./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/cstrlen_unsafe.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 7b2dab56 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_ab4b390b-26a1-422a-adc8-8d829f99852c/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_ab4b390b-26a1-422a-adc8-8d829f99852c/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_ab4b390b-26a1-422a-adc8-8d829f99852c/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_ab4b390b-26a1-422a-adc8-8d829f99852c/bin/utaipan/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/cstrlen_unsafe.i -s /tmp/vcloud-vcloud-master/worker/run_dir_ab4b390b-26a1-422a-adc8-8d829f99852c/bin/utaipan/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_ab4b390b-26a1-422a-adc8-8d829f99852c/bin/utaipan --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 Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 15362e3354379e86b7768de02eb760f50ed72879 ............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE(valid-deref) --- Real Ultimate output --- This is Ultimate 0.2.0-7b2dab5 [2020-12-03 12:36:57,869 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-03 12:36:57,880 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-03 12:36:57,934 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-03 12:36:57,934 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-03 12:36:57,936 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-03 12:36:57,938 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-03 12:36:57,941 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-03 12:36:57,943 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-03 12:36:57,945 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-03 12:36:57,946 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-03 12:36:57,948 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-03 12:36:57,948 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-03 12:36:57,950 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-03 12:36:57,952 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-03 12:36:57,957 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-03 12:36:57,960 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-03 12:36:57,963 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-03 12:36:57,966 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-03 12:36:57,972 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-03 12:36:57,979 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-03 12:36:57,981 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-03 12:36:57,983 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-03 12:36:57,984 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-03 12:36:57,991 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-12-03 12:36:57,993 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-12-03 12:36:57,993 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-12-03 12:36:57,996 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-12-03 12:36:57,997 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-12-03 12:36:57,998 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-12-03 12:36:57,999 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-12-03 12:36:58,000 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-12-03 12:36:58,002 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-12-03 12:36:58,004 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-12-03 12:36:58,005 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-12-03 12:36:58,006 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-12-03 12:36:58,007 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-12-03 12:36:58,007 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-12-03 12:36:58,008 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-03 12:36:58,009 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-03 12:36:58,009 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-03 12:36:58,012 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_ab4b390b-26a1-422a-adc8-8d829f99852c/bin/utaipan/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2020-12-03 12:36:58,054 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-03 12:36:58,054 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-03 12:36:58,056 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-12-03 12:36:58,057 INFO L138 SettingsManager]: * User list type=DISABLED [2020-12-03 12:36:58,057 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-12-03 12:36:58,057 INFO L138 SettingsManager]: * Explicit value domain=true [2020-12-03 12:36:58,057 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-12-03 12:36:58,058 INFO L138 SettingsManager]: * Octagon Domain=false [2020-12-03 12:36:58,058 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-12-03 12:36:58,058 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-12-03 12:36:58,059 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-12-03 12:36:58,060 INFO L138 SettingsManager]: * Interval Domain=false [2020-12-03 12:36:58,060 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-12-03 12:36:58,060 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-12-03 12:36:58,060 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-12-03 12:36:58,061 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-03 12:36:58,061 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-03 12:36:58,062 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-03 12:36:58,062 INFO L138 SettingsManager]: * sizeof long=4 [2020-12-03 12:36:58,062 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2020-12-03 12:36:58,062 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-03 12:36:58,063 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-12-03 12:36:58,063 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-03 12:36:58,063 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2020-12-03 12:36:58,063 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2020-12-03 12:36:58,064 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2020-12-03 12:36:58,065 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-03 12:36:58,066 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-12-03 12:36:58,066 INFO L138 SettingsManager]: * sizeof long double=12 [2020-12-03 12:36:58,066 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-03 12:36:58,066 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-03 12:36:58,067 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-03 12:36:58,067 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-03 