/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/float-newlib/double_req_bl_1300.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-36cd7be [2021-02-23 17:37:34,817 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-02-23 17:37:34,821 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-02-23 17:37:34,880 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-02-23 17:37:34,881 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-02-23 17:37:34,885 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-02-23 17:37:34,889 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-02-23 17:37:34,897 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-02-23 17:37:34,913 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-02-23 17:37:34,919 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-02-23 17:37:34,921 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-02-23 17:37:34,922 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-02-23 17:37:34,923 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-02-23 17:37:34,926 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-02-23 17:37:34,928 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-02-23 17:37:34,929 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-02-23 17:37:34,934 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-02-23 17:37:34,935 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-02-23 17:37:34,944 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-02-23 17:37:34,949 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-02-23 17:37:34,953 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-02-23 17:37:34,955 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-02-23 17:37:34,956 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-02-23 17:37:34,959 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-02-23 17:37:34,968 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-02-23 17:37:34,980 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-02-23 17:37:34,981 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-02-23 17:37:34,981 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-02-23 17:37:34,983 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2021-02-23 17:37:35,011 INFO L113 SettingsManager]: Loading preferences was successful [2021-02-23 17:37:35,012 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-02-23 17:37:35,016 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-02-23 17:37:35,018 INFO L138 SettingsManager]: * sizeof long=4 [2021-02-23 17:37:35,018 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-02-23 17:37:35,018 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-02-23 17:37:35,019 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-02-23 17:37:35,019 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-02-23 17:37:35,019 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-02-23 17:37:35,019 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-02-23 17:37:35,019 INFO L138 SettingsManager]: * sizeof long double=12 [2021-02-23 17:37:35,019 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-02-23 17:37:35,020 INFO L138 SettingsManager]: * Use constant arrays=true [2021-02-23 17:37:35,020 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-02-23 17:37:35,020 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-02-23 17:37:35,020 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2021-02-23 17:37:35,021 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-02-23 17:37:35,021 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-02-23 17:37:35,021 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-02-23 17:37:35,021 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-02-23 17:37:35,021 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-02-23 17:37:35,022 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-02-23 17:37:35,022 INFO L138 SettingsManager]: * Use separate solver for trace checks=false 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-02-23 17:37:35,389 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-02-23 17:37:35,427 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-02-23 17:37:35,430 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-02-23 17:37:35,432 INFO L271 PluginConnector]: Initializing CDTParser... [2021-02-23 17:37:35,432 INFO L275 PluginConnector]: CDTParser initialized [2021-02-23 17:37:35,433 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/float-newlib/double_req_bl_1300.c [2021-02-23 17:37:35,514 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/174e649ab/71127a5c3f054c3cae1ee9bddbeb585c/FLAGebd9036a6 [2021-02-23 17:37:36,164 INFO L306 CDTParser]: Found 1 translation units. [2021-02-23 17:37:36,164 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/float-newlib/double_req_bl_1300.c [2021-02-23 17:37:36,173 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/174e649ab/71127a5c3f054c3cae1ee9bddbeb585c/FLAGebd9036a6 [2021-02-23 17:37:36,532 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/174e649ab/71127a5c3f054c3cae1ee9bddbeb585c [2021-02-23 17:37:36,536 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-02-23 17:37:36,553 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-02-23 17:37:36,558 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-02-23 17:37:36,558 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-02-23 17:37:36,562 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-02-23 17:37:36,563 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.02 05:37:36" (1/1) ... [2021-02-23 17:37:36,565 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@74224b01 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 05:37:36, skipping insertion in model container [2021-02-23 17:37:36,565 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.02 05:37:36" (1/1) ... [2021-02-23 17:37:36,576 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-02-23 17:37:36,599 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-02-23 17:37:36,852 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/float-newlib/double_req_bl_1300.c[1563,1576] [2021-02-23 17:37:36,856 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-02-23 17:37:36,868 INFO L203 MainTranslator]: Completed pre-run [2021-02-23 17:37:36,895 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/float-newlib/double_req_bl_1300.c[1563,1576] [2021-02-23 17:37:36,896 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-02-23 17:37:36,914 INFO L208 MainTranslator]: Completed translation [2021-02-23 17:37:36,915 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 05:37:36 WrapperNode [2021-02-23 17:37:36,915 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-02-23 17:37:36,916 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-02-23 17:37:36,917 