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-04-05 00:23:41,837 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-04-05 00:23:41,838 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-04-05 00:23:41,838 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-04-05 00:23:41,839 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-04-05 00:23:41,840 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-04-05 00:23:41,840 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-04-05 00:23:41,840 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-04-05 00:23:41,841 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-04-05 00:23:41,841 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-04-05 00:23:41,841 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-04-05 00:23:41,843 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-04-05 00:23:41,844 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2022-04-05 00:23:41,854 INFO L113 SettingsManager]: Loading preferences was successful [2022-04-05 00:23:41,854 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-04-05 00:23:41,855 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-04-05 00:23:41,856 INFO L138 SettingsManager]: * sizeof long=4 [2022-04-05 00:23:41,856 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-04-05 00:23:41,856 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-04-05 00:23:41,856 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-04-05 00:23:41,856 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-04-05 00:23:41,856 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-04-05 00:23:41,857 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-04-05 00:23:41,857 INFO L138 SettingsManager]: * sizeof long double=12 [2022-04-05 00:23:41,857 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-04-05 00:23:41,857 INFO L138 SettingsManager]: * Use constant arrays=true [2022-04-05 00:23:41,857 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-04-05 00:23:41,857 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-04-05 00:23:41,858 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-04-05 00:23:41,858 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-04-05 00:23:41,858 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-04-05 00:23:41,858 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-04-05 00:23:41,858 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-04-05 00:23:41,858 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-04-05 00:23:41,860 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2022-04-05 00:23:41,860 INFO L138 SettingsManager]: * TransformationType=LOOP_ACCELERATION_JORDAN 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-04-05 00:23:42,070 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-04-05 00:23:42,095 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-04-05 00:23:42,097 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-04-05 00:23:42,098 INFO L271 PluginConnector]: Initializing CDTParser... [2022-04-05 00:23:42,099 INFO L275 PluginConnector]: CDTParser initialized [2022-04-05 00:23:42,100 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/nested_1-1.c [2022-04-05 00:23:42,168 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cdbc07781/ec64aa0b6b9143cb8bb03ca86fef0341/FLAGc3baff286 [2022-04-05 00:23:42,519 INFO L306 CDTParser]: Found 1 translation units. [2022-04-05 00:23:42,519 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/nested_1-1.c [2022-04-05 00:23:42,523 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cdbc07781/ec64aa0b6b9143cb8bb03ca86fef0341/FLAGc3baff286 [2022-04-05 00:23:42,959 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cdbc07781/ec64aa0b6b9143cb8bb03ca86fef0341 [2022-04-05 00:23:42,961 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-04-05 00:23:42,963 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2022-04-05 00:23:42,966 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-04-05 00:23:42,966 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-04-05 00:23:42,970 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-04-05 00:23:42,971 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 05.04 12:23:42" (1/1) ... [2022-04-05 00:23:42,972 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@346ffc8a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 12:23:42, skipping insertion in model container [2022-04-05 00:23:42,972 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 05.04 12:23:42" (1/1) ... [2022-04-05 00:23:42,978 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-04-05 00:23:42,991 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-04-05 00:23:43,112 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/nested_1-1.c[322,335] [2022-04-05 00:23:43,143 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-04-05 00:23:43,151 INFO L203 MainTranslator]: Completed pre-run [2022-04-05 00:23:43,161 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/nested_1-1.c[322,335] [2022-04-05 00:23:43,164 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-04-05 00:23:43,175 INFO L208 MainTranslator]: Completed translation [2022-04-05 00:23:43,176 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 12:23:43 WrapperNode [2022-04-05 00:23:43,176 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-04-05 00:23:43,177 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-04-05 00:23:43,177 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-04-05 00:23:43,178 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-04-05 00:23:43,186 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 12:23:43" (1/1) ... [2022-04-05 00:23:43,186 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 12:23:43" (1/1) ... [2022-04-05 00:23:43,191 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 12:23:43" (1/1) ... [2022-04-05 00:23:43,191 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 12:23:43" (1/1) ... [2022-04-05 00:23:43,195 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 12:23:43" (1/1) ... [2022-04-05 00:23:43,199 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 12:23:43" (1/1) ... [2022-04-05 00:23:43,200 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 12:23:43" (1/1) ... [2022-04-05 00:23:43,201 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-04-05 00:23:43,202 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-04-05 00:23:43,202 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-04-05 00:23:43,202 