12:36:58,067 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-03 12:36:58,068 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-03 12:36:58,068 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-12-03 12:36:58,068 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-03 12:36:58,068 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-03 12:36:58,069 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-12-03 12:36:58,069 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud-vcloud-master/worker/run_dir_ab4b390b-26a1-422a-adc8-8d829f99852c/bin/utaipan/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_ab4b390b-26a1-422a-adc8-8d829f99852c/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 15362e3354379e86b7768de02eb760f50ed72879 [2020-12-03 12:36:58,335 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-03 12:36:58,357 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-03 12:36:58,359 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-03 12:36:58,361 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-03 12:36:58,365 INFO L275 PluginConnector]: CDTParser initialized [2020-12-03 12:36:58,366 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_ab4b390b-26a1-422a-adc8-8d829f99852c/bin/utaipan/../../sv-benchmarks/c/array-memsafety/cstrlen_unsafe.i [2020-12-03 12:36:58,441 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_ab4b390b-26a1-422a-adc8-8d829f99852c/bin/utaipan/data/5109842af/9f6964b389754862880eb7e00eca7e39/FLAGc44f455c9 [2020-12-03 12:36:59,012 INFO L306 CDTParser]: Found 1 translation units. [2020-12-03 12:36:59,012 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_ab4b390b-26a1-422a-adc8-8d829f99852c/sv-benchmarks/c/array-memsafety/cstrlen_unsafe.i [2020-12-03 12:36:59,025 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_ab4b390b-26a1-422a-adc8-8d829f99852c/bin/utaipan/data/5109842af/9f6964b389754862880eb7e00eca7e39/FLAGc44f455c9 [2020-12-03 12:36:59,286 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_ab4b390b-26a1-422a-adc8-8d829f99852c/bin/utaipan/data/5109842af/9f6964b389754862880eb7e00eca7e39 [2020-12-03 12:36:59,288 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-03 12:36:59,289 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-03 12:36:59,294 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-03 12:36:59,294 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-03 12:36:59,301 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-03 12:36:59,302 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.12 12:36:59" (1/1) ... [2020-12-03 12:36:59,304 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@46727725 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:36:59, skipping insertion in model container [2020-12-03 12:36:59,304 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.12 12:36:59" (1/1) ... [2020-12-03 12:36:59,310 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-03 12:36:59,349 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-03 12:36:59,637 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-03 12:36:59,644 INFO L203 MainTranslator]: Completed pre-run [2020-12-03 12:36:59,697 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-03 12:36:59,742 INFO L208 MainTranslator]: Completed translation [2020-12-03 12:36:59,743 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:36:59 WrapperNode [2020-12-03 12:36:59,743 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-03 12:36:59,744 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-03 12:36:59,745 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-03 12:36:59,745 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-03 12:36:59,752 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:36:59" (1/1) ... [2020-12-03 12:36:59,765 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:36:59" (1/1) ... [2020-12-03 12:36:59,785 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-03 12:36:59,786 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-03 12:36:59,786 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-03 12:36:59,786 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-03 12:36:59,794 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:36:59" (1/1) ... [2020-12-03 12:36:59,794 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:36:59" (1/1) ... [2020-12-03 12:36:59,797 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:36:59" (1/1) ... [2020-12-03 12:36:59,798 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:36:59" (1/1) ... [2020-12-03 12:36:59,803 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:36:59" (1/1) ... [2020-12-03 12:36:59,807 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:36:59" (1/1) ... [2020-12-03 12:36:59,809 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:36:59" (1/1) ... [2020-12-03 12:36:59,811 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-03 12:36:59,812 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-03 12:36:59,813 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-03 12:36:59,813 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-03 12:36:59,819 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:36:59" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_ab4b390b-26a1-422a-adc8-8d829f99852c/bin/utaipan/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-03 12:36:59,926 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-12-03 12:36:59,927 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-12-03 12:36:59,927 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-12-03 12:36:59,927 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-12-03 12:36:59,927 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-03 12:36:59,927 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-03 12:37:00,456 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-03 12:37:00,456 INFO L299 CfgBuilder]: Removed 10 assume(true) statements. [2020-12-03 12:37:00,458 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 12:37:00 BoogieIcfgContainer [2020-12-03 12:37:00,459 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-03 12:37:00,460 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-03 12:37:00,461 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-03 12:37:00,464 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-03 12:37:00,465 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.12 12:36:59" (1/3) ... [2020-12-03 12:37:00,465 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3394e11f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.12 