/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/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/ldv-regression/rule57_ebda_blast_2.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-b7b32d2 [2021-02-21 16:10:41,194 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-02-21 16:10:41,197 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-02-21 16:10:41,237 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-02-21 16:10:41,238 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-02-21 16:10:41,239 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-02-21 16:10:41,241 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-02-21 16:10:41,244 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-02-21 16:10:41,246 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-02-21 16:10:41,247 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-02-21 16:10:41,249 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-02-21 16:10:41,250 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-02-21 16:10:41,251 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-02-21 16:10:41,252 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-02-21 16:10:41,253 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-02-21 16:10:41,255 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-02-21 16:10:41,256 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-02-21 16:10:41,257 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-02-21 16:10:41,259 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-02-21 16:10:41,262 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-02-21 16:10:41,264 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-02-21 16:10:41,266 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-02-21 16:10:41,268 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-02-21 16:10:41,269 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-02-21 16:10:41,272 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-02-21 16:10:41,304 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-02-21 16:10:41,305 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-02-21 16:10:41,306 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-02-21 16:10:41,308 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2021-02-21 16:10:41,335 INFO L113 SettingsManager]: Loading preferences was successful [2021-02-21 16:10:41,335 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-02-21 16:10:41,336 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-02-21 16:10:41,337 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-02-21 16:10:41,337 INFO L138 SettingsManager]: * Use SBE=true [2021-02-21 16:10:41,337 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-02-21 16:10:41,338 INFO L138 SettingsManager]: * sizeof long=4 [2021-02-21 16:10:41,338 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-02-21 16:10:41,338 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-02-21 16:10:41,338 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-02-21 16:10:41,339 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-02-21 16:10:41,339 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-02-21 16:10:41,339 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-02-21 16:10:41,339 INFO L138 SettingsManager]: * sizeof long double=12 [2021-02-21 16:10:41,340 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-02-21 16:10:41,340 INFO L138 SettingsManager]: * Use constant arrays=true [2021-02-21 16:10:41,340 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-02-21 16:10:41,340 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-02-21 16:10:41,341 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-02-21 16:10:41,341 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-02-21 16:10:41,341 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-02-21 16:10:41,341 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-02-21 16:10:41,342 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-02-21 16:10:41,342 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-02-21 16:10:41,342 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-02-21 16:10:41,343 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-02-21 16:10:41,343 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-02-21 16:10:41,343 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-02-21 16:10:41,343 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-02-21 16:10:41,720 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-02-21 16:10:41,761 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-02-21 16:10:41,766 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-02-21 16:10:41,767 INFO L271 PluginConnector]: Initializing CDTParser... [2021-02-21 16:10:41,768 INFO L275 PluginConnector]: CDTParser initialized [2021-02-21 16:10:41,769 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-regression/rule57_ebda_blast_2.i [2021-02-21 16:10:41,871 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a6c4992c6/e5dde507d9944bd9923a408d46658e4d/FLAG44c78bd87 [2021-02-21 16:10:42,506 INFO L306 CDTParser]: Found 1 translation units. [2021-02-21 16:10:42,506 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/ldv-regression/rule57_ebda_blast_2.i [2021-02-21 16:10:42,522 