./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/ldv-memsafety/memset2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 6b5699aa Using bit-precise analysis Retrying with bit-precise analysis Calling Ultimate with: /usr/lib/jvm/java-8-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_d3ec6c12-255e-443e-9217-fb03bd117e02/bin/uautomizer/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/run_dir_d3ec6c12-255e-443e-9217-fb03bd117e02/bin/uautomizer/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_d3ec6c12-255e-443e-9217-fb03bd117e02/bin/uautomizer/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_d3ec6c12-255e-443e-9217-fb03bd117e02/bin/uautomizer/config/AutomizerMemDerefMemtrack.xml -i ../../sv-benchmarks/c/ldv-memsafety/memset2.c -s /tmp/vcloud-vcloud-master/worker/run_dir_d3ec6c12-255e-443e-9217-fb03bd117e02/bin/uautomizer/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_d3ec6c12-255e-443e-9217-fb03bd117e02/bin/uautomizer --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 89c40e0e226fdcfbda8631272bf2c238348d58a6 ............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- Skipped default analysis because property is memsafety ### Bit-precise run ### This is Ultimate 0.1.24-6b5699a [2019-11-25 08:56:12,396 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-25 08:56:12,398 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-25 08:56:12,407 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-25 08:56:12,407 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-25 08:56:12,408 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-25 08:56:12,409 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-25 08:56:12,411 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-25 08:56:12,413 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-25 08:56:12,414 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-25 08:56:12,415 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-25 08:56:12,416 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-25 08:56:12,416 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-25 08:56:12,417 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-25 08:56:12,418 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-25 08:56:12,419 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-25 08:56:12,420 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-25 08:56:12,421 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-25 08:56:12,422 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-25 08:56:12,424 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-25 08:56:12,426 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-25 08:56:12,427 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-25 08:56:12,428 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-25 08:56:12,429 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-25 08:56:12,431 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-11-25 08:56:12,431 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-11-25 08:56:12,432 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-11-25 08:56:12,432 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-11-25 08:56:12,433 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-11-25 08:56:12,434 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-11-25 08:56:12,434 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-11-25 08:56:12,435 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-11-25 08:56:12,435 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-11-25 08:56:12,436 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-11-25 08:56:12,437 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-11-25 08:56:12,437 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-11-25 08:56:12,438 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-11-25 08:56:12,438 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-11-25 08:56:12,438 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-25 08:56:12,439 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-25 08:56:12,440 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-25 08:56:12,440 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_d3ec6c12-255e-443e-9217-fb03bd117e02/bin/uautomizer/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Bitvector.epf [2019-11-25 08:56:12,453 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-25 08:56:12,453 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-25 08:56:12,454 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-25 08:56:12,454 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-25 08:56:12,454 INFO L138 SettingsManager]: * Use SBE=true [2019-11-25 08:56:12,455 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-25 08:56:12,455 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-25 08:56:12,455 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2019-11-25 08:56:12,455 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-25 08:56:12,455 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-25 08:56:12,455 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-25 08:56:12,456 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2019-11-25 08:56:12,456 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2019-11-25 08:56:12,456 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2019-11-25 08:56:12,456 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-25 08:56:12,456 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2019-11-25 08:56:12,456 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2019-11-25 08:56:12,457 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2019-11-25 08:56:12,457 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-25 08:56:12,457 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-25 08:56:12,457 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-25 08:56:12,457 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-25 08:56:12,458 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-25 08:56:12,458 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-25 08:56:12,458 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-25 08:56:12,458 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-25 08:56:12,458 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-25 08:56:12,459 INFO L138 SettingsManager]: * Trace refinement strategy=WOLF [2019-11-25 08:56:12,459 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --rewrite-divk --print-success --lang smt [2019-11-25 08:56:12,459 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-25 08:56:12,459 INFO L138 SettingsManager]: * Logic for external solver=AUFBV Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_d3ec6c12-255e-443e-9217-fb03bd117e02/bin/uautomizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 