12:37:00, skipping insertion in model container [2020-12-03 12:37:00,466 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:36:59" (2/3) ... [2020-12-03 12:37:00,466 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3394e11f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.12 12:37:00, skipping insertion in model container [2020-12-03 12:37:00,466 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 12:37:00" (3/3) ... [2020-12-03 12:37:00,468 INFO L111 eAbstractionObserver]: Analyzing ICFG cstrlen_unsafe.i [2020-12-03 12:37:00,480 INFO L180 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-03 12:37:00,483 INFO L192 ceAbstractionStarter]: Appying trace abstraction to program that has 10 error locations. [2020-12-03 12:37:00,496 INFO L253 AbstractCegarLoop]: Starting to check reachability of 10 error locations. [2020-12-03 12:37:00,537 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-03 12:37:00,537 INFO L378 AbstractCegarLoop]: Hoare is false [2020-12-03 12:37:00,537 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-03 12:37:00,537 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-03 12:37:00,538 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-03 12:37:00,538 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-03 12:37:00,538 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-03 12:37:00,538 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-03 12:37:00,554 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2020-12-03 12:37:00,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2020-12-03 12:37:00,559 INFO L414 BasicCegarLoop]: Found error trace [2020-12-03 12:37:00,560 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1] [2020-12-03 12:37:00,560 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr7ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr8ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr9ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-12-03 12:37:00,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-03 12:37:00,566 INFO L82 PathProgramCache]: Analyzing trace with hash 97607, now seen corresponding path program 1 times [2020-12-03 12:37:00,573 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-03 12:37:00,574 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1592847888] [2020-12-03 12:37:00,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-03 12:37:00,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:37:00,716 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-03 12:37:00,717 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1592847888] [2020-12-03 12:37:00,718 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-03 12:37:00,718 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2020-12-03 12:37:00,719 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1296790595] [2020-12-03 12:37:00,723 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-03 12:37:00,724 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-03 12:37:00,737 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-03 12:37:00,738 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-03 12:37:00,740 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 3 states. [2020-12-03 12:37:00,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-03 12:37:00,779 INFO L93 Difference]: Finished difference Result 20 states and 21 transitions. [2020-12-03 12:37:00,780 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-03 12:37:00,781 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 3 [2020-12-03 12:37:00,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-03 12:37:00,789 INFO L225 Difference]: With dead ends: 20 [2020-12-03 12:37:00,790 INFO L226 Difference]: Without dead ends: 19 [2020-12-03 12:37:00,791 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-03 12:37:00,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-12-03 12:37:00,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-12-03 12:37:00,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-12-03 12:37:00,816 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2020-12-03 12:37:00,818 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 3 [2020-12-03 12:37:00,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-03 12:37:00,818 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2020-12-03 12:37:00,818 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-03 12:37:00,818 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2020-12-03 12:37:00,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2020-12-03 12:37:00,819 INFO L414 BasicCegarLoop]: Found error trace [2020-12-03 12:37:00,819 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1] [2020-12-03 12:37:00,819 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-03 12:37:00,819 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr7ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr8ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr9ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-12-03 12:37:00,820 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-03 12:37:00,820 INFO L82 PathProgramCache]: Analyzing trace with hash 97608, now seen corresponding path program 1 times [2020-12-03 12:37:00,821 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-03 12:37:00,821 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [193367391] [2020-12-03 12:37:00,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-03 12:37:00,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:37:00,889 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-03 12:37:00,890 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [193367391] [2020-12-03 12:37:00,890 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-03 12:37:00,890 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-12-03 12:37:00,890 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1115528512] [2020-12-03 12:37:00,891 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-12-03 12:37:00,892 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-03 12:37:00,892 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-12-03 12:37:00,893 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-12-03 12:37:00,893 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand 4 states. [2020-12-03 12:37:00,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-03 12:37:00,953 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2020-12-03 12:37:00,954 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-03 