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a6c4992c6/e5dde507d9944bd9923a408d46658e4d/FLAG44c78bd87 [2021-02-21 16:10:42,867 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a6c4992c6/e5dde507d9944bd9923a408d46658e4d [2021-02-21 16:10:42,870 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-02-21 16:10:42,884 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-02-21 16:10:42,886 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-02-21 16:10:42,886 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-02-21 16:10:42,890 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-02-21 16:10:42,891 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.02 04:10:42" (1/1) ... [2021-02-21 16:10:42,893 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2a1db650 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.02 04:10:42, skipping insertion in model container [2021-02-21 16:10:42,893 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.02 04:10:42" (1/1) ... [2021-02-21 16:10:42,902 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-02-21 16:10:42,922 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-02-21 16:10:43,081 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/ldv-regression/rule57_ebda_blast_2.i[341,354] [2021-02-21 16:10:43,165 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-02-21 16:10:43,186 INFO L203 MainTranslator]: Completed pre-run [2021-02-21 16:10:43,199 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/ldv-regression/rule57_ebda_blast_2.i[341,354] [2021-02-21 16:10:43,211 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-02-21 16:10:43,233 INFO L208 MainTranslator]: Completed translation [2021-02-21 16:10:43,234 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.02 04:10:43 WrapperNode [2021-02-21 16:10:43,234 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-02-21 16:10:43,235 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-02-21 16:10:43,235 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-02-21 16:10:43,235 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-02-21 16:10:43,251 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.02 04:10:43" (1/1) ... [2021-02-21 16:10:43,251 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.02 04:10:43" (1/1) ... [2021-02-21 16:10:43,263 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.02 04:10:43" (1/1) ... [2021-02-21 16:10:43,263 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.02 04:10:43" (1/1) ... [2021-02-21 16:10:43,277 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.02 04:10:43" (1/1) ... [2021-02-21 16:10:43,280 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.02 04:10:43" (1/1) ... [2021-02-21 16:10:43,283 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.02 04:10:43" (1/1) ... [2021-02-21 16:10:43,287 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-02-21 16:10:43,288 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-02-21 16:10:43,288 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-02-21 16:10:43,288 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-02-21 16:10:43,290 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.02 04:10:43" (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 [2021-02-21 16:10:43,411 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-02-21 16:10:43,412 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-02-21 16:10:43,412 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-02-21 16:10:43,412 INFO L138 BoogieDeclarations]: Found implementation of procedure __blast_assert [2021-02-21 16:10:43,412 INFO L138 BoogieDeclarations]: Found implementation of procedure kzalloc [2021-02-21 16:10:43,412 INFO L138 BoogieDeclarations]: Found implementation of procedure kfree [2021-02-21 16:10:43,413 INFO L138 BoogieDeclarations]: Found implementation of procedure ibmphp_find_same_bus_num [2021-02-21 16:10:43,413 INFO L138 BoogieDeclarations]: Found implementation of procedure fillslotinfo [2021-02-21 16:10:43,413 INFO L138 BoogieDeclarations]: Found implementation of procedure ibmphp_init_devno [2021-02-21 16:10:43,413 INFO L138 BoogieDeclarations]: Found implementation of procedure ebda_rsrc_controller [2021-02-21 16:10:43,413 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-02-21 16:10:43,413 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.meminit [2021-02-21 16:10:43,414 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-02-21 16:10:43,414 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-02-21 16:10:43,414 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-02-21 16:10:43,414 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-02-21 16:10:43,414 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-02-21 16:10:43,415 INFO L130 BoogieDeclarations]: Found specification of procedure __blast_assert [2021-02-21 16:10:43,415 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2021-02-21 16:10:43,415 INFO L130 BoogieDeclarations]: Found specification of procedure kzalloc [2021-02-21 16:10:43,415 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-02-21 16:10:43,415 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.meminit [2021-02-21 16:10:43,415 INFO L130 BoogieDeclarations]: Found specification of procedure kfree [2021-02-21 16:10:43,416 INFO L130 BoogieDeclarations]: Found specification