./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/add_last-alloca-1.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 678e0110 Using bit-precise analysis Retrying with bit-precise analysis Calling Ultimate with: /usr/lib/jvm/java-8-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_4144f571-3244-44b5-8ab4-49b82118e29d/bin/uautomizer/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/run_dir_4144f571-3244-44b5-8ab4-49b82118e29d/bin/uautomizer/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_4144f571-3244-44b5-8ab4-49b82118e29d/bin/uautomizer/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_4144f571-3244-44b5-8ab4-49b82118e29d/bin/uautomizer/config/AutomizerMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/add_last-alloca-1.i -s /tmp/vcloud-vcloud-master/worker/run_dir_4144f571-3244-44b5-8ab4-49b82118e29d/bin/uautomizer/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_4144f571-3244-44b5-8ab4-49b82118e29d/bin/uautomizer --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash c8e64c1324249ca9b9e3c019cfc2046542af7b26 ...................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Result: ERROR: ExceptionOrErrorResult: AssertionError: incompatible size --- Real Ultimate output --- Skipped default analysis because property is memsafety ### Bit-precise run ### This is Ultimate 0.1.24-678e011 [2019-11-19 22:21:47,156 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-19 22:21:47,158 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-19 22:21:47,177 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-19 22:21:47,178 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-19 22:21:47,179 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-19 22:21:47,182 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-19 22:21:47,192 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-19 22:21:47,194 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-19 22:21:47,198 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-19 22:21:47,200 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-19 22:21:47,201 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-19 22:21:47,202 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-19 22:21:47,204 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-19 22:21:47,206 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-19 22:21:47,207 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-19 22:21:47,208 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-19 22:21:47,212 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-19 22:21:47,215 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-19 22:21:47,218 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-19 22:21:47,222 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-19 22:21:47,225 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-19 22:21:47,228 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-19 22:21:47,229 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-19 22:21:47,233 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-11-19 22:21:47,233 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-11-19 22:21:47,234 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-11-19 22:21:47,236 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-11-19 22:21:47,237 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-11-19 22:21:47,239 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-11-19 22:21:47,239 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-11-19 22:21:47,240 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-11-19 22:21:47,240 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-11-19 22:21:47,242 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-11-19 22:21:47,243 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-11-19 22:21:47,244 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-11-19 22:21:47,244 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-11-19 22:21:47,244 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-11-19 22:21:47,245 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-19 22:21:47,246 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-19 22:21:47,247 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-19 22:21:47,248 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_4144f571-3244-44b5-8ab4-49b82118e29d/bin/uautomizer/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Bitvector.epf [2019-11-19 22:21:47,275 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-19 22:21:47,286 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-19 22:21:47,287 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-19 22:21:47,288 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-19 22:21:47,288 INFO L138 SettingsManager]: * Use SBE=true [2019-11-19 22:21:47,288 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-19 22:21:47,289 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-19 22:21:47,289 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2019-11-19 22:21:47,289 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-19 22:21:47,289 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-19 22:21:47,290 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-19 22:21:47,290 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2019-11-19 22:21:47,290 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2019-11-19 22:21:47,290 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2019-11-19 22:21:47,291 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-19 22:21:47,291 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2019-11-19 22:21:47,291 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2019-11-19 22:21:47,291 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-19 22:21:47,292 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-19 22:21:47,292 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-19 22:21:47,292 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-19 