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-04-05 00:23:43,203 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 12:23:43" (1/1) ... [2022-04-05 00:23:43,218 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-04-05 00:23:43,229 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 00:23:43,243 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-04-05 00:23:43,255 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-04-05 00:23:43,277 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-04-05 00:23:43,277 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-04-05 00:23:43,277 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-04-05 00:23:43,277 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-04-05 00:23:43,277 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-04-05 00:23:43,277 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-04-05 00:23:43,277 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-04-05 00:23:43,278 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-04-05 00:23:43,278 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-04-05 00:23:43,278 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-04-05 00:23:43,278 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-04-05 00:23:43,278 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-04-05 00:23:43,278 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-04-05 00:23:43,278 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-04-05 00:23:43,278 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-04-05 00:23:43,279 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-04-05 00:23:43,279 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-04-05 00:23:43,326 INFO L234 CfgBuilder]: Building ICFG [2022-04-05 00:23:43,328 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-04-05 00:23:43,417 INFO L275 CfgBuilder]: Performing block encoding [2022-04-05 00:23:43,423 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-04-05 00:23:43,424 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2022-04-05 00:23:43,425 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 05.04 12:23:43 BoogieIcfgContainer [2022-04-05 00:23:43,426 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-04-05 00:23:43,426 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2022-04-05 00:23:43,427 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2022-04-05 00:23:43,428 INFO L275 PluginConnector]: IcfgTransformer initialized [2022-04-05 00:23:43,430 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 05.04 12:23:43" (1/1) ... [2022-04-05 00:23:43,438 INFO L168 ansformationObserver]: Applying ICFG transformation LOOP_ACCELERATION_JORDAN [2022-04-05 00:23:43,709 INFO L89 elerationTransformer]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-04-05 00:23:43,710 INFO L91 elerationTransformer]: Accelerated Formula: (and (< (mod v_main_~y~0_5 4294967296) 10) (= v_main_~y~0_4 (+ v_main_~y~0_5 1))) InVars {main_~y~0=v_main_~y~0_5} OutVars{main_#t~post4=|v_main_#t~post4_1|, main_~y~0=v_main_~y~0_4} AuxVars[] AssignedVars[main_#t~post4, main_~y~0] to Formula: (let ((.cse0 (mod v_main_~y~0_5 4294967296))) (or (and (= v_main_~y~0_4 v_main_~y~0_5) (<= 10 .cse0) (= |v_main_#t~post4_3| |v_main_#t~post4_1|)) (and (< v_main_~y~0_5 v_main_~y~0_4) (<= (div (+ (* (- 1) v_main_~y~0_4) 10) (- 4294967296)) (+ (div (+ v_main_~y~0_5 (- 4294967295)) 4294967296) 1)) (< .cse0 10)))) InVars {main_#t~post4=|v_main_#t~post4_3|, main_~y~0=v_main_~y~0_5} OutVars{main_#t~post4=|v_main_#t~post4_1|, main_~y~0=v_main_~y~0_4} AuxVars[] AssignedVars[main_#t~post4, main_~y~0] [2022-04-05 00:23:43,716 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 05.04 12:23:43 BasicIcfg [2022-04-05 00:23:43,716 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2022-04-05 00:23:43,718 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-04-05 00:23:43,719 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-04-05 00:23:43,727 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-04-05 00:23:43,727 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 05.04 12:23:42" (1/4) ... [2022-04-05 00:23:43,728 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@35049532 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 05.04 12:23:43, skipping insertion in model container [2022-04-05 00:23:43,728 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 12:23:43" (2/4) ... [2022-04-05 00:23:43,728 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@35049532 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 05.04 12:23:43, skipping insertion in model container [2022-04-05 00:23:43,728 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 05.04 12:23:43" (3/4) ... [2022-04-05 00:23:43,728 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@35049532 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 05.04 12:23:43, skipping insertion in model container [2022-04-05 00:23:43,729 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 05.04 12:23:43" (4/4) ... [2022-04-05 00:23:43,730 INFO L111 eAbstractionObserver]: Analyzing ICFG nested_1-1.cJordan [2022-04-05 00:23:43,734 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2022-04-05 00:23:43,735 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-04-05 00:23:43,767 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-04-05 00:23:43,773 INFO L340 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=ForwardPredicates, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP [2022-04-05 00:23:43,773 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-04-05 00:23:43,787 INFO L276 IsEmpty]: Start isEmpty. Operand has 20 states, 12 states have (on average 1.5) internal successors, (18), 13 states have internal predecessors, (18), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-04-05 00:23:43,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-04-05 00:23:43,793 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 00:23:43,793 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 00:23:43,793 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 00:23:43,798 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 00:23:43,798 INFO L85 PathProgramCache]: Analyzing trace with hash -962721461, now seen corresponding path program 1 times [2022-04-05 00:23:43,805 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 00:23:43,806 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [822413339] [2022-04-05 00:23:43,806 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 00:23:43,807 