of procedure ibmphp_find_same_bus_num [2021-02-21 16:10:43,416 INFO L130 BoogieDeclarations]: Found specification of procedure fillslotinfo [2021-02-21 16:10:43,416 INFO L130 BoogieDeclarations]: Found specification of procedure ibmphp_init_devno [2021-02-21 16:10:43,416 INFO L130 BoogieDeclarations]: Found specification of procedure ebda_rsrc_controller [2021-02-21 16:10:43,416 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-02-21 16:10:43,417 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-02-21 16:10:43,417 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-02-21 16:10:43,417 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-02-21 16:10:43,417 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-02-21 16:10:43,417 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-02-21 16:10:43,417 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-02-21 16:10:43,418 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-02-21 16:10:43,418 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-02-21 16:10:43,987 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-02-21 16:10:43,987 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2021-02-21 16:10:43,990 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.02 04:10:43 BoogieIcfgContainer [2021-02-21 16:10:43,990 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-02-21 16:10:44,004 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-02-21 16:10:44,004 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-02-21 16:10:44,008 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-02-21 16:10:44,008 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.02 04:10:42" (1/3) ... [2021-02-21 16:10:44,009 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3c6f94e5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.02 04:10:44, skipping insertion in model container [2021-02-21 16:10:44,009 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.02 04:10:43" (2/3) ... [2021-02-21 16:10:44,009 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3c6f94e5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.02 04:10:44, skipping insertion in model container [2021-02-21 16:10:44,010 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.02 04:10:43" (3/3) ... [2021-02-21 16:10:44,011 INFO L111 eAbstractionObserver]: Analyzing ICFG rule57_ebda_blast_2.i [2021-02-21 16:10:44,018 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-02-21 16:10:44,024 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-02-21 16:10:44,046 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-02-21 16:10:44,076 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-02-21 16:10:44,076 INFO L377 AbstractCegarLoop]: Hoare is true [2021-02-21 16:10:44,076 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-02-21 16:10:44,076 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-02-21 16:10:44,077 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-02-21 16:10:44,077 INFO L381 AbstractCegarLoop]: Difference is false [2021-02-21 16:10:44,077 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-02-21 16:10:44,077 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-02-21 16:10:44,096 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states. [2021-02-21 16:10:44,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-02-21 16:10:44,103 INFO L414 BasicCegarLoop]: Found error trace [2021-02-21 16:10:44,105 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] [2021-02-21 16:10:44,105 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__blast_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-21 16:10:44,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-21 16:10:44,112 INFO L82 PathProgramCache]: Analyzing trace with hash 279900583, now seen corresponding path program 1 times [2021-02-21 16:10:44,124 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-21 16:10:44,125 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1881030272] [2021-02-21 16:10:44,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-21 16:10:44,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-21 16:10:44,377 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 16:10:44,382 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-21 16:10:44,383 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 16:10:44,386 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-21 16:10:44,520 WARN L202 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2021-02-21 16:10:44,522 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-02-21 16:10:44,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-21 16:10:44,543 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 16:10:44,544 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-21 16:10:44,624 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2021-02-21 16:10:44,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-21 16:10:44,686 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 16:10:44,687 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-21 16:10:44,688 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 16:10:44,689 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 4 [2021-02-21 16:10:44,696 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 16:10:44,697 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 