22:21:47,292 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-19 22:21:47,293 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-19 22:21:47,293 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-19 22:21:47,293 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-19 22:21:47,296 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-19 22:21:47,296 INFO L138 SettingsManager]: * Trace refinement strategy=WOLF [2019-11-19 22:21:47,296 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --rewrite-divk --print-success --lang smt [2019-11-19 22:21:47,297 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-19 22:21:47,297 INFO L138 SettingsManager]: * Logic for external solver=AUFBV Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_4144f571-3244-44b5-8ab4-49b82118e29d/bin/uautomizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> c8e64c1324249ca9b9e3c019cfc2046542af7b26 [2019-11-19 22:21:47,447 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-19 22:21:47,465 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-19 22:21:47,468 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-19 22:21:47,473 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-19 22:21:47,476 INFO L275 PluginConnector]: CDTParser initialized [2019-11-19 22:21:47,476 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_4144f571-3244-44b5-8ab4-49b82118e29d/bin/uautomizer/../../sv-benchmarks/c/array-memsafety/add_last-alloca-1.i [2019-11-19 22:21:47,547 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_4144f571-3244-44b5-8ab4-49b82118e29d/bin/uautomizer/data/b0ffe0b52/5c586d95312e466097f20edf3c51903c/FLAG5e3235df0 [2019-11-19 22:21:48,066 INFO L306 CDTParser]: Found 1 translation units. [2019-11-19 22:21:48,066 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_4144f571-3244-44b5-8ab4-49b82118e29d/sv-benchmarks/c/array-memsafety/add_last-alloca-1.i [2019-11-19 22:21:48,080 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_4144f571-3244-44b5-8ab4-49b82118e29d/bin/uautomizer/data/b0ffe0b52/5c586d95312e466097f20edf3c51903c/FLAG5e3235df0 [2019-11-19 22:21:48,412 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_4144f571-3244-44b5-8ab4-49b82118e29d/bin/uautomizer/data/b0ffe0b52/5c586d95312e466097f20edf3c51903c [2019-11-19 22:21:48,414 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-19 22:21:48,415 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2019-11-19 22:21:48,416 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-19 22:21:48,416 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-19 22:21:48,420 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-19 22:21:48,421 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 10:21:48" (1/1) ... [2019-11-19 22:21:48,424 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@63abf4e2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 10:21:48, skipping insertion in model container [2019-11-19 22:21:48,424 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 10:21:48" (1/1) ... [2019-11-19 22:21:48,433 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-19 22:21:48,486 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-19 22:21:48,883 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-19 22:21:48,896 INFO L188 MainTranslator]: Completed pre-run [2019-11-19 22:21:48,943 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-19 22:21:48,998 INFO L192 MainTranslator]: Completed translation [2019-11-19 22:21:48,999 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 10:21:48 WrapperNode [2019-11-19 22:21:48,999 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-19 22:21:49,000 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-19 22:21:49,000 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-19 22:21:49,000 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-19 22:21:49,013 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 10:21:48" (1/1) ... [2019-11-19 22:21:49,014 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 10:21:48" (1/1) ... [2019-11-19 22:21:49,035 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 10:21:48" (1/1) ... [2019-11-19 22:21:49,035 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 10:21:48" (1/1) ... [2019-11-19 22:21:49,052 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 10:21:48" (1/1) ... [2019-11-19 22:21:49,057 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 10:21:48" (1/1) ... [2019-11-19 22:21:49,061 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 10:21:48" (1/1) ... [2019-11-19 22:21:49,069 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-19 22:21:49,069 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-19 22:21:49,070 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-19 22:21:49,070 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-19 22:21:49,071 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 10:21:48" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_4144f571-3244-44b5-8ab4-49b82118e29d/bin/uautomizer/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-19 22:21:49,137 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-19 22:21:49,137 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-19 22:21:49,138 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_32 [2019-11-19 22:21:49,138 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_64 [2019-11-19 22:21:49,138 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint16_identity [2019-11-19 22:21:49,139 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint32_identity [2019-11-19 22:21:49,139 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint64_identity [2019-11-19 22:21:49,139 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-19 22:21:49,139 INFO L130 BoogieDeclarations]: Found specification of procedure __ctype_get_mb_cur_max [2019-11-19 22:21:49,140 INFO L130 BoogieDeclarations]: Found specification of procedure atof [2019-11-19 