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 00:23:43,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 00:23:43,952 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 00:23:43,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 00:23:43,984 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-05 00:23:43,984 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 00:23:43,985 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [822413339] [2022-04-05 00:23:43,986 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [822413339] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-05 00:23:43,986 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-05 00:23:43,986 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-04-05 00:23:43,987 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1668661456] [2022-04-05 00:23:43,988 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-05 00:23:43,992 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-04-05 00:23:43,993 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 00:23:44,030 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-04-05 00:23:44,031 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-04-05 00:23:44,033 INFO L87 Difference]: Start difference. First operand has 20 states, 12 states have (on average 1.5) internal successors, (18), 13 states have internal predecessors, (18), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 00:23:44,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 00:23:44,093 INFO L93 Difference]: Finished difference Result 20 states and 21 transitions. [2022-04-05 00:23:44,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-04-05 00:23:44,098 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2022-04-05 00:23:44,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 00:23:44,106 INFO L225 Difference]: With dead ends: 20 [2022-04-05 00:23:44,107 INFO L226 Difference]: Without dead ends: 14 [2022-04-05 00:23:44,108 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-04-05 00:23:44,115 INFO L913 BasicCegarLoop]: 20 mSDtfsCounter, 12 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-05 00:23:44,118 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 23 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-05 00:23:44,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2022-04-05 00:23:44,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2022-04-05 00:23:44,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 00:23:44,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2022-04-05 00:23:44,148 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 11 [2022-04-05 00:23:44,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 00:23:44,149 INFO L478 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2022-04-05 00:23:44,149 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 00:23:44,149 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2022-04-05 00:23:44,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-04-05 00:23:44,151 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 00:23:44,151 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 00:23:44,151 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-04-05 00:23:44,151 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 00:23:44,154 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 00:23:44,154 INFO L85 PathProgramCache]: Analyzing trace with hash -961797940, now seen corresponding path program 1 times [2022-04-05 00:23:44,154 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 00:23:44,154 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [26550967] [2022-04-05 00:23:44,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 00:23:44,155 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 00:23:44,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 00:23:44,251 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 00:23:44,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 00:23:44,264 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-05 00:23:44,264 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 00:23:44,264 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [26550967] [2022-04-05 00:23:44,265 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [26550967] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-05 00:23:44,265 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-05 00:23:44,265 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-04-05 00:23:44,265 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [18447350] [2022-04-05 00:23:44,265 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-05 00:23:44,266 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-04-05 00:23:44,266 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 00:23:44,267 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-04-05 00:23:44,267 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-04-05 00:23:44,267 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 00:23:44,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 00:23:44,312 INFO L93 Difference]: Finished difference Result 17 states and 19 transitions. [2022-04-05 00:23:44,313 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-04-05 00:23:44,314 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2022-04-05 00:23:44,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 00:23:44,315 INFO L225 Difference]: With dead ends: 17 [2022-04-05 00:23:44,315 INFO L226 Difference]: Without dead ends: 17 [2022-04-05 00:23:44,318 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-04-05 00:23:44,320 INFO L913 BasicCegarLoop]: 13 mSDtfsCounter, 15 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-05 00:23:44,320 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 20 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-05 00:23:44,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-04-05 00:23:44,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 15. [2022-04-05 00:23:44,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 00:23:44,324 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2022-04-05 00:23:44,324 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 11 [2022-04-05 00:23:44,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 00:23:44,324 INFO L478 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2022-04-05 00:23:44,324 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 00:23:44,324 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2022-04-05 