./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/dijkstra-u_unwindbound1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version e943c265 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca7f33ff-dfb5-4b42-850e-522ff3ed7adb/bin/utaipan-tZwUujhuQw/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca7f33ff-dfb5-4b42-850e-522ff3ed7adb/bin/utaipan-tZwUujhuQw/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca7f33ff-dfb5-4b42-850e-522ff3ed7adb/bin/utaipan-tZwUujhuQw/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca7f33ff-dfb5-4b42-850e-522ff3ed7adb/bin/utaipan-tZwUujhuQw/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/dijkstra-u_unwindbound1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca7f33ff-dfb5-4b42-850e-522ff3ed7adb/bin/utaipan-tZwUujhuQw/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca7f33ff-dfb5-4b42-850e-522ff3ed7adb/bin/utaipan-tZwUujhuQw --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash d205b4d392fcf6603d2c7a58c20f30b20ad63dac227f46def37edd46d8cc7990 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.2.1-dev-e943c26 [2021-10-20 05:26:05,883 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-10-20 05:26:05,885 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-10-20 05:26:05,926 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-10-20 05:26:05,927 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-10-20 05:26:05,928 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-10-20 05:26:05,930 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-10-20 05:26:05,932 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-10-20 05:26:05,934 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-10-20 05:26:05,935 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-10-20 05:26:05,937 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-10-20 05:26:05,938 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-10-20 05:26:05,939 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-10-20 05:26:05,940 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-10-20 05:26:05,942 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-10-20 05:26:05,943 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-10-20 05:26:05,945 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-10-20 05:26:05,946 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-10-20 05:26:05,949 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-10-20 05:26:05,951 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-10-20 05:26:05,954 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-10-20 05:26:05,955 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-10-20 05:26:05,957 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-10-20 05:26:05,958 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-10-20 05:26:05,962 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-10-20 05:26:05,963 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-10-20 05:26:05,963 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-10-20 05:26:05,964 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-10-20 05:26:05,965 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-10-20 05:26:05,966 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-10-20 05:26:05,966 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-10-20 05:26:05,967 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-10-20 05:26:05,968 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-10-20 05:26:05,969 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-10-20 05:26:05,970 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-10-20 05:26:05,971 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-10-20 05:26:05,972 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-10-20 05:26:05,972 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-10-20 05:26:05,973 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-10-20 05:26:05,974 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-10-20 05:26:05,975 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-10-20 05:26:05,976 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca7f33ff-dfb5-4b42-850e-522ff3ed7adb/bin/utaipan-tZwUujhuQw/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-10-20 05:26:06,003 INFO L113 SettingsManager]: Loading preferences was successful [2021-10-20 05:26:06,003 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-10-20 05:26:06,004 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-10-20 05:26:06,005 INFO L138 SettingsManager]: * User list type=DISABLED [2021-10-20 05:26:06,005 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-10-20 05:26:06,006 INFO L138 SettingsManager]: * Explicit value domain=true [2021-10-20 05:26:06,006 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-10-20 05:26:06,007 INFO L138 SettingsManager]: * Octagon Domain=false [2021-10-20 05:26:06,007 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-10-20 05:26:06,007 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-10-20 05:26:06,008 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-10-20 05:26:06,008 INFO L138 SettingsManager]: * Interval Domain=false [2021-10-20 05:26:06,009 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-10-20 05:26:06,009 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-10-20 05:26:06,009 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-10-20 05:26:06,010 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-10-20 05:26:06,011 INFO L138 SettingsManager]: * sizeof long=4 [2021-10-20 05:26:06,011 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-10-20 05:26:06,011 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-10-20 05:26:06,012 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-10-20 05:26:06,012 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-10-20 05:26:06,013 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-10-20 05:26:06,013 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-10-20 05:26:06,013 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-10-20 05:26:06,014 INFO L138 SettingsManager]: * sizeof long double=12 [2021-10-20 05:26:06,014 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-10-20 05:26:06,014 INFO L138 SettingsManager]: * Use constant arrays=true [2021-10-20 05:26:06,014 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-10-20 05:26:06,015 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-10-20 05:26:06,015 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-10-20 05:26:06,015 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-20 05:26:06,015 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-10-20 05:26:06,016 