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-02-23 17:37:36,917 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-02-23 17:37:36,931 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 05:37:36" (1/1) ... [2021-02-23 17:37:36,932 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 05:37:36" (1/1) ... [2021-02-23 17:37:36,942 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 05:37:36" (1/1) ... [2021-02-23 17:37:36,943 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 05:37:36" (1/1) ... [2021-02-23 17:37:36,954 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 05:37:36" (1/1) ... [2021-02-23 17:37:36,959 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 05:37:36" (1/1) ... [2021-02-23 17:37:36,961 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 05:37:36" (1/1) ... [2021-02-23 17:37:36,964 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-02-23 17:37:36,966 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-02-23 17:37:36,966 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-02-23 17:37:36,966 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-02-23 17:37:36,967 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 05:37:36" (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 [2021-02-23 17:37:37,073 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-02-23 17:37:37,073 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-02-23 17:37:37,073 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-02-23 17:37:37,073 INFO L138 BoogieDeclarations]: Found implementation of procedure isinf_double [2021-02-23 17:37:37,074 INFO L138 BoogieDeclarations]: Found implementation of procedure isnan_double [2021-02-23 17:37:37,074 INFO L138 BoogieDeclarations]: Found implementation of procedure isfinite_double [2021-02-23 17:37:37,074 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-02-23 17:37:37,075 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-02-23 17:37:37,075 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-02-23 17:37:37,075 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-02-23 17:37:37,075 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-02-23 17:37:37,075 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_double [2021-02-23 17:37:37,076 INFO L130 BoogieDeclarations]: Found specification of procedure isinf_double [2021-02-23 17:37:37,076 INFO L130 BoogieDeclarations]: Found specification of procedure write~real [2021-02-23 17:37:37,076 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-02-23 17:37:37,076 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-02-23 17:37:37,077 INFO L130 BoogieDeclarations]: Found specification of procedure isnan_double [2021-02-23 17:37:37,077 INFO L130 BoogieDeclarations]: Found specification of procedure isfinite_double [2021-02-23 17:37:37,077 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-02-23 17:37:37,077 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-02-23 17:37:37,077 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-02-23 17:37:37,078 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-02-23 17:37:37,078 INFO L130 BoogieDeclarations]: Found specification of procedure read~real [2021-02-23 17:37:37,078 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-02-23 17:37:37,632 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-02-23 17:37:37,633 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2021-02-23 17:37:37,634 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.02 05:37:37 BoogieIcfgContainer [2021-02-23 17:37:37,634 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-02-23 17:37:37,636 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-02-23 17:37:37,636 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-02-23 17:37:37,640 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-02-23 17:37:37,640 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.02 05:37:36" (1/3) ... [2021-02-23 17:37:37,641 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@46228111 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.02 05:37:37, skipping insertion in model container [2021-02-23 17:37:37,641 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 05:37:36" (2/3) ... [2021-02-23 17:37:37,642 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@46228111 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.02 05:37:37, skipping insertion in model container [2021-02-23 17:37:37,642 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.02 05:37:37" (3/3) ... [2021-02-23 17:37:37,643 INFO L111 eAbstractionObserver]: Analyzing ICFG double_req_bl_1300.c [2021-02-23 17:37:37,650 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-02-23 17:37:37,654 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-02-23 17:37:37,672 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-02-23 17:37:37,696 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-02-23 17:37:37,696 INFO L377 AbstractCegarLoop]: Hoare is true [2021-02-23 17:37:37,696 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-02-23 17:37:37,696 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-02-23 17:37:37,697 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-02-23 17:37:37,697 INFO L381 AbstractCegarLoop]: Difference is false [2021-02-23 17:37:37,697 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-02-23 17:37:37,697 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-02-23 17:37:37,715 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states. [2021-02-23 17:37:37,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-02-23 17:37:37,726 INFO L414 BasicCegarLoop]: Found error trace [2021-02-23 17:37:37,727 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-23 17:37:37,727 INFO L428 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-23 17:37:37,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-23 17:37:37,734 INFO L82 PathProgramCache]: Analyzing trace with hash -1144836502, now seen corresponding path program 1 times [2021-02-23 17:37:37,744 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-23 17:37:37,744 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [867877410] [2021-02-23 17:37:37,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-23 17:37:37,839 INFO L218 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-02-23 17:37:37,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 17:37:38,066 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 17:37:38,068 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 17:37:38,069 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 17:37:38,070 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 17:37:38,128 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-02-23 17:37:38,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 17:37:38,146 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 