4 [2021-02-21 16:10:44,705 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 16:10:44,705 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-21 16:10:44,719 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-02-21 16:10:44,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-21 16:10:44,743 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 16:10:44,744 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 4 [2021-02-21 16:10:44,754 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 16:10:44,755 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 4 [2021-02-21 16:10:44,778 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-02-21 16:10:44,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-21 16:10:44,786 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 16:10:44,787 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-21 16:10:44,794 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-21 16:10:44,795 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1881030272] [2021-02-21 16:10:44,796 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-21 16:10:44,796 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-02-21 16:10:44,797 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1466976196] [2021-02-21 16:10:44,802 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-02-21 16:10:44,803 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-21 16:10:44,817 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-02-21 16:10:44,819 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2021-02-21 16:10:44,821 INFO L87 Difference]: Start difference. First operand 64 states. Second operand 10 states. [2021-02-21 16:10:45,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-21 16:10:45,337 INFO L93 Difference]: Finished difference Result 81 states and 93 transitions. [2021-02-21 16:10:45,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-02-21 16:10:45,339 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2021-02-21 16:10:45,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-21 16:10:45,350 INFO L225 Difference]: With dead ends: 81 [2021-02-21 16:10:45,350 INFO L226 Difference]: Without dead ends: 62 [2021-02-21 16:10:45,354 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2021-02-21 16:10:45,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-02-21 16:10:45,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 58. [2021-02-21 16:10:45,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2021-02-21 16:10:45,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 65 transitions. [2021-02-21 16:10:45,428 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 65 transitions. Word has length 26 [2021-02-21 16:10:45,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-21 16:10:45,429 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 65 transitions. [2021-02-21 16:10:45,430 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2021-02-21 16:10:45,430 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 65 transitions. [2021-02-21 16:10:45,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-02-21 16:10:45,432 INFO L414 BasicCegarLoop]: Found error trace [2021-02-21 16:10:45,433 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-21 16:10:45,433 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-02-21 16:10:45,433 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__blast_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-21 16:10:45,434 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-21 16:10:45,434 INFO L82 PathProgramCache]: Analyzing trace with hash -1136304915, now seen corresponding path program 1 times [2021-02-21 16:10:45,435 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-21 16:10:45,435 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2065966827] [2021-02-21 16:10:45,435 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-21 16:10:45,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-21 16:10:45,560 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 16:10:45,561 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-21 16:10:45,563 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 16:10:45,564 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-21 16:10:45,601 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-02-21 16:10:45,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-21 16:10:45,625 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 16:10:45,626 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-21 16:10:45,647 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2021-02-21 16:10:45,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-21 16:10:45,677 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 16:10:45,678 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-21 16:10:45,679 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 16:10:45,679 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 4 [2021-02-21 16:10:45,686 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 16:10:45,687 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 4 [2021-02-21 16:10:45,695 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 16:10:45,696 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-21 16:10:45,708 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-02-21 