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-10-20 05:26:06,016 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-10-20 05:26:06,016 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-10-20 05:26:06,016 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-10-20 05:26:06,017 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-10-20 05:26:06,017 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-10-20 05:26:06,017 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-10-20 05:26:06,017 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_worker_vcloud-master_on_vcloud-master/run_dir_ca7f33ff-dfb5-4b42-850e-522ff3ed7adb/bin/utaipan-tZwUujhuQw/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca7f33ff-dfb5-4b42-850e-522ff3ed7adb/bin/utaipan-tZwUujhuQw Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> d205b4d392fcf6603d2c7a58c20f30b20ad63dac227f46def37edd46d8cc7990 [2021-10-20 05:26:06,263 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-10-20 05:26:06,290 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-10-20 05:26:06,293 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-10-20 05:26:06,294 INFO L271 PluginConnector]: Initializing CDTParser... [2021-10-20 05:26:06,295 INFO L275 PluginConnector]: CDTParser initialized [2021-10-20 05:26:06,296 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca7f33ff-dfb5-4b42-850e-522ff3ed7adb/bin/utaipan-tZwUujhuQw/../../sv-benchmarks/c/nla-digbench-scaling/dijkstra-u_unwindbound1.c [2021-10-20 05:26:06,367 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca7f33ff-dfb5-4b42-850e-522ff3ed7adb/bin/utaipan-tZwUujhuQw/data/ff76b4357/6870b0c544634c23b901fa4de2188da5/FLAG43a8dac0c [2021-10-20 05:26:06,777 INFO L306 CDTParser]: Found 1 translation units. [2021-10-20 05:26:06,778 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca7f33ff-dfb5-4b42-850e-522ff3ed7adb/sv-benchmarks/c/nla-digbench-scaling/dijkstra-u_unwindbound1.c [2021-10-20 05:26:06,791 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca7f33ff-dfb5-4b42-850e-522ff3ed7adb/bin/utaipan-tZwUujhuQw/data/ff76b4357/6870b0c544634c23b901fa4de2188da5/FLAG43a8dac0c [2021-10-20 05:26:07,195 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca7f33ff-dfb5-4b42-850e-522ff3ed7adb/bin/utaipan-tZwUujhuQw/data/ff76b4357/6870b0c544634c23b901fa4de2188da5 [2021-10-20 05:26:07,197 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-10-20 05:26:07,199 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-10-20 05:26:07,200 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-10-20 05:26:07,201 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-10-20 05:26:07,203 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-10-20 05:26:07,204 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.10 05:26:07" (1/1) ... [2021-10-20 05:26:07,205 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@12b1b74c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 05:26:07, skipping insertion in model container [2021-10-20 05:26:07,206 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.10 05:26:07" (1/1) ... [2021-10-20 05:26:07,218 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-10-20 05:26:07,239 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-10-20 05:26:07,405 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca7f33ff-dfb5-4b42-850e-522ff3ed7adb/sv-benchmarks/c/nla-digbench-scaling/dijkstra-u_unwindbound1.c[525,538] [2021-10-20 05:26:07,439 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-20 05:26:07,448 INFO L203 MainTranslator]: Completed pre-run [2021-10-20 05:26:07,460 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca7f33ff-dfb5-4b42-850e-522ff3ed7adb/sv-benchmarks/c/nla-digbench-scaling/dijkstra-u_unwindbound1.c[525,538] [2021-10-20 05:26:07,485 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-20 05:26:07,504 INFO L208 MainTranslator]: Completed translation [2021-10-20 05:26:07,506 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 05:26:07 WrapperNode [2021-10-20 05:26:07,506 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-10-20 05:26:07,508 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-10-20 05:26:07,508 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-10-20 05:26:07,508 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-10-20 05:26:07,516 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 05:26:07" (1/1) ... [2021-10-20 05:26:07,542 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 05:26:07" (1/1) ... [2021-10-20 05:26:07,582 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-10-20 05:26:07,585 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-10-20 05:26:07,585 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-10-20 05:26:07,586 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-10-20 05:26:07,594 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 05:26:07" (1/1) ... [2021-10-20 05:26:07,595 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 05:26:07" (1/1) ... [2021-10-20 05:26:07,598 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 05:26:07" (1/1) ... [2021-10-20 05:26:07,598 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 05:26:07" (1/1) ... [2021-10-20 05:26:07,614 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 05:26:07" (1/1) ... [2021-10-20 05:26:07,622 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 05:26:07" (1/1) ... [2021-10-20 05:26:07,625 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 05:26:07" (1/1) ... [2021-10-20 05:26:07,632 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-10-20 05:26:07,635 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-10-20 05:26:07,636 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-10-20 05:26:07,636 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-10-20 05:26:07,637 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 05:26:07" (1/1) ... [2021-10-20 05:26:07,645 INFO L170 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-20 05:26:07,660 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca7f33ff-dfb5-4b42-850e-522ff3ed7adb/bin/utaipan-tZwUujhuQw/z3 [2021-10-20 05:26:07,675 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca7f33ff-dfb5-4b42-850e-522ff3ed7adb/bin/utaipan-tZwUujhuQw/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-10-20 05:26:07,704 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca7f33ff-dfb5-4b42-850e-522ff3ed7adb/bin/utaipan-tZwUujhuQw/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-10-20 05:26:07,723 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-10-20 05:26:07,723 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-10-20 05:26:07,725 