89c40e0e226fdcfbda8631272bf2c238348d58a6 [2019-11-25 08:56:12,596 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-25 08:56:12,606 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-25 08:56:12,608 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-25 08:56:12,610 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-25 08:56:12,610 INFO L275 PluginConnector]: CDTParser initialized [2019-11-25 08:56:12,611 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_d3ec6c12-255e-443e-9217-fb03bd117e02/bin/uautomizer/../../sv-benchmarks/c/ldv-memsafety/memset2.c [2019-11-25 08:56:12,664 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_d3ec6c12-255e-443e-9217-fb03bd117e02/bin/uautomizer/data/ac0abb431/5e04a31dcc184702bccd2990c722cc33/FLAG288d58cd2 [2019-11-25 08:56:13,086 INFO L306 CDTParser]: Found 1 translation units. [2019-11-25 08:56:13,086 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_d3ec6c12-255e-443e-9217-fb03bd117e02/sv-benchmarks/c/ldv-memsafety/memset2.c [2019-11-25 08:56:13,092 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_d3ec6c12-255e-443e-9217-fb03bd117e02/bin/uautomizer/data/ac0abb431/5e04a31dcc184702bccd2990c722cc33/FLAG288d58cd2 [2019-11-25 08:56:13,105 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_d3ec6c12-255e-443e-9217-fb03bd117e02/bin/uautomizer/data/ac0abb431/5e04a31dcc184702bccd2990c722cc33 [2019-11-25 08:56:13,109 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-25 08:56:13,110 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2019-11-25 08:56:13,114 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-25 08:56:13,115 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-25 08:56:13,118 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-25 08:56:13,118 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:56:13" (1/1) ... [2019-11-25 08:56:13,121 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6400364 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:56:13, skipping insertion in model container [2019-11-25 08:56:13,121 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:56:13" (1/1) ... [2019-11-25 08:56:13,130 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2019-11-25 08:56:13,147 INFO L179 MainTranslator]: Built tables and reachable declarations [2019-11-25 08:56:13,278 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-25 08:56:13,357 INFO L201 MainTranslator]: Completed pre-run [2019-11-25 08:56:13,384 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-25 08:56:13,397 INFO L205 MainTranslator]: Completed translation [2019-11-25 08:56:13,398 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:56:13 WrapperNode [2019-11-25 08:56:13,398 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-25 08:56:13,398 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-25 08:56:13,399 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-25 08:56:13,399 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-25 08:56:13,410 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:56:13" (1/1) ... [2019-11-25 08:56:13,410 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:56:13" (1/1) ... [2019-11-25 08:56:13,418 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:56:13" (1/1) ... [2019-11-25 08:56:13,419 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:56:13" (1/1) ... [2019-11-25 08:56:13,425 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:56:13" (1/1) ... [2019-11-25 08:56:13,429 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:56:13" (1/1) ... [2019-11-25 08:56:13,430 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:56:13" (1/1) ... [2019-11-25 08:56:13,432 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-25 08:56:13,432 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-25 08:56:13,432 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-25 08:56:13,432 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-25 08:56:13,433 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:56:13" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_d3ec6c12-255e-443e-9217-fb03bd117e02/bin/uautomizer/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-25 08:56:13,491 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-25 08:56:13,492 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-25 08:56:13,492 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.setCurrentRoundingMode [2019-11-25 08:56:13,492 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-25 08:56:13,492 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.C_memset [2019-11-25 08:56:13,493 INFO L130 BoogieDeclarations]: Found specification of procedure memset [2019-11-25 08:56:13,493 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-25 08:56:13,493 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-25 08:56:13,494 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.C_memset [2019-11-25 08:56:13,494 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-25 08:56:13,494 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-25 08:56:13,494 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-25 08:56:13,494 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.setCurrentRoundingMode [2019-11-25 08:56:13,729 WARN L735 $ProcedureCfgBuilder]: Label in the middle of a codeblock. [2019-11-25 08:56:13,834 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-25 08:56:13,834 INFO L284 CfgBuilder]: Removed 0 assume(true) statements. [2019-11-25 08:56:13,835 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:56:13 BoogieIcfgContainer [2019-11-25 08:56:13,835 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-25 08:56:13,836 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-25 08:56:13,836 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-25 08:56:13,840 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-25 08:56:13,840 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 08:56:13" (1/3) ... [2019-11-25 08:56:13,842 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@688e7bc2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:56:13, skipping insertion in model container [2019-11-25 08:56:13,842 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:56:13" (2/3) ... [2019-11-25 08:56:13,843 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@688e7bc2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:56:13, skipping insertion in model container [2019-11-25 08:56:13,843 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:56:13" (3/3) ... [2019-11-25 08:56:13,845 INFO L109 eAbstractionObserver]: Analyzing ICFG memset2.c [2019-11-25 08:56:13,854 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-25 