00:23:44,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-04-05 00:23:44,325 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 00:23:44,325 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 00:23:44,325 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-04-05 00:23:44,325 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 00:23:44,326 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 00:23:44,326 INFO L85 PathProgramCache]: Analyzing trace with hash -1952633576, now seen corresponding path program 1 times [2022-04-05 00:23:44,326 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 00:23:44,326 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [508231651] [2022-04-05 00:23:44,326 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 00:23:44,327 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 00:23:44,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 00:23:44,395 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 00:23:44,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 00:23:44,421 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-05 00:23:44,421 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 00:23:44,421 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [508231651] [2022-04-05 00:23:44,421 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [508231651] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-05 00:23:44,421 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-05 00:23:44,421 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-04-05 00:23:44,422 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1180791923] [2022-04-05 00:23:44,422 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-05 00:23:44,422 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-04-05 00:23:44,422 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 00:23:44,422 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-04-05 00:23:44,423 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-04-05 00:23:44,423 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 00:23:44,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 00:23:44,450 INFO L93 Difference]: Finished difference Result 16 states and 17 transitions. [2022-04-05 00:23:44,451 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-04-05 00:23:44,452 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2022-04-05 00:23:44,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 00:23:44,454 INFO L225 Difference]: With dead ends: 16 [2022-04-05 00:23:44,454 INFO L226 Difference]: Without dead ends: 16 [2022-04-05 00:23:44,455 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-04-05 00:23:44,456 INFO L913 BasicCegarLoop]: 14 mSDtfsCounter, 10 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-05 00:23:44,456 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 21 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 10 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-05 00:23:44,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2022-04-05 00:23:44,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2022-04-05 00:23:44,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 00:23:44,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2022-04-05 00:23:44,459 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 14 [2022-04-05 00:23:44,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 00:23:44,460 INFO L478 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2022-04-05 00:23:44,460 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 00:23:44,460 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2022-04-05 00:23:44,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-04-05 00:23:44,460 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 00:23:44,460 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 00:23:44,461 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-04-05 00:23:44,461 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 00:23:44,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 00:23:44,461 INFO L85 PathProgramCache]: Analyzing trace with hash -1982267804, now seen corresponding path program 1 times [2022-04-05 00:23:44,462 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 00:23:44,462 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1009454223] [2022-04-05 00:23:44,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 00:23:44,462 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 00:23:44,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 00:23:44,521 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 00:23:44,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 00:23:44,527 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-04-05 00:23:44,527 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 00:23:44,527 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1009454223] [2022-04-05 00:23:44,527 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1009454223] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-05 00:23:44,528 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1331723223] [2022-04-05 00:23:44,528 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 00:23:44,528 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 00:23:44,528 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 00:23:44,530 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-05 00:23:44,531 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-04-05 00:23:44,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 00:23:44,576 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 5 conjunts are in the unsatisfiable core [2022-04-05 00:23:44,582 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-05 00:23:44,647 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-04-05 00:23:44,647 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-05 00:23:44,699 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-04-05 00:23:44,699 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1331723223] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-05 00:23:44,699 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-05 00:23:44,699 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 8 [2022-04-05 00:23:44,700 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1912396339] [2022-04-05 00:23:44,700 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-05 00:23:44,700 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-04-05 00:23:44,700 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 00:23:44,701 