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-10-20 05:26:07,725 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-10-20 05:26:10,315 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-10-20 05:26:10,316 INFO L299 CfgBuilder]: Removed 26 assume(true) statements. [2021-10-20 05:26:10,318 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.10 05:26:10 BoogieIcfgContainer [2021-10-20 05:26:10,318 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-10-20 05:26:10,320 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-10-20 05:26:10,321 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-10-20 05:26:10,324 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-10-20 05:26:10,324 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.10 05:26:07" (1/3) ... [2021-10-20 05:26:10,325 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@194386c1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.10 05:26:10, skipping insertion in model container [2021-10-20 05:26:10,325 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 05:26:07" (2/3) ... [2021-10-20 05:26:10,326 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@194386c1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.10 05:26:10, skipping insertion in model container [2021-10-20 05:26:10,326 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.10 05:26:10" (3/3) ... [2021-10-20 05:26:10,328 INFO L111 eAbstractionObserver]: Analyzing ICFG dijkstra-u_unwindbound1.c [2021-10-20 05:26:10,333 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-10-20 05:26:10,333 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 9 error locations. [2021-10-20 05:26:10,379 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-10-20 05:26:10,386 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-10-20 05:26:10,386 INFO L340 AbstractCegarLoop]: Starting to check reachability of 9 error locations. [2021-10-20 05:26:10,400 INFO L276 IsEmpty]: Start isEmpty. Operand has 44 states, 34 states have (on average 1.7058823529411764) internal successors, (58), 43 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-20 05:26:10,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-10-20 05:26:10,405 INFO L504 BasicCegarLoop]: Found error trace [2021-10-20 05:26:10,405 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-10-20 05:26:10,406 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr6ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 6 more)] === [2021-10-20 05:26:10,411 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-20 05:26:10,411 INFO L82 PathProgramCache]: Analyzing trace with hash 1143465249, now seen corresponding path program 1 times [2021-10-20 05:26:10,421 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-20 05:26:10,421 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [481442317] [2021-10-20 05:26:10,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-20 05:26:10,422 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-20 05:26:10,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-20 05:26:10,566 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-20 05:26:10,566 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-20 05:26:10,567 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [481442317] [2021-10-20 05:26:10,567 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [481442317] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-20 05:26:10,568 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-20 05:26:10,568 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-10-20 05:26:10,570 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [303278506] [2021-10-20 05:26:10,574 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-10-20 05:26:10,574 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-20 05:26:10,586 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-10-20 05:26:10,587 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-10-20 05:26:10,589 INFO L87 Difference]: Start difference. First operand has 44 states, 34 states have (on average 1.7058823529411764) internal successors, (58), 43 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-20 05:26:10,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-20 05:26:10,607 INFO L93 Difference]: Finished difference Result 84 states and 109 transitions. [2021-10-20 05:26:10,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-10-20 05:26:10,608 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-10-20 05:26:10,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-20 05:26:10,616 INFO L225 Difference]: With dead ends: 84 [2021-10-20 05:26:10,616 INFO L226 Difference]: Without dead ends: 42 [2021-10-20 05:26:10,619 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0ms TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-10-20 05:26:10,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-10-20 05:26:10,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2021-10-20 05:26:10,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 33 states have (on average 1.3636363636363635) internal successors, (45), 41 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-20 05:26:10,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 45 transitions. [2021-10-20 05:26:10,650 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 45 transitions. Word has length 6 [2021-10-20 05:26:10,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-20 05:26:10,651 INFO L470 AbstractCegarLoop]: Abstraction has 42 states and 45 transitions. [2021-10-20 05:26:10,651 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-20 05:26:10,651 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 45 transitions. [2021-10-20 05:26:10,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-10-20 05:26:10,652 INFO L504 BasicCegarLoop]: Found error trace [2021-10-20 05:26:10,652 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-10-20 05:26:10,653 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-10-20 05:26:10,653 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 6 more)] === [2021-10-20 05:26:10,654 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-20 05:26:10,654 INFO L82 PathProgramCache]: Analyzing trace with hash 651938503, now seen corresponding path program 1 times [2021-10-20 05:26:10,654 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-20 05:26:10,655 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1891411837] [2021-10-20 05:26:10,655 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-20 05:26:10,655 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-20 05:26:10,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-20 05:26:10,713 