17:37:38,147 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 17:37:38,169 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2021-02-23 17:37:38,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 17:37:38,178 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 17:37:38,179 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 17:37:38,180 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 17:37:38,181 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 17:37:38,182 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 32 [2021-02-23 17:37:38,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 17:37:38,189 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 17:37:38,190 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 17:37:38,191 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 17:37:38,192 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 17:37:38,204 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-23 17:37:38,206 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [867877410] [2021-02-23 17:37:38,208 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-23 17:37:38,208 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-02-23 17:37:38,208 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [789121525] [2021-02-23 17:37:38,215 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-02-23 17:37:38,215 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-02-23 17:37:38,231 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-02-23 17:37:38,231 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-02-23 17:37:38,234 INFO L87 Difference]: Start difference. First operand 78 states. Second operand 4 states. [2021-02-23 17:37:38,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-23 17:37:38,646 INFO L93 Difference]: Finished difference Result 137 states and 150 transitions. [2021-02-23 17:37:38,647 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-02-23 17:37:38,648 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 44 [2021-02-23 17:37:38,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-23 17:37:38,658 INFO L225 Difference]: With dead ends: 137 [2021-02-23 17:37:38,658 INFO L226 Difference]: Without dead ends: 69 [2021-02-23 17:37:38,662 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-02-23 17:37:38,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-02-23 17:37:38,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2021-02-23 17:37:38,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2021-02-23 17:37:38,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 69 transitions. [2021-02-23 17:37:38,722 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 69 transitions. Word has length 44 [2021-02-23 17:37:38,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-23 17:37:38,723 INFO L480 AbstractCegarLoop]: Abstraction has 69 states and 69 transitions. [2021-02-23 17:37:38,723 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2021-02-23 17:37:38,723 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 69 transitions. [2021-02-23 17:37:38,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-02-23 17:37:38,726 INFO L414 BasicCegarLoop]: Found error trace [2021-02-23 17:37:38,726 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-23 17:37:38,726 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-02-23 17:37:38,727 INFO L428 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-23 17:37:38,727 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-23 17:37:38,728 INFO L82 PathProgramCache]: Analyzing trace with hash 1786091468, now seen corresponding path program 1 times [2021-02-23 17:37:38,728 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-23 17:37:38,728 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1784879714] [2021-02-23 17:37:38,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-23 17:37:38,732 INFO L218 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-02-23 17:37:38,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 17:37:38,866 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 17:37:38,867 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 17:37:38,869 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 17:37:38,870 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 2 [2021-02-23 17:37:38,876 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 17:37:38,880 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 17:37:38,950 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-02-23 17:37:38,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 17:37:38,981 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 17:37:38,982 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 17:37:39,007 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2021-02-23 17:37:39,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 17:37:39,052 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 17:37:39,054 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 17:37:39,055 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 42 [2021-02-23 17:37:39,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 17:37:39,096 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 17:37:39,097 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 17:37:39,108 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-23 17:37:39,109 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1784879714] [2021-02-23 17:37:39,109 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-23 17:37:39,109 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-02-23 17:37:39,110 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1042287518] [2021-02-23 17:37:39,112 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-02-23 17:37:39,113 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-02-23 17:37:39,117 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-02-23 17:37:39,117 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-02-23 17:37:39,118 INFO L87 Difference]: Start difference. First operand 69 states and 69 transitions. Second operand 5 states. [2021-02-23 17:37:39,427 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-23 17:37:39,427 INFO L93 Difference]: Finished difference Result 93 states and 92 transitions. [2021-02-23 17:37:39,428 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-02-23 17:37:39,428 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 61 [2021-02-23 17:37:39,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-23 17:37:39,430 INFO L225 Difference]: With dead ends: 93 [2021-02-23 17:37:39,431 INFO L226 Difference]: Without dead ends: 69 [2021-02-23 17:37:39,432 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-02-23 17:37:39,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-02-23 