12:37:00,954 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 3 [2020-12-03 12:37:00,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-03 12:37:00,955 INFO L225 Difference]: With dead ends: 36 [2020-12-03 12:37:00,955 INFO L226 Difference]: Without dead ends: 36 [2020-12-03 12:37:00,956 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-12-03 12:37:00,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-12-03 12:37:00,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 21. [2020-12-03 12:37:00,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-12-03 12:37:00,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2020-12-03 12:37:00,961 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 3 [2020-12-03 12:37:00,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-03 12:37:00,961 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2020-12-03 12:37:00,962 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-12-03 12:37:00,962 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2020-12-03 12:37:00,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2020-12-03 12:37:00,962 INFO L414 BasicCegarLoop]: Found error trace [2020-12-03 12:37:00,962 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1] [2020-12-03 12:37:00,963 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-12-03 12:37:00,963 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr7ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr8ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr9ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-12-03 12:37:00,963 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-03 12:37:00,964 INFO L82 PathProgramCache]: Analyzing trace with hash 99291, now seen corresponding path program 1 times [2020-12-03 12:37:00,964 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-03 12:37:00,964 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1651941827] [2020-12-03 12:37:00,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-03 12:37:00,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:37:01,035 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-03 12:37:01,036 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1651941827] [2020-12-03 12:37:01,036 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-03 12:37:01,036 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2020-12-03 12:37:01,037 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [686284754] [2020-12-03 12:37:01,037 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-03 12:37:01,037 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-03 12:37:01,038 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-03 12:37:01,038 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-03 12:37:01,038 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 3 states. [2020-12-03 12:37:01,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-03 12:37:01,059 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2020-12-03 12:37:01,060 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-03 12:37:01,060 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 3 [2020-12-03 12:37:01,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-03 12:37:01,062 INFO L225 Difference]: With dead ends: 20 [2020-12-03 12:37:01,064 INFO L226 Difference]: Without dead ends: 20 [2020-12-03 12:37:01,065 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-03 12:37:01,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-12-03 12:37:01,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-12-03 12:37:01,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-12-03 12:37:01,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2020-12-03 12:37:01,072 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 3 [2020-12-03 12:37:01,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-03 12:37:01,073 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2020-12-03 12:37:01,073 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-03 12:37:01,073 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2020-12-03 12:37:01,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2020-12-03 12:37:01,074 INFO L414 BasicCegarLoop]: Found error trace [2020-12-03 12:37:01,074 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2020-12-03 12:37:01,074 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-12-03 12:37:01,074 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr7ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr8ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr9ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-12-03 12:37:01,075 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-03 12:37:01,075 INFO L82 PathProgramCache]: Analyzing trace with hash 3079237, now seen corresponding path program 1 times [2020-12-03 12:37:01,076 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-03 12:37:01,076 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [726077043] [2020-12-03 12:37:01,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-03 12:37:01,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:37:01,115 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-03 12:37:01,116 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [726077043] [2020-12-03 12:37:01,116 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-03 12:37:01,116 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-12-03 12:37:01,117 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [62023340] [2020-12-03 12:37:01,117 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-03 12:37:01,117 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-03 12:37:01,118 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-03 12:37:01,119 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-03 12:37:01,119 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 3 states. [2020-12-03 12:37:01,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-03 12:37:01,142 INFO L93 Difference]: Finished difference Result 19 states and 21 transitions. [2020-12-03 12:37:01,142 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-03 12:37:01,143 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 4 [2020-12-03 12:37:01,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-03 12:37:01,143 INFO L225 Difference]: With dead ends: 19 [2020-12-03 12:37:01,144 INFO L226 Difference]: Without dead ends: 19 [2020-12-03 12:37:01,144 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-03 12:37:01,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-12-03 