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-20 05:26:10,713 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-20 05:26:10,714 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1891411837] [2021-10-20 05:26:10,714 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1891411837] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-20 05:26:10,714 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-20 05:26:10,714 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-10-20 05:26:10,715 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1230366538] [2021-10-20 05:26:10,716 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-10-20 05:26:10,716 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-20 05:26:10,717 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-10-20 05:26:10,717 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-10-20 05:26:10,718 INFO L87 Difference]: Start difference. First operand 42 states and 45 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-20 05:26:10,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-20 05:26:10,740 INFO L93 Difference]: Finished difference Result 82 states and 87 transitions. [2021-10-20 05:26:10,741 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-10-20 05:26:10,741 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-10-20 05:26:10,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-20 05:26:10,742 INFO L225 Difference]: With dead ends: 82 [2021-10-20 05:26:10,742 INFO L226 Difference]: Without dead ends: 44 [2021-10-20 05:26:10,743 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 7.8ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-10-20 05:26:10,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-10-20 05:26:10,748 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2021-10-20 05:26:10,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 35 states have (on average 1.3428571428571427) internal successors, (47), 43 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-20 05:26:10,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 47 transitions. [2021-10-20 05:26:10,770 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 47 transitions. Word has length 7 [2021-10-20 05:26:10,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-20 05:26:10,771 INFO L470 AbstractCegarLoop]: Abstraction has 44 states and 47 transitions. [2021-10-20 05:26:10,771 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-20 05:26:10,771 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 47 transitions. [2021-10-20 05:26:10,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-10-20 05:26:10,772 INFO L504 BasicCegarLoop]: Found error trace [2021-10-20 05:26:10,772 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-10-20 05:26:10,772 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-10-20 05:26:10,773 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 6 more)] === [2021-10-20 05:26:10,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-20 05:26:10,774 INFO L82 PathProgramCache]: Analyzing trace with hash -1215948133, now seen corresponding path program 1 times [2021-10-20 05:26:10,774 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-20 05:26:10,774 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [583287192] [2021-10-20 05:26:10,775 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-20 05:26:10,775 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-20 05:26:10,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-20 05:26:10,877 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-20 05:26:10,878 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-20 05:26:10,880 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [583287192] [2021-10-20 05:26:10,880 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [583287192] provided 1 perfect and 0 imperfect interpolant sequences [2021-10-20 05:26:10,881 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-20 05:26:10,881 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-10-20 05:26:10,882 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [250928545] [2021-10-20 05:26:10,882 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-10-20 05:26:10,884 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-20 05:26:10,885 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-10-20 05:26:10,886 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-10-20 05:26:10,886 INFO L87 Difference]: Start difference. First operand 44 states and 47 transitions. Second operand has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 5 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-20 05:26:10,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-20 05:26:10,941 INFO L93 Difference]: Finished difference Result 58 states and 61 transitions. [2021-10-20 05:26:10,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-10-20 05:26:10,943 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 5 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-10-20 05:26:10,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-20 05:26:10,943 INFO L225 Difference]: With dead ends: 58 [2021-10-20 05:26:10,944 INFO L226 Difference]: Without dead ends: 20 [2021-10-20 05:26:10,944 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 31.1ms TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-10-20 05:26:10,945 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-10-20 05:26:10,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2021-10-20 05:26:10,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 19 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-20 05:26:10,951 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2021-10-20 05:26:10,951 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 8 [2021-10-20 05:26:10,951 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-20 05:26:10,951 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2021-10-20 05:26:10,952 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 5 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-20 05:26:10,952 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2021-10-20 05:26:10,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-10-20 05:26:10,953 INFO L504 BasicCegarLoop]: Found error trace [2021-10-20 05:26:10,953 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-20 05:26:10,954 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-10-20 05:26:10,954 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr6ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 6 more)] === [2021-10-20 05:26:10,955 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-20 05:26:10,955 INFO L82 PathProgramCache]: Analyzing trace with hash 960330495, now seen corresponding path program 1 times [2021-10-20 05:26:10,956 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-20 05:26:10,956 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1269005881] [2021-10-20 05:26:10,956 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-20 05:26:10,956 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-20 05:26:10,984 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-10-20 05:26:10,985 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [279946412] [2021-10-20 05:26:10,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-20 05:26:10,986 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-20 05:26:10,986 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca7f33ff-dfb5-4b42-850e-522ff3ed7adb/bin/utaipan-tZwUujhuQw/z3 [2021-10-20 05:26:10,996 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca7f33ff-dfb5-4b42-850e-522ff3ed7adb/bin/utaipan-tZwUujhuQw/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-20 05:26:10,999 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca7f33ff-dfb5-4b42-850e-522ff3ed7adb/bin/utaipan-tZwUujhuQw/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-10-20 05:26:11,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-20 05:26:11,100 INFO L263 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 7 conjunts are in the unsatisfiable core [2021-10-20 05:26:11,105 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-20 05:26:11,287 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-20 05:26:11,287 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-20 05:26:12,967 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-20 05:26:12,968 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-20 05:26:12,968 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1269005881] [2021-10-20 05:26:12,968 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-10-20 05:26:12,968 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [279946412] [2021-10-20 05:26:12,969 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [279946412] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-20 05:26:12,969 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-20 05:26:12,969 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-10-20 05:26:12,969 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1094011508] [2021-10-20 05:26:12,970 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-10-20 05:26:12,970 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-20 05:26:12,971 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-10-20 05:26:12,971 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-10-20 05:26:12,971 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-20 05:26:13,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-20 05:26:13,038 INFO L93 Difference]: Finished difference Result 20 states and 21 transitions. [2021-10-20 05:26:13,038 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-10-20 05:26:13,038 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-10-20 05:26:13,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-20 05:26:13,039 INFO L225 Difference]: With dead ends: 20 [2021-10-20 05:26:13,039 INFO L226 Difference]: Without dead ends: 14 [2021-10-20 05:26:13,039 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 12 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 571.7ms TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-10-20 05:26:13,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2021-10-20 05:26:13,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2021-10-20 05:26:13,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 13 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-20 05:26:13,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2021-10-20 05:26:13,042 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 9 [2021-10-20 05:26:13,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-20 05:26:13,043 INFO L470 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2021-10-20 05:26:13,043 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-20 05:26:13,043 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2021-10-20 05:26:13,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-10-20 05:26:13,043 INFO L504 BasicCegarLoop]: Found error trace [2021-10-20 05:26:13,044 INFO L512 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-20 05:26:13,051 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca7f33ff-dfb5-4b42-850e-522ff3ed7adb/bin/utaipan-tZwUujhuQw/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-10-20 05:26:13,247 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca7f33ff-dfb5-4b42-850e-522ff3ed7adb/bin/utaipan-tZwUujhuQw/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-20 05:26:13,248 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr7ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION (and 6 more)] === [2021-10-20 05:26:13,248 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-20 05:26:13,249 INFO L82 PathProgramCache]: Analyzing trace with hash -540204062, now seen corresponding path program 1 times [2021-10-20 05:26:13,249 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-10-20 05:26:13,249 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [401251821] [2021-10-20 05:26:13,249 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-20 05:26:13,249 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-10-20 05:26:13,261 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-10-20 05:26:13,262 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1650931043] [2021-10-20 05:26:13,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-20 05:26:13,262 INFO L170 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-20 05:26:13,262 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca7f33ff-dfb5-4b42-850e-522ff3ed7adb/bin/utaipan-tZwUujhuQw/z3 [2021-10-20 05:26:13,263 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca7f33ff-dfb5-4b42-850e-522ff3ed7adb/bin/utaipan-tZwUujhuQw/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-10-20 05:26:13,286 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca7f33ff-dfb5-4b42-850e-522ff3ed7adb/bin/utaipan-tZwUujhuQw/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-10-20 05:26:13,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-20 05:26:13,339 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 7 conjunts are in the unsatisfiable core [2021-10-20 05:26:13,340 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-10-20 05:26:13,459 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-20 05:26:13,460 