17:37:39,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2021-02-23 17:37:39,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2021-02-23 17:37:39,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 68 transitions. [2021-02-23 17:37:39,446 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 68 transitions. Word has length 61 [2021-02-23 17:37:39,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-23 17:37:39,446 INFO L480 AbstractCegarLoop]: Abstraction has 69 states and 68 transitions. [2021-02-23 17:37:39,446 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2021-02-23 17:37:39,446 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 68 transitions. [2021-02-23 17:37:39,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-02-23 17:37:39,449 INFO L414 BasicCegarLoop]: Found error trace [2021-02-23 17:37:39,449 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-23 17:37:39,449 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-02-23 17:37:39,449 INFO L428 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-23 17:37:39,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-23 17:37:39,450 INFO L82 PathProgramCache]: Analyzing trace with hash -1945405152, now seen corresponding path program 1 times [2021-02-23 17:37:39,450 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-23 17:37:39,451 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [64452521] [2021-02-23 17:37:39,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-23 17:37:39,453 INFO L218 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-02-23 17:37:39,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-02-23 17:37:39,553 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-02-23 17:37:39,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-02-23 17:37:39,666 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-02-23 17:37:39,708 INFO L173 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2021-02-23 17:37:39,709 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2021-02-23 17:37:39,709 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-02-23 17:37:39,732 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.02 05:37:39 BoogieIcfgContainer [2021-02-23 17:37:39,732 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-02-23 17:37:39,734 INFO L168 Benchmark]: Toolchain (without parser) took 3193.12 ms. Allocated memory was 160.4 MB in the beginning and 212.9 MB in the end (delta: 52.4 MB). Free memory was 135.7 MB in the beginning and 123.7 MB in the end (delta: 11.9 MB). Peak memory consumption was 65.0 MB. Max. memory is 8.0 GB. [2021-02-23 17:37:39,735 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 160.4 MB. Free memory is still 133.6 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-02-23 17:37:39,736 INFO L168 Benchmark]: CACSL2BoogieTranslator took 357.96 ms. Allocated memory is still 160.4 MB. Free memory was 134.5 MB in the beginning and 124.4 MB in the end (delta: 10.1 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2021-02-23 17:37:39,736 INFO L168 Benchmark]: Boogie Preprocessor took 48.15 ms. Allocated memory is still 160.4 MB. Free memory was 124.4 MB in the beginning and 122.8 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2021-02-23 17:37:39,737 INFO L168 Benchmark]: RCFGBuilder took 668.98 ms. Allocated memory is still 160.4 MB. Free memory was 122.6 MB in the beginning and 136.0 MB in the end (delta: -13.4 MB). Peak memory consumption was 17.6 MB. Max. memory is 8.0 GB. [2021-02-23 17:37:39,738 INFO L168 Benchmark]: TraceAbstraction took 2095.79 ms. Allocated memory was 160.4 MB in the beginning and 212.9 MB in the end (delta: 52.4 MB). Free memory was 135.5 MB in the beginning and 123.7 MB in the end (delta: 11.8 MB). Peak memory consumption was 65.2 MB. Max. memory is 8.0 GB. [2021-02-23 17:37:39,742 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 160.4 MB. Free memory is still 133.6 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 357.96 ms. Allocated memory is still 160.4 MB. Free memory was 134.5 MB in the beginning and 124.4 MB in the end (delta: 10.1 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 48.15 ms. Allocated memory is still 160.4 MB. Free memory was 124.4 MB in the beginning and 122.8 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 668.98 ms. Allocated memory is still 160.4 MB. Free memory was 122.6 MB in the beginning and 136.0 MB in the end (delta: -13.4 MB). Peak memory consumption was 17.6 MB. Max. memory is 8.0 GB. * TraceAbstraction took 2095.79 ms. Allocated memory was 160.4 MB in the beginning and 212.9 MB in the end (delta: 52.4 MB). Free memory was 135.5 MB in the beginning and 123.7 MB in the end (delta: 11.8 MB). Peak memory consumption was 65.2 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - UnprovableResult [Line: 61]: Unable to prove that call to reach_error is unreachable Unable to prove that call to reach_error is unreachable Reason: overapproximation of bitwiseOr at line 29, overapproximation of bitwiseAnd at line 42, overapproximation of someBinaryDOUBLEComparisonOperation at line 60, overapproximation of to_real at line 57. Possible FailurePath: [L52] double x = __VERIFIER_nondet_double(); [L55] CALL, EXPR isinf_double(x) [L19] __int32_t hx, lx; [L21] ieee_double_shape_type ew_u; [L22] ew_u.value = (x) [L23] EXPR ew_u.parts.msw [L23] (hx) = ew_u.parts.msw [L24] EXPR ew_u.parts.lsw [L24] (lx) = ew_u.parts.lsw [L26] hx &= 0x7fffffff [L27] hx |= (__uint32_t)(lx | (-lx)) >> 31 [L28] hx = 0x7ff00000 - hx [L29] return 1 - (int)((__uint32_t)(hx | (-hx)) >> 31); [L55] RET, EXPR isinf_double(x) [L55] !isinf_double(x) && !isnan_double(x) [L55] CALL, EXPR isnan_double(x) [L33] return x != x; [L55] RET, EXPR isnan_double(x) [L55] !isinf_double(x) && !isnan_double(x) [L55] COND TRUE !isinf_double(x) && !isnan_double(x) [L57] CALL, EXPR isfinite_double(x) [L36] __int32_t hx; [L38] ieee_double_shape_type gh_u; [L39] gh_u.value = (x) [L40] EXPR gh_u.parts.msw [L40] (hx) = gh_u.parts.msw [L42] return (int)((__uint32_t)((hx & 0x7fffffff) - 0x7ff00000) >> 31); [L57] RET, EXPR isfinite_double(x) [L57] double res = isfinite_double(x); [L60] COND TRUE res == 0.0 [L61] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 7 procedures, 81 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 2.0s, OverallIterations: 3, TraceHistogramMax: 1, AutomataDifference: 0.7s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 141 SDtfs, 42 SDslu, 136 SDs, 0 SdLazy, 170 SolverSat, 16 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 23 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=78occurred in iteration=0, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 2 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: No data available, 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...