16:10:45,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-21 16:10:45,716 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 16:10:45,717 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-21 16:10:45,726 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-02-21 16:10:45,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-21 16:10:45,731 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 16:10:45,731 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-21 16:10:45,732 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-02-21 16:10:45,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-21 16:10:45,748 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 16:10:45,749 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 4 [2021-02-21 16:10:45,759 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 16:10:45,760 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 4 [2021-02-21 16:10:45,773 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-02-21 16:10:45,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-21 16:10:45,780 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 16:10:45,781 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-21 16:10:45,788 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-02-21 16:10:45,789 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2065966827] [2021-02-21 16:10:45,789 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-21 16:10:45,789 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-02-21 16:10:45,789 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1021127815] [2021-02-21 16:10:45,791 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-02-21 16:10:45,791 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-21 16:10:45,792 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-02-21 16:10:45,793 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2021-02-21 16:10:45,793 INFO L87 Difference]: Start difference. First operand 58 states and 65 transitions. Second operand 10 states. [2021-02-21 16:10:46,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-21 16:10:46,330 INFO L93 Difference]: Finished difference Result 79 states and 84 transitions. [2021-02-21 16:10:46,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-02-21 16:10:46,331 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 37 [2021-02-21 16:10:46,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-21 16:10:46,333 INFO L225 Difference]: With dead ends: 79 [2021-02-21 16:10:46,333 INFO L226 Difference]: Without dead ends: 70 [2021-02-21 16:10:46,334 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=71, Invalid=271, Unknown=0, NotChecked=0, Total=342 [2021-02-21 16:10:46,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-02-21 16:10:46,348 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 66. [2021-02-21 16:10:46,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2021-02-21 16:10:46,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 71 transitions. [2021-02-21 16:10:46,350 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 71 transitions. Word has length 37 [2021-02-21 16:10:46,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-21 16:10:46,351 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 71 transitions. [2021-02-21 16:10:46,351 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2021-02-21 16:10:46,351 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 71 transitions. [2021-02-21 16:10:46,353 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-02-21 16:10:46,353 INFO L414 BasicCegarLoop]: Found error trace [2021-02-21 16:10:46,353 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 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] [2021-02-21 16:10:46,354 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-02-21 16:10:46,354 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__blast_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-21 16:10:46,354 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-21 16:10:46,355 INFO L82 PathProgramCache]: Analyzing trace with hash -421909007, now seen corresponding path program 1 times [2021-02-21 16:10:46,355 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-21 16:10:46,355 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1165954580] [2021-02-21 16:10:46,355 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-21 16:10:46,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-21 16:10:46,440 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 16:10:46,441 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-21 16:10:46,442 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 16:10:46,442 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-21 16:10:46,446 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 16:10:46,446 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-21 16:10:46,472 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-02-21 16:10:46,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-21 16:10:46,494 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 16:10:46,494 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-21 16:10:46,513 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2021-02-21 16:10:46,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-21 