12:37:01,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-12-03 12:37:01,147 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-12-03 12:37:01,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2020-12-03 12:37:01,149 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 4 [2020-12-03 12:37:01,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-03 12:37:01,149 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2020-12-03 12:37:01,149 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-03 12:37:01,150 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2020-12-03 12:37:01,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2020-12-03 12:37:01,150 INFO L414 BasicCegarLoop]: Found error trace [2020-12-03 12:37:01,150 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2020-12-03 12:37:01,151 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-12-03 12:37:01,151 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr7ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr8ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr9ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-12-03 12:37:01,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-03 12:37:01,152 INFO L82 PathProgramCache]: Analyzing trace with hash 3079238, now seen corresponding path program 1 times [2020-12-03 12:37:01,153 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-03 12:37:01,153 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1565191891] [2020-12-03 12:37:01,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-03 12:37:01,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:37:01,240 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-03 12:37:01,241 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1565191891] [2020-12-03 12:37:01,241 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-03 12:37:01,241 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-03 12:37:01,241 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [813798062] [2020-12-03 12:37:01,242 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-03 12:37:01,242 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-03 12:37:01,243 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-03 12:37:01,243 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-12-03 12:37:01,243 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand 5 states. [2020-12-03 12:37:01,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-03 12:37:01,350 INFO L93 Difference]: Finished difference Result 33 states and 35 transitions. [2020-12-03 12:37:01,351 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-03 12:37:01,351 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 4 [2020-12-03 12:37:01,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-03 12:37:01,352 INFO L225 Difference]: With dead ends: 33 [2020-12-03 12:37:01,352 INFO L226 Difference]: Without dead ends: 33 [2020-12-03 12:37:01,352 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-12-03 12:37:01,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-12-03 12:37:01,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 21. [2020-12-03 12:37:01,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-12-03 12:37:01,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2020-12-03 12:37:01,357 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 4 [2020-12-03 12:37:01,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-03 12:37:01,358 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2020-12-03 12:37:01,358 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-03 12:37:01,358 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2020-12-03 12:37:01,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2020-12-03 12:37:01,358 INFO L414 BasicCegarLoop]: Found error trace [2020-12-03 12:37:01,358 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1] [2020-12-03 12:37:01,359 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-12-03 12:37:01,359 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr7ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr8ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr9ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-12-03 12:37:01,359 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-03 12:37:01,359 INFO L82 PathProgramCache]: Analyzing trace with hash 93846041, now seen corresponding path program 1 times [2020-12-03 12:37:01,360 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-03 12:37:01,360 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [474016895] [2020-12-03 12:37:01,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-03 12:37:01,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:37:01,446 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-03 12:37:01,446 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [474016895] [2020-12-03 12:37:01,446 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [391130348] [2020-12-03 12:37:01,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_ab4b390b-26a1-422a-adc8-8d829f99852c/bin/utaipan/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-03 12:37:01,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:37:01,518 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 11 conjunts are in the unsatisfiable core [2020-12-03 12:37:01,523 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-03 12:37:01,599 INFO L382 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 [2020-12-03 12:37:01,600 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-03 12:37:01,611 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-03 12:37:01,612 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2020-12-03 12:37:01,613 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:13, output treesize:12 [2020-12-03 12:37:01,683 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-03 12:37:01,683 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-03 12:37:01,757 INFO L639 QuantifierPusher]: Distributing 2 disjuncts over 3 conjuncts [2020-12-03 12:37:01,800 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-03 12:37:01,801 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2071330562] [2020-12-03 12:37:01,828 INFO L159 IcfgInterpreter]: Started Sifa with 4 locations of interest [2020-12-03 12:37:01,828 INFO L166 IcfgInterpreter]: Building call graph [2020-12-03 12:37:01,834 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-03 12:37:01,839 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-03 12:37:01,840 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-03 12:37:02,431 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-03 12:37:02,787 WARN L197 SmtUtils]: Spent 231.