08:56:13,863 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 3 error locations. [2019-11-25 08:56:13,875 INFO L249 AbstractCegarLoop]: Starting to check reachability of 3 error locations. [2019-11-25 08:56:13,905 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-25 08:56:13,905 INFO L374 AbstractCegarLoop]: Hoare is false [2019-11-25 08:56:13,905 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-25 08:56:13,906 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-25 08:56:13,906 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-25 08:56:13,906 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-25 08:56:13,906 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-25 08:56:13,906 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-25 08:56:13,922 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2019-11-25 08:56:13,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2019-11-25 08:56:13,933 INFO L402 BasicCegarLoop]: Found error trace [2019-11-25 08:56:13,933 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2019-11-25 08:56:13,934 INFO L410 AbstractCegarLoop]: === Iteration 1 === [mainErr2ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION]=== [2019-11-25 08:56:13,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-25 08:56:13,938 INFO L82 PathProgramCache]: Analyzing trace with hash 1903200462, now seen corresponding path program 1 times [2019-11-25 08:56:13,948 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-25 08:56:13,948 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [812917135] [2019-11-25 08:56:13,949 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_d3ec6c12-255e-443e-9217-fb03bd117e02/bin/uautomizer/cvc4 Starting monitored process 2 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-25 08:56:14,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-25 08:56:14,025 INFO L255 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 2 conjunts are in the unsatisfiable core [2019-11-25 08:56:14,030 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-25 08:56:14,078 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-11-25 08:56:14,079 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-25 08:56:14,086 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-25 08:56:14,086 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-25 08:56:14,086 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:6, output treesize:5 [2019-11-25 08:56:14,096 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-25 08:56:14,096 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-25 08:56:14,115 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-25 08:56:14,116 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [812917135] [2019-11-25 08:56:14,117 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-25 08:56:14,117 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2019-11-25 08:56:14,119 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1228479267] [2019-11-25 08:56:14,123 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-25 08:56:14,123 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-25 08:56:14,134 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-25 08:56:14,135 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-25 08:56:14,136 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 3 states. [2019-11-25 08:56:14,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-25 08:56:14,176 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2019-11-25 08:56:14,176 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-25 08:56:14,177 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 7 [2019-11-25 08:56:14,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-25 08:56:14,185 INFO L225 Difference]: With dead ends: 19 [2019-11-25 08:56:14,185 INFO L226 Difference]: Without dead ends: 16 [2019-11-25 08:56:14,187 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-25 08:56:14,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2019-11-25 08:56:14,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2019-11-25 08:56:14,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2019-11-25 08:56:14,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2019-11-25 08:56:14,218 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 7 [2019-11-25 08:56:14,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-25 08:56:14,218 INFO L462 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2019-11-25 08:56:14,218 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-25 08:56:14,218 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2019-11-25 08:56:14,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2019-11-25 08:56:14,219 INFO L402 BasicCegarLoop]: Found error trace [2019-11-25 08:56:14,219 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2019-11-25 08:56:14,429 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-25 08:56:14,430 INFO L410 AbstractCegarLoop]: === Iteration 2 === [mainErr2ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION]=== [2019-11-25 08:56:14,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-25 08:56:14,430 INFO L82 PathProgramCache]: Analyzing trace with hash 1903200463, now seen corresponding path program 1 times [2019-11-25 08:56:14,430 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-25 08:56:14,430 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [550297290] [2019-11-25 08:56:14,431 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_d3ec6c12-255e-443e-9217-fb03bd117e02/bin/uautomizer/cvc4 Starting monitored process 3 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-25 08:56:14,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-25 08:56:14,492 INFO L255 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-25 08:56:14,493 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-25 08:56:14,509 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-11-25 08:56:14,510 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-25 08:56:14,518 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-25 08:56:14,519 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-25 08:56:14,519 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:10, output treesize:9 [2019-11-25 08:56:14,528 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-25 08:56:14,528 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-25 08:56:14,573 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-25 08:56:14,573 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [550297290] [2019-11-25 08:56:14,574 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-25 08:56:14,574 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 3 [2019-11-25 08:56:14,574 