16:10:46,563 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 16:10:46,564 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-21 16:10:46,565 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 16:10:46,566 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 5 [2021-02-21 16:10:46,583 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-02-21 16:10:46,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-21 16:10:46,594 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 16:10:46,595 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-21 16:10:46,605 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-02-21 16:10:46,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-21 16:10:46,611 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 16:10:46,611 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-21 16:10:46,612 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-02-21 16:10:46,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-21 16:10:46,631 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 16:10:46,632 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-21 16:10:46,634 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-02-21 16:10:46,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-21 16:10:46,644 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 16:10:46,645 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-21 16:10:46,646 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-02-21 16:10:46,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-21 16:10:46,660 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 16:10:46,661 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-21 16:10:46,672 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2021-02-21 16:10:46,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-21 16:10:46,683 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 16:10:46,684 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-21 16:10:46,685 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-21 16:10:46,685 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 5 [2021-02-21 16:10:46,694 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-02-21 16:10:46,695 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1165954580] [2021-02-21 16:10:46,695 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-21 16:10:46,696 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-02-21 16:10:46,696 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [850278205] [2021-02-21 16:10:46,697 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-02-21 16:10:46,698 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-21 16:10:46,698 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-02-21 16:10:46,699 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-02-21 16:10:46,699 INFO L87 Difference]: Start difference. First operand 66 states and 71 transitions. Second operand 8 states. [2021-02-21 16:10:47,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-21 16:10:47,248 INFO L93 Difference]: Finished difference Result 80 states and 84 transitions. [2021-02-21 16:10:47,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-02-21 16:10:47,249 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 51 [2021-02-21 16:10:47,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-21 16:10:47,251 INFO L225 Difference]: With dead ends: 80 [2021-02-21 16:10:47,251 INFO L226 Difference]: Without dead ends: 68 [2021-02-21 16:10:47,252 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=74, Invalid=166, Unknown=0, NotChecked=0, Total=240 [2021-02-21 16:10:47,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-02-21 16:10:47,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 66. [2021-02-21 16:10:47,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2021-02-21 16:10:47,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 70 transitions. [2021-02-21 16:10:47,265 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 70 transitions. Word has length 51 [2021-02-21 16:10:47,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-21 16:10:47,265 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 70 transitions. [2021-02-21 16:10:47,265 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2021-02-21 16:10:47,265 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 70 transitions. [2021-02-21 16:10:47,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-02-21 16:10:47,267 INFO L414 BasicCegarLoop]: Found error trace [2021-02-21 16:10:47,268 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 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] [2021-02-21 16:10:47,268 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-02-21 16:10:47,268 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__blast_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-21 16:10:47,268 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-21 16:10:47,269 INFO L82 PathProgramCache]: Analyzing trace with hash -163743569, now seen corresponding path program 1 times [2021-02-21 16:10:47,269 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-21 16:10:47,269 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1441762655] [2021-02-21 16:10:47,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-21 