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 59 [2020-12-03 12:37:02,882 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-03 12:37:02,882 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-03 12:37:02,882 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 7 [2020-12-03 12:37:02,882 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [958668165] [2020-12-03 12:37:02,883 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-12-03 12:37:02,883 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-03 12:37:02,883 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-12-03 12:37:02,886 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2020-12-03 12:37:02,886 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 9 states. [2020-12-03 12:37:03,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-03 12:37:03,044 INFO L93 Difference]: Finished difference Result 46 states and 49 transitions. [2020-12-03 12:37:03,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-03 12:37:03,044 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 5 [2020-12-03 12:37:03,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-03 12:37:03,046 INFO L225 Difference]: With dead ends: 46 [2020-12-03 12:37:03,046 INFO L226 Difference]: Without dead ends: 46 [2020-12-03 12:37:03,047 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=56, Invalid=154, Unknown=0, NotChecked=0, Total=210 [2020-12-03 12:37:03,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-12-03 12:37:03,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 19. [2020-12-03 12:37:03,052 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-12-03 12:37:03,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2020-12-03 12:37:03,054 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 5 [2020-12-03 12:37:03,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-03 12:37:03,054 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2020-12-03 12:37:03,055 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-12-03 12:37:03,055 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2020-12-03 12:37:03,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2020-12-03 12:37:03,055 INFO L414 BasicCegarLoop]: Found error trace [2020-12-03 12:37:03,055 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2020-12-03 12:37:03,276 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2020-12-03 12:37:03,277 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr7ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr8ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr9ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-12-03 12:37:03,277 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-03 12:37:03,277 INFO L82 PathProgramCache]: Analyzing trace with hash -1385686635, now seen corresponding path program 1 times [2020-12-03 12:37:03,277 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-03 12:37:03,277 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1548085821] [2020-12-03 12:37:03,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-03 12:37:03,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:37:03,382 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-03 12:37:03,382 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1548085821] [2020-12-03 12:37:03,382 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [863150604] [2020-12-03 12:37:03,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_ab4b390b-26a1-422a-adc8-8d829f99852c/bin/utaipan/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-03 12:37:03,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:37:03,452 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 28 conjunts are in the unsatisfiable core [2020-12-03 12:37:03,454 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-03 12:37:03,516 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-03 12:37:03,517 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-03 12:37:03,603 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-03 12:37:03,603 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1232226451] [2020-12-03 12:37:03,607 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2020-12-03 12:37:03,607 INFO L166 IcfgInterpreter]: Building call graph [2020-12-03 12:37:03,607 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-03 12:37:03,608 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-03 12:37:03,610 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-03 12:37:04,058 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-03 12:37:04,073 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-12-03 12:37:04,123 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-03 12:37:04,380 WARN L197 SmtUtils]: Spent 227.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 59 [2020-12-03 12:37:04,723 WARN L197 SmtUtils]: Spent 221.00 ms on a formula simplification. DAG size of input: 72 DAG size of output: 61 [2020-12-03 12:37:05,279 WARN L197 SmtUtils]: Spent 496.00 ms on a formula simplification. DAG size of input: 92 DAG size of output: 85 [2020-12-03 12:37:05,281 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2020-12-03 12:37:05,281 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4, 3, 3] total 13 [2020-12-03 12:37:05,282 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1218405645] [2020-12-03 12:37:05,283 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-12-03 12:37:05,283 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-03 12:37:05,284 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-12-03 12:37:05,284 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=154, Unknown=0, NotChecked=0, Total=210 [2020-12-03 12:37:05,285 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand 6 states. [2020-12-03 12:37:05,508 WARN L197 SmtUtils]: Spent 192.