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [48954866] [2019-11-25 08:56:14,575 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-25 08:56:14,575 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-25 08:56:14,576 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-25 08:56:14,576 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-25 08:56:14,576 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 4 states. [2019-11-25 08:56:14,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-25 08:56:14,614 INFO L93 Difference]: Finished difference Result 15 states and 15 transitions. [2019-11-25 08:56:14,614 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-25 08:56:14,615 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 7 [2019-11-25 08:56:14,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-25 08:56:14,615 INFO L225 Difference]: With dead ends: 15 [2019-11-25 08:56:14,615 INFO L226 Difference]: Without dead ends: 15 [2019-11-25 08:56:14,616 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-25 08:56:14,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2019-11-25 08:56:14,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2019-11-25 08:56:14,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2019-11-25 08:56:14,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2019-11-25 08:56:14,620 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 7 [2019-11-25 08:56:14,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-25 08:56:14,620 INFO L462 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2019-11-25 08:56:14,621 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-25 08:56:14,621 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2019-11-25 08:56:14,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-11-25 08:56:14,621 INFO L402 BasicCegarLoop]: Found error trace [2019-11-25 08:56:14,622 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-25 08:56:14,823 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-25 08:56:14,824 INFO L410 AbstractCegarLoop]: === Iteration 3 === [mainErr2ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION]=== [2019-11-25 08:56:14,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-25 08:56:14,824 INFO L82 PathProgramCache]: Analyzing trace with hash 277215897, now seen corresponding path program 1 times [2019-11-25 08:56:14,825 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-25 08:56:14,825 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [1924213445] [2019-11-25 08:56:14,825 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_d3ec6c12-255e-443e-9217-fb03bd117e02/bin/uautomizer/cvc4 Starting monitored process 4 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-25 08:56:14,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-25 08:56:14,891 INFO L255 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-25 08:56:14,892 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-25 08:56:14,916 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-25 08:56:14,917 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-25 08:56:14,982 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-25 08:56:14,982 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1924213445] [2019-11-25 08:56:14,982 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-25 08:56:14,983 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2019-11-25 08:56:14,983 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [562913410] [2019-11-25 08:56:14,983 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-25 08:56:14,983 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-25 08:56:14,984 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-25 08:56:14,984 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2019-11-25 08:56:14,984 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 6 states. [2019-11-25 08:56:15,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-25 08:56:15,029 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2019-11-25 08:56:15,030 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-25 08:56:15,030 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 14 [2019-11-25 08:56:15,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-25 08:56:15,031 INFO L225 Difference]: With dead ends: 21 [2019-11-25 08:56:15,031 INFO L226 Difference]: Without dead ends: 17 [2019-11-25 08:56:15,032 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=23, Unknown=0, NotChecked=0, Total=42 [2019-11-25 08:56:15,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2019-11-25 08:56:15,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2019-11-25 08:56:15,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2019-11-25 08:56:15,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2019-11-25 08:56:15,036 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 14 [2019-11-25 08:56:15,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-25 08:56:15,036 INFO L462 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2019-11-25 08:56:15,036 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-25 08:56:15,036 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2019-11-25 08:56:15,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-11-25 08:56:15,037 INFO L402 BasicCegarLoop]: Found error trace [2019-11-25 08:56:15,037 INFO L410 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-25 08:56:15,239 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-25 08:56:15,239 INFO L410 AbstractCegarLoop]: === Iteration 4 === [mainErr2ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION]=== [2019-11-25 08:56:15,240 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-25 08:56:15,240 INFO L82 PathProgramCache]: Analyzing trace with hash -1760321287, now seen corresponding path program 1 times [2019-11-25 08:56:15,240 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-25 08:56:15,241 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [698800697] [2019-11-25 08:56:15,241 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_d3ec6c12-255e-443e-9217-fb03bd117e02/bin/uautomizer/cvc4 Starting monitored process 5 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-25 08:56:15,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-25 08:56:15,322 INFO L255 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-25 08:56:15,323 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-25 08:56:15,386 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-25 08:56:15,386 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-25 08:56:15,561 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-25 08:56:15,561 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [698800697] [2019-11-25 08:56:15,562 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-25 