16:10:47,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-02-21 16:10:47,298 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-02-21 16:10:47,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-02-21 16:10:47,353 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-02-21 16:10:47,407 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-02-21 16:10:47,407 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2021-02-21 16:10:47,407 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-02-21 16:10:47,492 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.02 04:10:47 BoogieIcfgContainer [2021-02-21 16:10:47,492 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-02-21 16:10:47,494 INFO L168 Benchmark]: Toolchain (without parser) took 4621.41 ms. Allocated memory was 169.9 MB in the beginning and 211.8 MB in the end (delta: 41.9 MB). Free memory was 144.7 MB in the beginning and 184.9 MB in the end (delta: -40.2 MB). Peak memory consumption was 115.3 MB. Max. memory is 8.0 GB. [2021-02-21 16:10:47,495 INFO L168 Benchmark]: CDTParser took 0.19 ms. Allocated memory is still 169.9 MB. Free memory is still 144.1 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-02-21 16:10:47,495 INFO L168 Benchmark]: CACSL2BoogieTranslator took 348.37 ms. Allocated memory is still 169.9 MB. Free memory was 143.6 MB in the beginning and 132.8 MB in the end (delta: 10.8 MB). Peak memory consumption was 10.5 MB. Max. memory is 8.0 GB. [2021-02-21 16:10:47,496 INFO L168 Benchmark]: Boogie Preprocessor took 51.92 ms. Allocated memory is still 169.9 MB. Free memory was 132.8 MB in the beginning and 131.1 MB in the end (delta: 1.7 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2021-02-21 16:10:47,496 INFO L168 Benchmark]: RCFGBuilder took 701.90 ms. Allocated memory is still 169.9 MB. Free memory was 130.8 MB in the beginning and 107.2 MB in the end (delta: 23.5 MB). Peak memory consumption was 23.1 MB. Max. memory is 8.0 GB. [2021-02-21 16:10:47,497 INFO L168 Benchmark]: TraceAbstraction took 3488.73 ms. Allocated memory was 169.9 MB in the beginning and 211.8 MB in the end (delta: 41.9 MB). Free memory was 152.3 MB in the beginning and 184.9 MB in the end (delta: -32.6 MB). Peak memory consumption was 122.5 MB. Max. memory is 8.0 GB. [2021-02-21 16:10:47,500 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.19 ms. Allocated memory is still 169.9 MB. Free memory is still 144.1 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 348.37 ms. Allocated memory is still 169.9 MB. Free memory was 143.6 MB in the beginning and 132.8 MB in the end (delta: 10.8 MB). Peak memory consumption was 10.5 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 51.92 ms. Allocated memory is still 169.9 MB. Free memory was 132.8 MB in the beginning and 131.1 MB in the end (delta: 1.7 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 701.90 ms. Allocated memory is still 169.9 MB. Free memory was 130.8 MB in the beginning and 107.2 MB in the end (delta: 23.5 MB). Peak memory consumption was 23.1 MB. Max. memory is 8.0 GB. * TraceAbstraction took 3488.73 ms. Allocated memory was 169.9 MB in the beginning and 211.8 MB in the end (delta: 41.9 MB). Free memory was 152.3 MB in the beginning and 184.9 MB in the end (delta: -32.6 MB). Peak memory consumption was 122.5 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 9]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L42] struct slot *tmp_slot; [L43] int used_tmp_slot = 0; [L44] int freed_tmp_slot = 1; VAL [\old(freed_tmp_slot)=65, \old(tmp_slot)=61, \old(tmp_slot)=50, \old(used_tmp_slot)=64, freed_tmp_slot=1, tmp_slot={0:0}, used_tmp_slot=0] [L138] CALL ebda_rsrc_controller() VAL [\old(freed_tmp_slot)=1, \old(tmp_slot)=0, \old(tmp_slot)=0, \old(used_tmp_slot)=0, freed_tmp_slot=1, tmp_slot={0:0}, used_tmp_slot=0] [L75] struct hotplug_slot *hp_slot_ptr; [L77] struct bus_info *bus_info_ptr1; [L78] int rc; VAL [\old(freed_tmp_slot)=1, \old(tmp_slot)=0, \old(tmp_slot)=0, \old(used_tmp_slot)=0, freed_tmp_slot=1, tmp_slot={0:0}, used_tmp_slot=0] [L80] CALL, EXPR kzalloc(sizeof(*hp_slot_ptr), 1) VAL [\old(flags)=1, \old(freed_tmp_slot)=1, \old(size)=8, \old(tmp_slot)=0, \old(tmp_slot)=0, \old(used_tmp_slot)=0, freed_tmp_slot=1, tmp_slot={0:0}, used_tmp_slot=0] [L49] EXPR, FCALL calloc(1, size) VAL [\old(flags)=1, \old(freed_tmp_slot)=1, \old(size)=8, \old(tmp_slot)=0, \old(tmp_slot)=0, \old(used_tmp_slot)=0, calloc(1, size)={-1:0}, flags=1, freed_tmp_slot=1, size=8, tmp_slot={0:0}, used_tmp_slot=0] [L49] return calloc(1, size); VAL [\old(flags)=1, \old(freed_tmp_slot)=1, \old(size)=8, \old(tmp_slot)=0, \old(tmp_slot)=0, \old(used_tmp_slot)=0, \result={-1:0}, calloc(1, size)={-1:0}, flags=1, freed_tmp_slot=1, size=8, tmp_slot={0:0}, used_tmp_slot=0] [L80] RET, EXPR kzalloc(sizeof(*hp_slot_ptr), 1) VAL [\old(freed_tmp_slot)=1, \old(tmp_slot)=0, \old(tmp_slot)=0, \old(used_tmp_slot)=0, freed_tmp_slot=1, kzalloc(sizeof(*hp_slot_ptr), 1)={-1:0}, tmp_slot={0:0}, used_tmp_slot=0] [L80] hp_slot_ptr = kzalloc(sizeof(*hp_slot_ptr), 1) [L81] COND FALSE !