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-04-05 00:23:44,701 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2022-04-05 00:23:44,701 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand has 8 states, 8 states have (on average 2.5) internal successors, (20), 7 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 00:23:44,815 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 00:23:44,815 INFO L93 Difference]: Finished difference Result 28 states and 32 transitions. [2022-04-05 00:23:44,816 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-04-05 00:23:44,816 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.5) internal successors, (20), 7 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2022-04-05 00:23:44,816 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 00:23:44,818 INFO L225 Difference]: With dead ends: 28 [2022-04-05 00:23:44,818 INFO L226 Difference]: Without dead ends: 28 [2022-04-05 00:23:44,820 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=83, Unknown=0, NotChecked=0, Total=132 [2022-04-05 00:23:44,828 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 33 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-05 00:23:44,829 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 37 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-05 00:23:44,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2022-04-05 00:23:44,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2022-04-05 00:23:44,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 23 states have (on average 1.2173913043478262) internal successors, (28), 23 states have internal predecessors, (28), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 00:23:44,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2022-04-05 00:23:44,833 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 15 [2022-04-05 00:23:44,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 00:23:44,833 INFO L478 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2022-04-05 00:23:44,833 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.5) internal successors, (20), 7 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 00:23:44,834 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2022-04-05 00:23:44,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-04-05 00:23:44,834 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 00:23:44,834 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 00:23:44,870 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-04-05 00:23:45,047 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 00:23:45,048 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 00:23:45,048 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 00:23:45,049 INFO L85 PathProgramCache]: Analyzing trace with hash 417615660, now seen corresponding path program 2 times [2022-04-05 00:23:45,049 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 00:23:45,049 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1026915282] [2022-04-05 00:23:45,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 00:23:45,049 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 00:23:45,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 00:23:45,235 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 00:23:45,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 00:23:45,247 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-04-05 00:23:45,247 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 00:23:45,247 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1026915282] [2022-04-05 00:23:45,247 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1026915282] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-05 00:23:45,247 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1213152314] [2022-04-05 00:23:45,248 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-05 00:23:45,248 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 00:23:45,248 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 00:23:45,249 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-05 00:23:45,250 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-04-05 00:23:45,324 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-05 00:23:45,324 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-05 00:23:45,325 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 11 conjunts are in the unsatisfiable core [2022-04-05 00:23:45,327 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-05 00:23:45,443 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-04-05 00:23:45,443 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-05 00:23:45,601 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-04-05 00:23:45,601 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1213152314] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-05 00:23:45,602 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-05 00:23:45,602 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 14 [2022-04-05 00:23:45,602 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1471990106] [2022-04-05 00:23:45,602 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-05 00:23:45,602 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-04-05 00:23:45,603 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 00:23:45,603 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-04-05 00:23:45,603 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=122, Unknown=0, NotChecked=0, Total=182 [2022-04-05 00:23:45,603 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand has 14 states, 14 states have (on average 3.142857142857143) internal successors, (44), 13 states have internal predecessors, (44), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 00:23:46,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 00:23:46,434 INFO L93 Difference]: Finished difference Result 52 states and 62 transitions. [2022-04-05 00:23:46,434 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-04-05 00:23:46,434 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.142857142857143) internal successors, (44), 13 states have internal predecessors, (44), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 27 [2022-04-05 00:23:46,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 00:23:46,435 INFO L225 Difference]: With dead ends: 52 [2022-04-05 00:23:46,435 INFO L226 Difference]: Without dead ends: 52 [2022-04-05 00:23:46,436 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 50 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=175, Invalid=377, Unknown=0, NotChecked=0, Total=552 [2022-04-05 00:23:46,436 INFO L913 BasicCegarLoop]: 21 mSDtfsCounter, 69 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 137 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 157 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 137 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-05 00:23:46,436 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 48 Invalid, 157 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 137 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-05 00:23:46,437 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2022-04-05 00:23:46,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2022-04-05 00:23:46,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 47 states have (on average 1.2340425531914894) internal successors, (58), 47 states have internal predecessors, (58), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 00:23:46,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 62 transitions. [2022-04-05 00:23:46,447 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 62 transitions. Word has length 27 [2022-04-05 00:23:46,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 00:23:46,447 INFO L478 AbstractCegarLoop]: Abstraction has 52 states and 62 transitions. [2022-04-05 00:23:46,447 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.142857142857143) internal successors, (44), 13 states have internal predecessors, (44), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 00:23:46,448 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 62 transitions. [2022-04-05 00:23:46,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-04-05 00:23:46,449 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 00:23:46,449 INFO L499 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 00:23:46,476 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-04-05 00:23:46,649 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 00:23:46,650 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 00:23:46,650 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 00:23:46,650 INFO L85 PathProgramCache]: Analyzing trace with hash -206820164, now seen corresponding path program 3 times [2022-04-05 00:23:46,650 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 00:23:46,650 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1034287353] [2022-04-05 00:23:46,651 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 00:23:46,651 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 00:23:46,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 00:23:46,888 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 00:23:46,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 00:23:46,896 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 0 proven. 280 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-04-05 00:23:46,896 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 00:23:46,896 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1034287353] [2022-04-05 00:23:46,896 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1034287353] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-05 00:23:46,896 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1388031523] [2022-04-05 00:23:46,896 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-04-05 00:23:46,897 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 00:23:46,897 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 00:23:46,898 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-05 00:23:46,911 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-04-05 00:23:47,010 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-04-05 00:23:47,010 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-05 00:23:47,011 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 10 conjunts are in the unsatisfiable core [2022-04-05 00:23:47,013 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-05 00:23:49,493 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 55 proven. 0 refuted. 0 times theorem prover too weak. 235 trivial. 0 not checked. [2022-04-05 00:23:49,494 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-04-05 00:23:49,494 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1388031523] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-05 00:23:49,494 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-04-05 00:23:49,494 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [14] total 19 [2022-04-05 00:23:49,494 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1285216682] [2022-04-05 00:23:49,495 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-05 00:23:49,495 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-04-05 00:23:49,495 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 00:23:49,495 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-04-05 00:23:49,496 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=276, Unknown=0, NotChecked=0, Total=342 [2022-04-05 00:23:49,496 INFO L87 Difference]: Start difference. First operand 52 states and 62 transitions. Second operand has 7 states, 6 states have (on average 2.5) internal successors, (15), 6 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 00:23:49,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 00:23:49,541 INFO L93 Difference]: Finished difference Result 50 states and 60 transitions. [2022-04-05 00:23:49,542 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-04-05 00:23:49,542 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.5) internal successors, (15), 6 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 51 [2022-04-05 00:23:49,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 00:23:49,542 INFO L225 Difference]: With dead ends: 50 [2022-04-05 00:23:49,542 INFO L226 Difference]: Without dead ends: 0 [2022-04-05 00:23:49,543 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=79, Invalid=301, Unknown=0, NotChecked=0, Total=380 [2022-04-05 00:23:49,543 INFO L913 BasicCegarLoop]: 11 mSDtfsCounter, 4 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 10 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-05 00:23:49,544 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 45 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 15 Invalid, 0 Unknown, 10 Unchecked, 0.0s Time] [2022-04-05 00:23:49,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2022-04-05 00:23:49,544 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2022-04-05 00:23:49,545 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-04-05 