22:21:49,141 INFO L130 BoogieDeclarations]: Found specification of procedure atoi [2019-11-19 22:21:49,141 INFO L130 BoogieDeclarations]: Found specification of procedure atol [2019-11-19 22:21:49,141 INFO L130 BoogieDeclarations]: Found specification of procedure atoll [2019-11-19 22:21:49,141 INFO L130 BoogieDeclarations]: Found specification of procedure strtod [2019-11-19 22:21:49,141 INFO L130 BoogieDeclarations]: Found specification of procedure strtof [2019-11-19 22:21:49,142 INFO L130 BoogieDeclarations]: Found specification of procedure strtold [2019-11-19 22:21:49,142 INFO L130 BoogieDeclarations]: Found specification of procedure strtol [2019-11-19 22:21:49,142 INFO L130 BoogieDeclarations]: Found specification of procedure strtoul [2019-11-19 22:21:49,142 INFO L130 BoogieDeclarations]: Found specification of procedure strtoq [2019-11-19 22:21:49,142 INFO L130 BoogieDeclarations]: Found specification of procedure strtouq [2019-11-19 22:21:49,144 INFO L130 BoogieDeclarations]: Found specification of procedure strtoll [2019-11-19 22:21:49,144 INFO L130 BoogieDeclarations]: Found specification of procedure strtoull [2019-11-19 22:21:49,144 INFO L130 BoogieDeclarations]: Found specification of procedure l64a [2019-11-19 22:21:49,144 INFO L130 BoogieDeclarations]: Found specification of procedure a64l [2019-11-19 22:21:49,145 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_32 [2019-11-19 22:21:49,146 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_64 [2019-11-19 22:21:49,146 INFO L130 BoogieDeclarations]: Found specification of procedure __uint16_identity [2019-11-19 22:21:49,147 INFO L130 BoogieDeclarations]: Found specification of procedure __uint32_identity [2019-11-19 22:21:49,147 INFO L130 BoogieDeclarations]: Found specification of procedure __uint64_identity [2019-11-19 22:21:49,147 INFO L130 BoogieDeclarations]: Found specification of procedure select [2019-11-19 22:21:49,147 INFO L130 BoogieDeclarations]: Found specification of procedure pselect [2019-11-19 22:21:49,147 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_major [2019-11-19 22:21:49,147 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_minor [2019-11-19 22:21:49,148 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_makedev [2019-11-19 22:21:49,148 INFO L130 BoogieDeclarations]: Found specification of procedure random [2019-11-19 22:21:49,148 INFO L130 BoogieDeclarations]: Found specification of procedure srandom [2019-11-19 22:21:49,148 INFO L130 BoogieDeclarations]: Found specification of procedure initstate [2019-11-19 22:21:49,148 INFO L130 BoogieDeclarations]: Found specification of procedure setstate [2019-11-19 22:21:49,148 INFO L130 BoogieDeclarations]: Found specification of procedure random_r [2019-11-19 22:21:49,149 INFO L130 BoogieDeclarations]: Found specification of procedure srandom_r [2019-11-19 22:21:49,149 INFO L130 BoogieDeclarations]: Found specification of procedure initstate_r [2019-11-19 22:21:49,149 INFO L130 BoogieDeclarations]: Found specification of procedure setstate_r [2019-11-19 22:21:49,149 INFO L130 BoogieDeclarations]: Found specification of procedure rand [2019-11-19 22:21:49,149 INFO L130 BoogieDeclarations]: Found specification of procedure srand [2019-11-19 22:21:49,149 INFO L130 BoogieDeclarations]: Found specification of procedure rand_r [2019-11-19 22:21:49,149 INFO L130 BoogieDeclarations]: Found specification of procedure drand48 [2019-11-19 22:21:49,150 INFO L130 BoogieDeclarations]: Found specification of procedure erand48 [2019-11-19 22:21:49,150 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48 [2019-11-19 22:21:49,150 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48 [2019-11-19 22:21:49,150 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48 [2019-11-19 22:21:49,150 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48 [2019-11-19 22:21:49,150 INFO L130 BoogieDeclarations]: Found specification of procedure srand48 [2019-11-19 22:21:49,151 INFO L130 BoogieDeclarations]: Found specification of procedure seed48 [2019-11-19 22:21:49,151 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48 [2019-11-19 22:21:49,151 INFO L130 BoogieDeclarations]: Found specification of procedure drand48_r [2019-11-19 22:21:49,151 INFO L130 BoogieDeclarations]: Found specification of procedure erand48_r [2019-11-19 22:21:49,151 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48_r [2019-11-19 22:21:49,152 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48_r [2019-11-19 22:21:49,152 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48_r [2019-11-19 22:21:49,152 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48_r [2019-11-19 22:21:49,152 INFO L130 BoogieDeclarations]: Found specification of procedure srand48_r [2019-11-19 22:21:49,153 INFO L130 BoogieDeclarations]: Found specification of procedure seed48_r [2019-11-19 22:21:49,153 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48_r [2019-11-19 22:21:49,153 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2019-11-19 22:21:49,153 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2019-11-19 22:21:49,153 INFO L130 BoogieDeclarations]: Found specification of procedure realloc [2019-11-19 22:21:49,153 INFO L130 BoogieDeclarations]: Found specification of procedure free [2019-11-19 22:21:49,155 INFO L130 BoogieDeclarations]: Found specification of procedure alloca [2019-11-19 22:21:49,155 INFO L130 BoogieDeclarations]: Found specification of procedure valloc [2019-11-19 22:21:49,155 INFO L130 BoogieDeclarations]: Found specification of procedure posix_memalign [2019-11-19 22:21:49,155 INFO L130 BoogieDeclarations]: Found specification of procedure aligned_alloc [2019-11-19 22:21:49,156 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2019-11-19 22:21:49,156 INFO L130 BoogieDeclarations]: Found specification of procedure atexit [2019-11-19 22:21:49,157 INFO L130 