(!hp_slot_ptr) [L85] hp_slot_ptr->b = 5 VAL [\old(freed_tmp_slot)=1, \old(tmp_slot)=0, \old(tmp_slot)=0, \old(used_tmp_slot)=0, freed_tmp_slot=1, hp_slot_ptr={-1:0}, tmp_slot={0:0}, used_tmp_slot=0] [L87] CALL, EXPR kzalloc(sizeof(*tmp_slot), 1) VAL [\old(flags)=1, \old(freed_tmp_slot)=1, \old(size)=16, \old(tmp_slot)=0, \old(tmp_slot)=0, \old(used_tmp_slot)=0, freed_tmp_slot=1, tmp_slot={0:0}, used_tmp_slot=0] [L49] EXPR, FCALL calloc(1, size) VAL [\old(flags)=1, \old(freed_tmp_slot)=1, \old(size)=16, \old(tmp_slot)=0, \old(tmp_slot)=0, \old(used_tmp_slot)=0, calloc(1, size)={-2:0}, flags=1, freed_tmp_slot=1, size=16, tmp_slot={0:0}, used_tmp_slot=0] [L49] return calloc(1, size); VAL [\old(flags)=1, \old(freed_tmp_slot)=1, \old(size)=16, \old(tmp_slot)=0, \old(tmp_slot)=0, \old(used_tmp_slot)=0, \result={-2:0}, calloc(1, size)={-2:0}, flags=1, freed_tmp_slot=1, size=16, tmp_slot={0:0}, used_tmp_slot=0] [L87] RET, EXPR kzalloc(sizeof(*tmp_slot), 1) VAL [\old(freed_tmp_slot)=1, \old(tmp_slot)=0, \old(tmp_slot)=0, \old(used_tmp_slot)=0, freed_tmp_slot=1, hp_slot_ptr={-1:0}, kzalloc(sizeof(*tmp_slot), 1)={-2:0}, tmp_slot={0:0}, used_tmp_slot=0] [L87] tmp_slot = kzalloc(sizeof(*tmp_slot), 1) [L89] COND FALSE !(!tmp_slot) [L94] used_tmp_slot = 0 [L95] freed_tmp_slot = 0 [L97] tmp_slot->a = 2 [L98] tmp_slot->b = 3 VAL [\old(freed_tmp_slot)=1, \old(tmp_slot)=0, \old(tmp_slot)=0, \old(used_tmp_slot)=0, freed_tmp_slot=0, hp_slot_ptr={-1:0}, tmp_slot={-2:0}, used_tmp_slot=0] [L100] CALL, EXPR ibmphp_find_same_bus_num() VAL [\old(freed_tmp_slot)=1, \old(tmp_slot)=0, \old(tmp_slot)=0, \old(used_tmp_slot)=0, freed_tmp_slot=0, tmp_slot={-2:0}, used_tmp_slot=0] [L58] COND TRUE __VERIFIER_nondet_int() [L59] return 0; VAL [\old(freed_tmp_slot)=1, \old(tmp_slot)=0, \old(tmp_slot)=0, \old(used_tmp_slot)=0, \result={0:0}, freed_tmp_slot=0, tmp_slot={-2:0}, used_tmp_slot=0] [L100] RET, EXPR ibmphp_find_same_bus_num() VAL [\old(freed_tmp_slot)=1, \old(tmp_slot)=0, \old(tmp_slot)=0, \old(used_tmp_slot)=0, freed_tmp_slot=0, hp_slot_ptr={-1:0}, ibmphp_find_same_bus_num()={0:0}, tmp_slot={-2:0}, used_tmp_slot=0] [L100] bus_info_ptr1 = ibmphp_find_same_bus_num() [L101] COND TRUE !bus_info_ptr1 [L102] rc = -3 VAL [\old(freed_tmp_slot)=1, \old(tmp_slot)=0, \old(tmp_slot)=0, \old(used_tmp_slot)=0, bus_info_ptr1={0:0}, freed_tmp_slot=0, hp_slot_ptr={-1:0}, rc=-3, tmp_slot={-2:0}, used_tmp_slot=0] [L129] EXPR hp_slot_ptr->private VAL [\old(freed_tmp_slot)=1, \old(tmp_slot)=0, \old(tmp_slot)=0, \old(used_tmp_slot)=0, bus_info_ptr1={0:0}, freed_tmp_slot=0, hp_slot_ptr={-1:0}, hp_slot_ptr->private={0:0}, rc=-3, tmp_slot={-2:0}, used_tmp_slot=0] [L129] CALL kfree(hp_slot_ptr->private) VAL [\old(freed_tmp_slot)=0, \old(tmp_slot)=0, \old(tmp_slot)=0, \old(used_tmp_slot)=0, freed_tmp_slot=0, p={0:0}, tmp_slot={-2:0}, used_tmp_slot=0] [L52] COND FALSE !(p!=0 && p==tmp_slot) VAL [\old(freed_tmp_slot)=0, \old(tmp_slot)=0, \old(tmp_slot)=0, \old(used_tmp_slot)=0, freed_tmp_slot=0, p={0:0}, p={0:0}, tmp_slot={-2:0}, used_tmp_slot=0] [L129] RET kfree(hp_slot_ptr->private) VAL [\old(freed_tmp_slot)=1, \old(tmp_slot)=0, \old(tmp_slot)=0, \old(used_tmp_slot)=0, bus_info_ptr1={0:0}, freed_tmp_slot=0, hp_slot_ptr={-1:0}, hp_slot_ptr->private={0:0}, rc=-3, tmp_slot={-2:0}, used_tmp_slot=0] [L134] return rc; VAL [\old(freed_tmp_slot)=1, \old(tmp_slot)=0, \old(tmp_slot)=0, \old(used_tmp_slot)=0, \result=-3, bus_info_ptr1={0:0}, freed_tmp_slot=0, hp_slot_ptr={-1:0}, rc=-3, tmp_slot={-2:0}, used_tmp_slot=0] [L138] RET ebda_rsrc_controller() VAL [\old(freed_tmp_slot)=1, \old(tmp_slot)=0, \old(tmp_slot)=0, \old(used_tmp_slot)=0, ebda_rsrc_controller()=-3, freed_tmp_slot=0, tmp_slot={-2:0}, used_tmp_slot=0] [L139] COND TRUE !used_tmp_slot VAL [\old(freed_tmp_slot)=1, \old(tmp_slot)=0, \old(tmp_slot)=0, \old(used_tmp_slot)=0, freed_tmp_slot=0, tmp_slot={-2:0}, used_tmp_slot=0] [L140] (freed_tmp_slot) ? (0) : __blast_assert () VAL [\old(freed_tmp_slot)=1, \old(tmp_slot)=0, \old(tmp_slot)=0, \old(used_tmp_slot)=0, freed_tmp_slot=0, tmp_slot={-2:0}, used_tmp_slot=0] [L140] CALL __blast_assert () VAL [\old(freed_tmp_slot)=1, \old(tmp_slot)=0, \old(tmp_slot)=0, \old(used_tmp_slot)=0, freed_tmp_slot=0, tmp_slot={-2:0}, used_tmp_slot=0] [L9] reach_error() VAL [\old(freed_tmp_slot)=1, \old(tmp_slot)=0, \old(tmp_slot)=0, \old(used_tmp_slot)=0, freed_tmp_slot=0, tmp_slot={-2:0}, used_tmp_slot=0] - StatisticsResult: Ultimate Automizer benchmark data CFG has 12 procedures, 67 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 3.3s, OverallIterations: 4, TraceHistogramMax: 2, AutomataDifference: 1.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 174 SDtfs, 208 SDslu, 436 SDs, 0 SdLazy, 521 SolverSat, 144 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.7s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 78 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 0.9s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=66occurred in iteration=2, 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, 3 MinimizatonAttempts, 10 StatesRemovedByMinimization, 3 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 1.0s InterpolantComputationTime, 165 NumberOfCodeBlocks, 165 NumberOfCodeBlocksAsserted, 4 NumberOfCheckSat, 111 ConstructedInterpolants, 0 QuantifiedInterpolants, 16795 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 3 InterpolantComputations, 3 PerfectInterpolantSequences, 16/16 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...