00:23:49,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2022-04-05 00:23:49,545 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 51 [2022-04-05 00:23:49,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 00:23:49,545 INFO L478 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2022-04-05 00:23:49,545 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.5) internal successors, (15), 6 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 00:23:49,545 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2022-04-05 00:23:49,545 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2022-04-05 00:23:49,548 INFO L788 garLoopResultBuilder]: Registering result SAFE for location __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2022-04-05 00:23:49,576 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-04-05 00:23:49,763 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 00:23:49,765 INFO L719 BasicCegarLoop]: Path program histogram: [3, 1, 1, 1] [2022-04-05 00:23:49,766 INFO L178 ceAbstractionStarter]: Computing trace abstraction results [2022-04-05 00:23:49,768 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 05.04 12:23:49 BasicIcfg [2022-04-05 00:23:49,769 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2022-04-05 00:23:49,770 INFO L158 Benchmark]: Toolchain (without parser) took 6806.69ms. Allocated memory was 188.7MB in the beginning and 230.7MB in the end (delta: 41.9MB). Free memory was 139.7MB in the beginning and 132.0MB in the end (delta: 7.7MB). Peak memory consumption was 49.4MB. Max. memory is 8.0GB. [2022-04-05 00:23:49,770 INFO L158 Benchmark]: CDTParser took 0.15ms. Allocated memory is still 188.7MB. Free memory was 156.4MB in the beginning and 156.3MB in the end (delta: 70.6kB). There was no memory consumed. Max. memory is 8.0GB. [2022-04-05 00:23:49,770 INFO L158 Benchmark]: CACSL2BoogieTranslator took 210.18ms. Allocated memory was 188.7MB in the beginning and 230.7MB in the end (delta: 41.9MB). Free memory was 139.5MB in the beginning and 207.7MB in the end (delta: -68.2MB). Peak memory consumption was 10.0MB. Max. memory is 8.0GB. [2022-04-05 00:23:49,771 INFO L158 Benchmark]: Boogie Preprocessor took 24.65ms. Allocated memory is still 230.7MB. Free memory was 207.7MB in the beginning and 206.5MB in the end (delta: 1.1MB). There was no memory consumed. Max. memory is 8.0GB. [2022-04-05 00:23:49,771 INFO L158 Benchmark]: RCFGBuilder took 223.53ms. Allocated memory is still 230.7MB. Free memory was 206.5MB in the beginning and 196.1MB in the end (delta: 10.4MB). Peak memory consumption was 11.5MB. Max. memory is 8.0GB. [2022-04-05 00:23:49,771 INFO L158 Benchmark]: IcfgTransformer took 290.15ms. Allocated memory is still 230.7MB. Free memory was 196.1MB in the beginning and 188.2MB in the end (delta: 7.9MB). Peak memory consumption was 8.4MB. Max. memory is 8.0GB. [2022-04-05 00:23:49,771 INFO L158 Benchmark]: TraceAbstraction took 6050.77ms. Allocated memory is still 230.7MB. Free memory was 187.8MB in the beginning and 132.0MB in the end (delta: 55.8MB). Peak memory consumption was 56.2MB. Max. memory is 8.0GB. [2022-04-05 00:23:49,773 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from IcfgTransformer: - StatisticsResult: Jordan loop acceleration statistics 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.15ms. Allocated memory is still 188.7MB. Free memory was 156.4MB in the beginning and 156.3MB in the end (delta: 70.6kB). There was no memory consumed. Max. memory is 8.0GB. * CACSL2BoogieTranslator took 210.18ms. Allocated memory was 188.7MB in the beginning and 230.7MB in the end (delta: 41.9MB). Free memory was 139.5MB in the beginning and 207.7MB in the end (delta: -68.2MB). Peak memory consumption was 10.0MB. Max. memory is 8.0GB. * Boogie Preprocessor took 24.65ms. Allocated memory is still 230.7MB. Free memory was 207.7MB in the beginning and 206.5MB in the end (delta: 1.1MB). There was no memory consumed. Max. memory is 8.0GB. * RCFGBuilder took 223.53ms. Allocated memory is still 230.7MB. Free memory was 206.5MB in the beginning and 196.1MB in the end (delta: 10.4MB). Peak memory consumption was 11.5MB. Max. memory is 8.0GB. * IcfgTransformer took 290.15ms. Allocated memory is still 230.7MB. Free memory was 196.1MB in the beginning and 188.2MB in the end (delta: 7.9MB). Peak memory consumption was 8.4MB. Max. memory is 8.0GB. * TraceAbstraction took 6050.77ms. Allocated memory is still 230.7MB. Free memory was 187.8MB in the beginning and 132.0MB in the end (delta: 55.8MB). Peak memory consumption was 56.2MB. Max. memory is 8.0GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - PositiveResult [Line: 7]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 6.0s, OverallIterations: 6, TraceHistogramMax: 10, PathProgramHistogramMax: 3, EmptinessCheckTime: 0.0s, AutomataDifference: 1.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, PartialOrderReductionTime: 0.0s, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 144 SdHoareTripleChecker+Valid, 0.3s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 143 mSDsluCounter, 194 SdHoareTripleChecker+Invalid, 0.2s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 10 IncrementalHoareTripleChecker+Unchecked, 100 mSDsCounter, 40 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 220 IncrementalHoareTripleChecker+Invalid, 270 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 40 mSolverCounterUnsat, 94 mSDtfsCounter, 220 mSolverCounterSat, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 198 GetRequests, 140 SyntacticMatches, 1 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 3.3s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=52occurred in iteration=5, InterpolantAutomatonStates: 39, 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, 6 MinimizatonAttempts, 2 StatesRemovedByMinimization, 1 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 3.5s InterpolantComputationTime, 222 NumberOfCodeBlocks, 190 NumberOfCodeBlocksAsserted, 13 NumberOfCheckSat, 253 ConstructedInterpolants, 2 QuantifiedInterpolants, 951 SizeOfPredicates, 4 NumberOfNonLiveVariables, 208 ConjunctsInSsa, 26 ConjunctsInUnsatCore, 11 InterpolantComputations, 4 PerfectInterpolantSequences, 316/719 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 - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold RESULT: Ultimate proved your program to be correct! [2022-04-05 00:23:49,803 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request...