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-10-20 05:26:13,527 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-20 05:26:13,528 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-10-20 05:26:13,528 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [401251821] [2021-10-20 05:26:13,528 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-10-20 05:26:13,528 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1650931043] [2021-10-20 05:26:13,529 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1650931043] provided 2 perfect and 0 imperfect interpolant sequences [2021-10-20 05:26:13,529 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-10-20 05:26:13,529 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-10-20 05:26:13,529 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2111458013] [2021-10-20 05:26:13,530 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-10-20 05:26:13,530 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-10-20 05:26:13,531 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-10-20 05:26:13,531 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-10-20 05:26:13,532 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand has 5 states, 5 states have (on average 4.0) internal successors, (20), 4 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-20 05:26:13,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-20 05:26:13,563 INFO L93 Difference]: Finished difference Result 14 states and 15 transitions. [2021-10-20 05:26:13,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-10-20 05:26:13,567 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.0) internal successors, (20), 4 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-10-20 05:26:13,568 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-20 05:26:13,568 INFO L225 Difference]: With dead ends: 14 [2021-10-20 05:26:13,568 INFO L226 Difference]: Without dead ends: 0 [2021-10-20 05:26:13,569 INFO L781 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 24.9ms TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-10-20 05:26:13,570 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-10-20 05:26:13,570 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-10-20 05:26:13,570 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-20 05:26:13,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-10-20 05:26:13,578 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 11 [2021-10-20 05:26:13,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-20 05:26:13,579 INFO L470 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-10-20 05:26:13,579 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.0) internal successors, (20), 4 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-10-20 05:26:13,579 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-10-20 05:26:13,579 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-10-20 05:26:13,582 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION [2021-10-20 05:26:13,582 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION [2021-10-20 05:26:13,583 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION [2021-10-20 05:26:13,583 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr3ASSERT_VIOLATIONERROR_FUNCTION [2021-10-20 05:26:13,584 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr4ASSERT_VIOLATIONERROR_FUNCTION [2021-10-20 05:26:13,586 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr5ASSERT_VIOLATIONERROR_FUNCTION [2021-10-20 05:26:13,590 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr6ASSERT_VIOLATIONERROR_FUNCTION [2021-10-20 05:26:13,590 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr7ASSERT_VIOLATIONERROR_FUNCTION [2021-10-20 05:26:13,590 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr8ASSERT_VIOLATIONERROR_FUNCTION [2021-10-20 05:26:13,628 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca7f33ff-dfb5-4b42-850e-522ff3ed7adb/bin/utaipan-tZwUujhuQw/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-10-20 05:26:13,806 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca7f33ff-dfb5-4b42-850e-522ff3ed7adb/bin/utaipan-tZwUujhuQw/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-10-20 05:26:13,807 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2021-10-20 05:26:13,811 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-20 05:26:13,813 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-20 05:26:13,815 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-20 05:26:13,816 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-20 05:26:13,817 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-20 05:26:13,819 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-20 05:26:13,831 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-20 05:26:13,832 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-20 05:26:13,833 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-20 05:26:13,838 INFO L128 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-10-20 05:26:13,875 INFO L857 garLoopResultBuilder]: For program point ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION(line 14) no Hoare annotation was computed. [2021-10-20 05:26:13,875 INFO L857 garLoopResultBuilder]: For program point L52-2(lines 20 61) no Hoare annotation was computed. [2021-10-20 05:26:13,876 INFO L857 garLoopResultBuilder]: For program point ULTIMATE.startErr4ASSERT_VIOLATIONERROR_FUNCTION(line 14) no Hoare annotation was computed. [2021-10-20 05:26:13,876 INFO L857 garLoopResultBuilder]: For program point ULTIMATE.startENTRY(line -1) no Hoare annotation was computed. [2021-10-20 05:26:13,876 INFO L857 garLoopResultBuilder]: For program point L12(lines 12 15) no Hoare annotation was computed. [2021-10-20 05:26:13,876 INFO L853 garLoopResultBuilder]: At program point L12-2(lines 11 17) the Hoare annotation is: false [2021-10-20 05:26:13,877 INFO L857 garLoopResultBuilder]: For program point L12-3(lines 12 15) no Hoare annotation was computed. [2021-10-20 05:26:13,877 INFO L853 garLoopResultBuilder]: At program point L12-5(lines 11 17) the Hoare annotation is: false [2021-10-20 05:26:13,877 INFO L857 garLoopResultBuilder]: For program point L12-6(lines 12 15) no Hoare annotation was computed. [2021-10-20 05:26:13,877 INFO L853 garLoopResultBuilder]: At program point L12-8(lines 11 17) the Hoare annotation is: false [2021-10-20 05:26:13,877 INFO L857 garLoopResultBuilder]: For program point L12-9(lines 12 15) no Hoare annotation was computed. [2021-10-20 05:26:13,878 INFO L853 garLoopResultBuilder]: At program point L12-11(lines 11 17) the Hoare annotation is: false [2021-10-20 05:26:13,878 INFO L857 garLoopResultBuilder]: For program point L12-12(lines 12 15) no Hoare annotation was computed. [2021-10-20 05:26:13,878 INFO L853 garLoopResultBuilder]: At program point L12-14(lines 11 17) the Hoare annotation is: false [2021-10-20 05:26:13,878 INFO L857 garLoopResultBuilder]: For program point L12-15(lines 12 15) no Hoare annotation was computed. [2021-10-20 05:26:13,878 INFO L853 garLoopResultBuilder]: At program point L12-17(lines 46 47) the Hoare annotation is: false [2021-10-20 05:26:13,878 INFO L857 garLoopResultBuilder]: For program point L12-18(lines 12 15) no Hoare annotation was computed. [2021-10-20 05:26:13,879 INFO L853 garLoopResultBuilder]: At program point L12-20(lines 11 17) the Hoare annotation is: (and (<= 1 ULTIMATE.start___VERIFIER_assert_~cond) (= ULTIMATE.start_main_~p~0 0) (<= 1 ~counter~0) (= ULTIMATE.start_main_~h~0 0) (= ULTIMATE.start_main_~n~0 ULTIMATE.start_main_~r~0)) [2021-10-20 05:26:13,880 INFO L857 garLoopResultBuilder]: For program point L12-21(lines 12 15) no Hoare annotation was computed. [2021-10-20 05:26:13,880 INFO L857 garLoopResultBuilder]: For program point ULTIMATE.startErr3ASSERT_VIOLATIONERROR_FUNCTION(line 14) no Hoare annotation was computed. [2021-10-20 05:26:13,880 INFO L853 garLoopResultBuilder]: At program point L12-23(lines 11 17) the Hoare annotation is: (and (= ULTIMATE.start_main_~p~0 0) (<= 1 ~counter~0) (= ULTIMATE.start_main_~h~0 0)) [2021-10-20 05:26:13,880 INFO L857 garLoopResultBuilder]: For program point L12-24(lines 12 15) no Hoare annotation was computed. [2021-10-20 05:26:13,881 INFO L860 garLoopResultBuilder]: At program point L12-26(lines 11 17) the Hoare annotation is: true [2021-10-20 05:26:13,881 INFO L857 garLoopResultBuilder]: For program point L13(lines 13 14) no Hoare annotation was computed. [2021-10-20 05:26:13,881 INFO L857 garLoopResultBuilder]: For program point L13-1(lines 13 14) no Hoare annotation was computed. [2021-10-20 05:26:13,881 INFO L857 garLoopResultBuilder]: For program point L13-2(lines 13 14) no Hoare annotation was computed. [2021-10-20 05:26:13,882 INFO L857 garLoopResultBuilder]: For program point L13-3(lines 13 14) no Hoare annotation was computed. [2021-10-20 05:26:13,882 INFO L857 garLoopResultBuilder]: For program point L13-4(lines 13 14) no Hoare annotation was computed. [2021-10-20 05:26:13,882 INFO L857 garLoopResultBuilder]: For program point L13-5(lines 13 14) no Hoare annotation was computed. [2021-10-20 05:26:13,883 INFO L857 garLoopResultBuilder]: For program point L13-6(lines 13 14) no Hoare annotation was computed. [2021-10-20 05:26:13,883 INFO L857 garLoopResultBuilder]: For program point L38(lines 38 56) no Hoare annotation was computed. [2021-10-20 05:26:13,883 INFO L857 garLoopResultBuilder]: For program point L13-7(lines 13 14) no Hoare annotation was computed. [2021-10-20 05:26:13,884 INFO L857 garLoopResultBuilder]: For program point L13-8(lines 13 14) no Hoare annotation was computed. [2021-10-20 05:26:13,884 INFO L857 garLoopResultBuilder]: For program point L38-2(lines 38 56) no Hoare annotation was computed. [2021-10-20 05:26:13,884 INFO L857 garLoopResultBuilder]: For program point ULTIMATE.startErr6ASSERT_VIOLATIONERROR_FUNCTION(line 14) no Hoare annotation was computed. [2021-10-20 05:26:13,885 INFO L857 garLoopResultBuilder]: For program point L30-1(lines 30 35) no Hoare annotation was computed. [2021-10-20 05:26:13,885 INFO L853 garLoopResultBuilder]: At program point L30-3(lines 30 35) the Hoare annotation is: (let ((.cse0 (= ULTIMATE.start_main_~p~0 0)) (.cse1 (= ULTIMATE.start_main_~h~0 0)) (.cse2 (= ULTIMATE.start_main_~n~0 ULTIMATE.start_main_~r~0))) (or (and .cse0 (= ~counter~0 0) .cse1 .cse2) (and .cse0 (<= 1 ~counter~0) .cse1 .cse2))) [2021-10-20 05:26:13,885 INFO L857 garLoopResultBuilder]: For program point L31(lines 31 32) no Hoare annotation was computed. [2021-10-20 05:26:13,885 INFO L857 garLoopResultBuilder]: For program point ULTIMATE.startErr5ASSERT_VIOLATIONERROR_FUNCTION(line 14) no Hoare annotation was computed. [2021-10-20 05:26:13,885 INFO L857 garLoopResultBuilder]: For program point ULTIMATE.startErr8ASSERT_VIOLATIONERROR_FUNCTION(line 14) no Hoare annotation was computed. [2021-10-20 05:26:13,886 INFO L857 garLoopResultBuilder]: For program point ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION(line 14) no Hoare annotation was computed. [2021-10-20 05:26:13,886 INFO L857 garLoopResultBuilder]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2021-10-20 05:26:13,886 INFO L857 garLoopResultBuilder]: For program point ULTIMATE.startErr7ASSERT_VIOLATIONERROR_FUNCTION(line 14) no Hoare annotation was computed. [2021-10-20 05:26:13,886 INFO L857 garLoopResultBuilder]: For program point ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION(line 14) no Hoare annotation was computed. [2021-10-20 05:26:13,891 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-10-20 05:26:13,909 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.10 05:26:13 BoogieIcfgContainer [2021-10-20 05:26:13,909 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-10-20 05:26:13,910 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-10-20 05:26:13,910 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-10-20 05:26:13,910 INFO L275 PluginConnector]: Witness Printer initialized [2021-10-20 05:26:13,910 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.10 05:26:10" (3/4) ... [2021-10-20 05:26:13,913 INFO L137 WitnessPrinter]: Generating witness for correct program [2021-10-20 05:26:13,937 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 19 nodes and edges [2021-10-20 05:26:13,938 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 5 nodes and edges [2021-10-20 05:26:13,939 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 2 nodes and edges [2021-10-20 05:26:13,939 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2021-10-20 05:26:14,002 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca7f33ff-dfb5-4b42-850e-522ff3ed7adb/bin/utaipan-tZwUujhuQw/witness.graphml [2021-10-20 05:26:14,003 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-10-20 05:26:14,004 INFO L168 Benchmark]: Toolchain (without parser) took 6804.56 ms. Allocated memory was 86.0 MB in the beginning and 111.1 MB in the end (delta: 25.2 MB). Free memory was 50.2 MB in the beginning and 55.1 MB in the end (delta: -4.9 MB). Peak memory consumption was 17.9 MB. Max. memory is 16.1 GB. [2021-10-20 05:26:14,005 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 86.0 MB. Free memory was 59.1 MB in the beginning and 59.1 MB in the end (delta: 21.0 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-10-20 