08:56:15,562 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 10 [2019-11-25 08:56:15,562 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [80230858] [2019-11-25 08:56:15,563 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-11-25 08:56:15,563 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-25 08:56:15,563 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-11-25 08:56:15,563 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2019-11-25 08:56:15,564 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 10 states. [2019-11-25 08:56:15,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-25 08:56:15,793 INFO L93 Difference]: Finished difference Result 25 states and 27 transitions. [2019-11-25 08:56:15,794 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-11-25 08:56:15,795 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 16 [2019-11-25 08:56:15,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-25 08:56:15,796 INFO L225 Difference]: With dead ends: 25 [2019-11-25 08:56:15,796 INFO L226 Difference]: Without dead ends: 21 [2019-11-25 08:56:15,796 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=63, Invalid=93, Unknown=0, NotChecked=0, Total=156 [2019-11-25 08:56:15,797 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2019-11-25 08:56:15,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2019-11-25 08:56:15,799 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-11-25 08:56:15,800 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2019-11-25 08:56:15,800 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 16 [2019-11-25 08:56:15,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-25 08:56:15,801 INFO L462 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2019-11-25 08:56:15,801 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-11-25 08:56:15,801 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2019-11-25 08:56:15,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-11-25 08:56:15,802 INFO L402 BasicCegarLoop]: Found error trace [2019-11-25 08:56:15,802 INFO L410 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-25 08:56:16,007 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-25 08:56:16,008 INFO L410 AbstractCegarLoop]: === Iteration 5 === [mainErr2ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION]=== [2019-11-25 08:56:16,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-25 08:56:16,008 INFO L82 PathProgramCache]: Analyzing trace with hash 1365550521, now seen corresponding path program 2 times [2019-11-25 08:56:16,009 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-25 08:56:16,009 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [744355709] [2019-11-25 08:56:16,009 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_d3ec6c12-255e-443e-9217-fb03bd117e02/bin/uautomizer/cvc4 Starting monitored process 6 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-25 08:56:16,094 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2019-11-25 08:56:16,094 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-25 08:56:16,095 INFO L255 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 7 conjunts are in the unsatisfiable core [2019-11-25 08:56:16,097 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-25 08:56:16,110 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-11-25 08:56:16,110 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-25 08:56:16,117 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-25 08:56:16,118 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-25 08:56:16,118 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:6, output treesize:5 [2019-11-25 08:56:16,195 INFO L343 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2019-11-25 08:56:16,195 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 39 [2019-11-25 08:56:16,196 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-25 08:56:16,216 INFO L567 ElimStorePlain]: treesize reduction 10, result has 60.0 percent of original size [2019-11-25 08:56:16,217 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-25 08:56:16,220 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2019-11-25 08:56:16,220 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:17, output treesize:15 [2019-11-25 08:56:16,221 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-25 08:56:16,244 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-25 08:56:16,255 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-25 08:56:16,267 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-25 08:56:16,280 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-25 08:56:16,301 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-25 08:56:16,315 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-25 08:56:16,328 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-25 08:56:16,346 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-25 08:56:16,362 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-25 08:56:16,381 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-25 08:56:16,395 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-25 08:56:16,424 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-11-25 08:56:16,424 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-25 08:56:18,531 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-11-25 08:56:18,531 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [744355709] [2019-11-25 08:56:18,532 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-25 08:56:18,532 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 4] imperfect sequences [] total 8 [2019-11-25 08:56:18,532 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1314861218] [2019-11-25 08:56:18,533 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-11-25 08:56:18,533 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-25 08:56:18,533 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-11-25 08:56:18,533 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=50, Unknown=1, NotChecked=0, Total=72 [2019-11-25 08:56:18,534 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 9 states. [2019-11-25 08:56:18,680 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-25 08:56:18,680 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2019-11-25 08:56:18,680 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-25 08:56:18,680 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 20 [2019-11-25 08:56:18,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-25 08:56:18,681 INFO L225 Difference]: With dead ends: 20 [2019-11-25 08:56:18,681 INFO L226 Difference]: Without dead ends: 0 [2019-11-25 08:56:18,682 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 20 SyntacticMatches, 