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 62 [2020-12-03 12:37:05,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-03 12:37:05,614 INFO L93 Difference]: Finished difference Result 26 states and 29 transitions. [2020-12-03 12:37:05,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-03 12:37:05,615 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 6 [2020-12-03 12:37:05,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-03 12:37:05,615 INFO L225 Difference]: With dead ends: 26 [2020-12-03 12:37:05,615 INFO L226 Difference]: Without dead ends: 26 [2020-12-03 12:37:05,616 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 5 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=63, Invalid=177, Unknown=0, NotChecked=0, Total=240 [2020-12-03 12:37:05,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-12-03 12:37:05,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 22. [2020-12-03 12:37:05,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-12-03 12:37:05,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions. [2020-12-03 12:37:05,620 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 6 [2020-12-03 12:37:05,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-03 12:37:05,621 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 25 transitions. [2020-12-03 12:37:05,621 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-12-03 12:37:05,621 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions. [2020-12-03 12:37:05,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2020-12-03 12:37:05,621 INFO L414 BasicCegarLoop]: Found error trace [2020-12-03 12:37:05,621 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2020-12-03 12:37:05,824 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2020-12-03 12:37:05,825 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr7ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr8ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr9ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-12-03 12:37:05,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-03 12:37:05,826 INFO L82 PathProgramCache]: Analyzing trace with hash -1335820097, now seen corresponding path program 1 times [2020-12-03 12:37:05,826 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-03 12:37:05,826 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [207403491] [2020-12-03 12:37:05,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-03 12:37:05,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:37:05,921 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-03 12:37:05,921 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [207403491] [2020-12-03 12:37:05,923 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-03 12:37:05,923 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-12-03 12:37:05,923 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2122180610] [2020-12-03 12:37:05,923 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-12-03 12:37:05,923 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-03 12:37:05,924 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-12-03 12:37:05,924 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-12-03 12:37:05,924 INFO L87 Difference]: Start difference. First operand 22 states and 25 transitions. Second operand 6 states. [2020-12-03 12:37:06,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-03 12:37:06,068 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2020-12-03 12:37:06,070 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-03 12:37:06,072 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 6 [2020-12-03 12:37:06,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-03 12:37:06,074 INFO L225 Difference]: With dead ends: 34 [2020-12-03 12:37:06,074 INFO L226 Difference]: Without dead ends: 34 [2020-12-03 12:37:06,075 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2020-12-03 12:37:06,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-12-03 12:37:06,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 26. [2020-12-03 12:37:06,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-12-03 12:37:06,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2020-12-03 12:37:06,083 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 6 [2020-12-03 12:37:06,083 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-03 12:37:06,083 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2020-12-03 12:37:06,083 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-12-03 12:37:06,083 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2020-12-03 12:37:06,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2020-12-03 12:37:06,083 INFO L414 BasicCegarLoop]: Found error trace [2020-12-03 12:37:06,084 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2020-12-03 12:37:06,084 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51 [2020-12-03 12:37:06,085 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr7ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr8ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr9ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr6ASSERT_VIOLATIONMEMORY_FREE, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-12-03 12:37:06,086 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-03 12:37:06,086 INFO L82 PathProgramCache]: Analyzing trace with hash -204994994, now seen corresponding path program 1 times [2020-12-03 12:37:06,086 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-03 12:37:06,086 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2134344139] [2020-12-03 12:37:06,087 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-03 12:37:06,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-03 12:37:06,126 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-03 12:37:06,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-03 12:37:06,152 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-03 12:37:06,182 INFO L173 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2020-12-03 12:37:06,182 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-12-03 12:37:06,183 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52 [2020-12-03 12:37:06,217 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 03.12 12:37:06 BoogieIcfgContainer [2020-12-03 12:37:06,217 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-12-03 12:37:06,218 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-12-03 12:37:06,218 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-12-03 12:37:06,218 INFO L275 PluginConnector]: Witness Printer initialized [2020-12-03 12:37:06,218 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 12:37:00" (3/4) ... [2020-12-03 12:37:06,220 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-12-03 12:37:06,256 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_ab4b390b-26a1-422a-adc8-8d829f99852c/bin/utaipan/witness.graphml [2020-12-03 12:37:06,256 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-12-03 12:37:06,262 INFO L168 Benchmark]: Toolchain (without parser) took 6968.12 ms. Allocated memory was 94.4 MB in the beginning and 136.3 MB in the end (delta: 41.9 MB). Free memory was 63.9 MB in the beginning and 47.3 MB in the end (delta: 16.6 MB). Peak memory consumption was 57.7 MB. Max. memory is 16.1 GB. [2020-12-03 12:37:06,263 INFO L168 Benchmark]: CDTParser took 0.28 ms. Allocated memory is still 94.4 MB. Free memory was 50.7 MB in the beginning and 50.7 MB in the end (delta: 44.2 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-12-03 12:37:06,263 INFO L168 Benchmark]: CACSL2BoogieTranslator took 449.45 ms. Allocated memory is still 94.4 MB. Free memory was 63.9 MB in the beginning and 60.8 MB in the end (delta: 3.0 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2020-12-03 12:37:06,263 INFO L168 Benchmark]: Boogie Procedure Inliner took 40.72 ms. Allocated memory is still 94.4 MB. Free memory was 60.8 MB in the beginning and 59.1 MB in the end (delta: 1.7 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-12-03 12:37:06,264 INFO L168 Benchmark]: Boogie Preprocessor took 25.94 ms. Allocated memory is still 94.4 MB. Free memory was 59.1 MB in the beginning and 57.8 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-12-03 12:37:06,264 INFO L168 Benchmark]: RCFGBuilder took 646.50 ms. Allocated memory was 94.4 MB in the beginning and 113.2 MB in the end (delta: 18.9 MB). Free memory was 57.8 MB in the beginning and 84.3 MB in the end (delta: -26.5 MB). Peak memory consumption was 20.9 MB. Max. memory is 16.1 GB. [2020-12-03 12:37:06,264 INFO L168 Benchmark]: TraceAbstraction took 5756.73 ms. Allocated memory was 113.2 MB in the beginning and 136.3 MB in the end (delta: 23.1 MB). Free memory was 84.3 MB in the beginning and 49.1 MB in the end (delta: 35.2 MB). Peak memory consumption was 58.1 MB. Max. memory is 16.1 GB. [2020-12-03 12:37:06,265 INFO L168 Benchmark]: Witness Printer took 38.90 ms. Allocated memory is still 136.3 MB. Free memory was 49.1 MB in the beginning and 47.3 MB in the end (delta: 1.8 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-12-03 12:37:06,267 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.28 ms. Allocated memory is still 94.4 MB. Free memory was 50.7 MB in the beginning and 50.7 MB in the end (delta: 44.2 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 449.45 ms. Allocated memory is still 94.4 MB. Free memory was 63.9 MB in the beginning and 60.8 MB in the end (delta: 3.0 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 40.72 ms. Allocated memory is still 94.4 MB. Free memory was 60.8 MB in the beginning and 59.1 MB in the end (delta: 1.7 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 25.94 ms. Allocated memory is still 94.4 MB. Free memory was 59.1 MB in the beginning and 57.8 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 646.50 ms. Allocated memory was 94.4 MB in the beginning and 113.2 MB in the end (delta: 18.9 MB). Free memory was 57.8 MB in the beginning and 84.3 MB in the end (delta: -26.5 MB). Peak memory consumption was 20.9 MB. Max. memory is 16.1 GB. * TraceAbstraction took 5756.73 ms. Allocated memory was 113.2 MB in the beginning and 136.3 MB in the end (delta: 23.1 MB). Free memory was 84.3 MB in the beginning and 49.1 MB in the end (delta: 35.2 MB). Peak memory consumption was 58.1 MB. Max. memory is 16.1 GB. * Witness Printer took 38.90 ms. Allocated memory is still 136.3 MB. Free memory was 49.1 MB in the beginning and 47.3 MB in the end (delta: 1.8 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 532]: pointer dereference may fail pointer dereference may fail We found a FailurePath: [L515] int length = __VERIFIER_nondet_int(); [L516] COND FALSE !(length < 1) [L519] char* nondetString = (char*) malloc(length * sizeof(char)); [L521] int i = 0; [L521] COND TRUE i < length - 1 [L523] nondetString[i] = __VERIFIER_nondet_char() [L521] i++ [L521] COND FALSE !(i < length - 1) [L526] nondetString[length-1] = '\0' [L527] return nondetString; [L537] char* p = build_nondet_String(); [L531] const char *p = s; [L532] EXPR \read(*p) [L532] COND TRUE *p != '\0' [L533] p = p+2 [L532] \read(*p) - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 22 locations, 10 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 5.6s, OverallIterations: 9, TraceHistogramMax: 2, AutomataDifference: 0.9s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 108 SDtfs, 257 SDslu, 161 SDs, 0 SdLazy, 211 SolverSat, 20 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 60 GetRequests, 12 SyntacticMatches, 3 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 2.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=26occurred in iteration=8, 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, 8 MinimizatonAttempts, 66 StatesRemovedByMinimization, 5 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.9s InterpolantComputationTime, 53 NumberOfCodeBlocks, 53 NumberOfCodeBlocksAsserted, 11 NumberOfCheckSat, 44 ConstructedInterpolants, 0 QuantifiedInterpolants, 1828 SizeOfPredicates, 19 NumberOfNonLiveVariables, 101 ConjunctsInSsa, 39 ConjunctsInUnsatCore, 12 InterpolantComputations, 6 PerfectInterpolantSequences, 2/10 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: OVERALL_TIME[ms]: 517, ICFG_INTERPRETER_ENTERED_PROCEDURES: 1, DAG_INTERPRETER_EARLY_EXIT_QUERIES_NONTRIVIAL: 6, DAG_INTERPRETER_EARLY_EXITS: 0, TOOLS_POST_APPLICATIONS: 12, TOOLS_POST_TIME[ms]: 360, TOOLS_POST_CALL_APPLICATIONS: 0, TOOLS_POST_CALL_TIME[ms]: 0, TOOLS_POST_RETURN_APPLICATIONS: 0, TOOLS_POST_RETURN_TIME[ms]: 0, TOOLS_QUANTIFIERELIM_APPLICATIONS: 12, TOOLS_QUANTIFIERELIM_TIME[ms]: 352, TOOLS_QUANTIFIERELIM_MAX_TIME[ms]: 129, FLUID_QUERY_TIME[ms]: 1, FLUID_QUERIES: 26, FLUID_YES_ANSWERS: 0, DOMAIN_JOIN_APPLICATIONS: 2, DOMAIN_JOIN_TIME[ms]: 46, DOMAIN_ALPHA_APPLICATIONS: 0, DOMAIN_ALPHA_TIME[ms]: 0, DOMAIN_WIDEN_APPLICATIONS: 2, DOMAIN_WIDEN_TIME[ms]: 80, DOMAIN_ISSUBSETEQ_APPLICATIONS: 3, DOMAIN_ISSUBSETEQ_TIME[ms]: 7, DOMAIN_ISBOTTOM_APPLICATIONS: 6, DOMAIN_ISBOTTOM_TIME[ms]: 9, LOOP_SUMMARIZER_APPLICATIONS: 1, LOOP_SUMMARIZER_CACHE_MISSES: 1, LOOP_SUMMARIZER_OVERALL_TIME[ms]: 246, LOOP_SUMMARIZER_NEW_COMPUTATION_TIME[ms]: 246, LOOP_SUMMARIZER_FIXPOINT_ITERATIONS: 3, CALL_SUMMARIZER_APPLICATIONS: 0, CALL_SUMMARIZER_CACHE_MISSES: 0, CALL_SUMMARIZER_OVERALL_TIME[ms]: 0, CALL_SUMMARIZER_NEW_COMPUTATION_TIME[ms]: 0, PROCEDURE_GRAPH_BUILDER_TIME[ms]: 0, PATH_EXPR_TIME[ms]: 0, REGEX_TO_DAG_TIME[ms]: 0, DAG_COMPRESSION_TIME[ms]: 5, DAG_COMPRESSION_PROCESSED_NODES: 51, DAG_COMPRESSION_RETAINED_NODES: 20, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...