05:26:14,006 INFO L168 Benchmark]: CACSL2BoogieTranslator took 306.54 ms. Allocated memory was 86.0 MB in the beginning and 111.1 MB in the end (delta: 25.2 MB). Free memory was 50.0 MB in the beginning and 84.2 MB in the end (delta: -34.2 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2021-10-20 05:26:14,006 INFO L168 Benchmark]: Boogie Procedure Inliner took 76.49 ms. Allocated memory is still 111.1 MB. Free memory was 84.2 MB in the beginning and 82.7 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-20 05:26:14,006 INFO L168 Benchmark]: Boogie Preprocessor took 49.66 ms. Allocated memory is still 111.1 MB. Free memory was 82.7 MB in the beginning and 81.1 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-20 05:26:14,007 INFO L168 Benchmark]: RCFGBuilder took 2683.24 ms. Allocated memory is still 111.1 MB. Free memory was 81.1 MB in the beginning and 65.4 MB in the end (delta: 15.8 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. [2021-10-20 05:26:14,007 INFO L168 Benchmark]: TraceAbstraction took 3588.44 ms. Allocated memory is still 111.1 MB. Free memory was 64.9 MB in the beginning and 59.3 MB in the end (delta: 5.6 MB). Peak memory consumption was 6.1 MB. Max. memory is 16.1 GB. [2021-10-20 05:26:14,007 INFO L168 Benchmark]: Witness Printer took 93.44 ms. Allocated memory is still 111.1 MB. Free memory was 59.3 MB in the beginning and 55.9 MB in the end (delta: 3.4 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. [2021-10-20 05:26:14,010 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 86.0 MB. Free memory was 59.1 MB in the beginning and 59.1 MB in the end (delta: 21.0 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 306.54 ms. Allocated memory was 86.0 MB in the beginning and 111.1 MB in the end (delta: 25.2 MB). Free memory was 50.0 MB in the beginning and 84.2 MB in the end (delta: -34.2 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 76.49 ms. Allocated memory is still 111.1 MB. Free memory was 84.2 MB in the beginning and 82.7 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 49.66 ms. Allocated memory is still 111.1 MB. Free memory was 82.7 MB in the beginning and 81.1 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 2683.24 ms. Allocated memory is still 111.1 MB. Free memory was 81.1 MB in the beginning and 65.4 MB in the end (delta: 15.8 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. * TraceAbstraction took 3588.44 ms. Allocated memory is still 111.1 MB. Free memory was 64.9 MB in the beginning and 59.3 MB in the end (delta: 5.6 MB). Peak memory consumption was 6.1 MB. Max. memory is 16.1 GB. * Witness Printer took 93.44 ms. Allocated memory is still 111.1 MB. Free memory was 59.3 MB in the beginning and 55.9 MB in the end (delta: 3.4 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0ms ErrorAutomatonConstructionTimeTotal, 0.0ms FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0ms ErrorAutomatonConstructionTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeAvg, 0.0ms ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - PositiveResult [Line: 14]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - PositiveResult [Line: 14]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - PositiveResult [Line: 14]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - PositiveResult [Line: 14]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - PositiveResult [Line: 14]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - PositiveResult [Line: 14]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - PositiveResult [Line: 14]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - PositiveResult [Line: 14]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - PositiveResult [Line: 14]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 44 locations, 9 error locations. Started 1 CEGAR loops. OverallTime: 3513.0ms, OverallIterations: 5, TraceHistogramMax: 1, EmptinessCheckTime: 11.4ms, AutomataDifference: 239.1ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 68.0ms, InitialAbstractionConstructionTime: 10.1ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 123 SDtfs, 37 SDslu, 138 SDs, 0 SdLazy, 45 SolverSat, 8 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 104.3ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 49 GetRequests, 32 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 635.7ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=44occurred in iteration=0, InterpolantAutomatonStates: 20, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 62.1ms AutomataMinimizationTime, 5 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: 0.0ms HoareAnnotationTime, 10 LocationsWithAnnotation, 10 PreInvPairs, 14 NumberOfFragments, 60 HoareAnnotationTreeSize, 10 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 29.0ms HoareSimplificationTime, 10 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 32.9ms HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 24.6ms SsaConstructionTime, 152.8ms SatisfiabilityAnalysisTime, 2226.9ms InterpolantComputationTime, 41 NumberOfCodeBlocks, 41 NumberOfCodeBlocksAsserted, 5 NumberOfCheckSat, 54 ConstructedInterpolants, 6 QuantifiedInterpolants, 494 SizeOfPredicates, 11 NumberOfNonLiveVariables, 133 ConjunctsInSsa, 14 ConjunctsInUnsatCore, 7 InterpolantComputations, 7 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available - AllSpecificationsHoldResult: All specifications hold 9 specifications checked. All of them hold - InvariantResult [Line: 11]: Loop Invariant Derived loop invariant: 0 - InvariantResult [Line: 11]: Loop Invariant Derived loop invariant: 0 - InvariantResult [Line: 11]: Loop Invariant Derived loop invariant: (p == 0 && 1 <= counter) && h == 0 - InvariantResult [Line: 11]: Loop Invariant Derived loop invariant: 0 - InvariantResult [Line: 11]: Loop Invariant Derived loop invariant: (((1 <= cond && p == 0) && 1 <= counter) && h == 0) && n == r - InvariantResult [Line: 11]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: 11]: Loop Invariant Derived loop invariant: 0 - InvariantResult [Line: 11]: Loop Invariant Derived loop invariant: 0 - InvariantResult [Line: 30]: Loop Invariant Derived loop invariant: (((p == 0 && counter == 0) && h == 0) && n == r) || (((p == 0 && 1 <= counter) && h == 0) && n == r) - InvariantResult [Line: 46]: Loop Invariant Derived loop invariant: 0 RESULT: Ultimate proved your program to be correct! [2021-10-20 05:26:14,038 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca7f33ff-dfb5-4b42-850e-522ff3ed7adb/bin/utaipan-tZwUujhuQw/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request...