12 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=34, Invalid=75, Unknown=1, NotChecked=0, Total=110 [2019-11-25 08:56:18,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2019-11-25 08:56:18,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2019-11-25 08:56:18,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2019-11-25 08:56:18,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2019-11-25 08:56:18,683 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 20 [2019-11-25 08:56:18,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-25 08:56:18,683 INFO L462 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2019-11-25 08:56:18,683 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-11-25 08:56:18,683 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2019-11-25 08:56:18,683 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2019-11-25 08:56:18,885 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-25 08:56:18,890 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 25.11 08:56:18 BoogieIcfgContainer [2019-11-25 08:56:18,891 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-11-25 08:56:18,891 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2019-11-25 08:56:18,891 INFO L271 PluginConnector]: Initializing Witness Printer... [2019-11-25 08:56:18,892 INFO L275 PluginConnector]: Witness Printer initialized [2019-11-25 08:56:18,892 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:56:13" (3/4) ... [2019-11-25 08:56:18,897 INFO L137 WitnessPrinter]: Generating witness for correct program [2019-11-25 08:56:18,907 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure ULTIMATE.setCurrentRoundingMode [2019-11-25 08:56:18,909 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure ULTIMATE.init [2019-11-25 08:56:18,909 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure #Ultimate.C_memset [2019-11-25 08:56:18,910 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure main [2019-11-25 08:56:18,917 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 12 nodes and edges [2019-11-25 08:56:18,917 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 6 nodes and edges [2019-11-25 08:56:18,918 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 2 nodes and edges [2019-11-25 08:56:18,918 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 2 nodes and edges [2019-11-25 08:56:18,948 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_d3ec6c12-255e-443e-9217-fb03bd117e02/bin/uautomizer/witness.graphml [2019-11-25 08:56:18,948 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2019-11-25 08:56:18,949 INFO L168 Benchmark]: Toolchain (without parser) took 5839.44 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 136.8 MB). Free memory was 950.1 MB in the beginning and 936.5 MB in the end (delta: 13.7 MB). Peak memory consumption was 150.5 MB. Max. memory is 11.5 GB. [2019-11-25 08:56:18,950 INFO L168 Benchmark]: CDTParser took 0.19 ms. Allocated memory is still 1.0 GB. Free memory is still 967.6 MB. There was no memory consumed. Max. memory is 11.5 GB. [2019-11-25 08:56:18,951 INFO L168 Benchmark]: CACSL2BoogieTranslator took 283.94 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 136.8 MB). Free memory was 950.1 MB in the beginning and 1.1 GB in the end (delta: -181.6 MB). Peak memory consumption was 23.1 MB. Max. memory is 11.5 GB. [2019-11-25 08:56:18,951 INFO L168 Benchmark]: Boogie Preprocessor took 33.52 ms. Allocated memory is still 1.2 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. [2019-11-25 08:56:18,951 INFO L168 Benchmark]: RCFGBuilder took 402.91 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 23.7 MB). Peak memory consumption was 23.7 MB. Max. memory is 11.5 GB. [2019-11-25 08:56:18,952 INFO L168 Benchmark]: TraceAbstraction took 5054.97 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 941.8 MB in the end (delta: 166.2 MB). Peak memory consumption was 166.2 MB. Max. memory is 11.5 GB. [2019-11-25 08:56:18,953 INFO L168 Benchmark]: Witness Printer took 56.76 ms. Allocated memory is still 1.2 GB. Free memory was 941.8 MB in the beginning and 936.5 MB in the end (delta: 5.4 MB). Peak memory consumption was 5.4 MB. Max. memory is 11.5 GB. [2019-11-25 08:56:18,955 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.19 ms. Allocated memory is still 1.0 GB. Free memory is still 967.6 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 283.94 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 136.8 MB). Free memory was 950.1 MB in the beginning and 1.1 GB in the end (delta: -181.6 MB). Peak memory consumption was 23.1 MB. Max. memory is 11.5 GB. * Boogie Preprocessor took 33.52 ms. Allocated memory is still 1.2 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. * RCFGBuilder took 402.91 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 23.7 MB). Peak memory consumption was 23.7 MB. Max. memory is 11.5 GB. * TraceAbstraction took 5054.97 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 941.8 MB in the end (delta: 166.2 MB). Peak memory consumption was 166.2 MB. Max. memory is 11.5 GB. * Witness Printer took 56.76 ms. Allocated memory is still 1.2 GB. Free memory was 941.8 MB in the beginning and 936.5 MB in the end (delta: 5.4 MB). Peak memory consumption was 5.4 MB. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 20]: all allocated memory was freed For all program executions holds that all allocated memory was freed at this location - PositiveResult [Line: 22]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 22]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - AllSpecificationsHoldResult: All specifications hold 3 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 26 locations, 3 error locations. Result: SAFE, OverallTime: 4.9s, OverallIterations: 5, TraceHistogramMax: 6, AutomataDifference: 0.5s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, HoareTripleCheckerStatistics: 66 SDtfs, 27 SDslu, 116 SDs, 0 SdLazy, 94 SolverSat, 20 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 129 GetRequests, 87 SyntacticMatches, 14 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 2.7s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=21occurred in iteration=4, 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, 5 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 2.9s InterpolantComputationTime, 64 NumberOfCodeBlocks, 58 NumberOfCodeBlocksAsserted, 5 NumberOfCheckSat, 118 ConstructedInterpolants, 12 QuantifiedInterpolants, 7820 SizeOfPredicates, 3 NumberOfNonLiveVariables, 208 ConjunctsInSsa, 20 ConjunctsInUnsatCore, 10 InterpolantComputations, 8 PerfectInterpolantSequences, 42/48 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...