BoogieDeclarations]: Found specification of procedure at_quick_exit [2019-11-19 22:21:49,159 INFO L130 BoogieDeclarations]: Found specification of procedure on_exit [2019-11-19 22:21:49,159 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2019-11-19 22:21:49,159 INFO L130 BoogieDeclarations]: Found specification of procedure quick_exit [2019-11-19 22:21:49,159 INFO L130 BoogieDeclarations]: Found specification of procedure _Exit [2019-11-19 22:21:49,159 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2019-11-19 22:21:49,160 INFO L130 BoogieDeclarations]: Found specification of procedure putenv [2019-11-19 22:21:49,160 INFO L130 BoogieDeclarations]: Found specification of procedure setenv [2019-11-19 22:21:49,161 INFO L130 BoogieDeclarations]: Found specification of procedure unsetenv [2019-11-19 22:21:49,161 INFO L130 BoogieDeclarations]: Found specification of procedure clearenv [2019-11-19 22:21:49,161 INFO L130 BoogieDeclarations]: Found specification of procedure mktemp [2019-11-19 22:21:49,162 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemp [2019-11-19 22:21:49,162 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemps [2019-11-19 22:21:49,162 INFO L130 BoogieDeclarations]: Found specification of procedure mkdtemp [2019-11-19 22:21:49,162 INFO L130 BoogieDeclarations]: Found specification of procedure system [2019-11-19 22:21:49,162 INFO L130 BoogieDeclarations]: Found specification of procedure realpath [2019-11-19 22:21:49,162 INFO L130 BoogieDeclarations]: Found specification of procedure bsearch [2019-11-19 22:21:49,163 INFO L130 BoogieDeclarations]: Found specification of procedure qsort [2019-11-19 22:21:49,163 INFO L130 BoogieDeclarations]: Found specification of procedure abs [2019-11-19 22:21:49,163 INFO L130 BoogieDeclarations]: Found specification of procedure labs [2019-11-19 22:21:49,163 INFO L130 BoogieDeclarations]: Found specification of procedure llabs [2019-11-19 22:21:49,163 INFO L130 BoogieDeclarations]: Found specification of procedure div [2019-11-19 22:21:49,163 INFO L130 BoogieDeclarations]: Found specification of procedure ldiv [2019-11-19 22:21:49,164 INFO L130 BoogieDeclarations]: Found specification of procedure lldiv [2019-11-19 22:21:49,164 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt [2019-11-19 22:21:49,164 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt [2019-11-19 22:21:49,164 INFO L130 BoogieDeclarations]: Found specification of procedure gcvt [2019-11-19 22:21:49,164 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt [2019-11-19 22:21:49,164 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt [2019-11-19 22:21:49,165 INFO L130 BoogieDeclarations]: Found specification of procedure qgcvt [2019-11-19 22:21:49,165 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt_r [2019-11-19 22:21:49,165 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt_r [2019-11-19 22:21:49,165 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt_r [2019-11-19 22:21:49,165 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt_r [2019-11-19 22:21:49,166 INFO L130 BoogieDeclarations]: Found specification of procedure mblen [2019-11-19 22:21:49,166 INFO L130 BoogieDeclarations]: Found specification of procedure mbtowc [2019-11-19 22:21:49,166 INFO L130 BoogieDeclarations]: Found specification of procedure wctomb [2019-11-19 22:21:49,166 INFO L130 BoogieDeclarations]: Found specification of procedure mbstowcs [2019-11-19 22:21:49,166 INFO L130 BoogieDeclarations]: Found specification of procedure wcstombs [2019-11-19 22:21:49,166 INFO L130 BoogieDeclarations]: Found specification of procedure rpmatch [2019-11-19 22:21:49,167 INFO L130 BoogieDeclarations]: Found specification of procedure getsubopt [2019-11-19 22:21:49,167 INFO L130 BoogieDeclarations]: Found specification of procedure getloadavg [2019-11-19 22:21:49,168 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-11-19 22:21:49,168 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-19 22:21:49,169 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-19 22:21:49,169 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-19 22:21:49,170 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4 [2019-11-19 22:21:49,170 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE4 [2019-11-19 22:21:49,170 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-19 22:21:49,171 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-19 22:21:49,871 INFO L280 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-19 22:21:49,872 INFO L285 CfgBuilder]: Removed 2 assume(true) statements. [2019-11-19 22:21:49,873 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 10:21:49 BoogieIcfgContainer [2019-11-19 22:21:49,873 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-19 22:21:49,874 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-19 22:21:49,874 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-19 22:21:49,877 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-19 22:21:49,878 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 10:21:48" (1/3) ... [2019-11-19 22:21:49,879 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1cb65312 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 10:21:49, skipping insertion in model container [2019-11-19 22:21:49,879 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 10:21:48" (2/3) ... [2019-11-19 22:21:49,880 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1cb65312 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 10:21:49, skipping insertion in model container [2019-11-19 22:21:49,880 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 10:21:49" (3/3) ... [2019-11-19 22:21:49,882 INFO L109 eAbstractionObserver]: Analyzing ICFG add_last-alloca-1.i [2019-11-19 22:21:49,892 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-19 22:21:49,900 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 13 error locations. [2019-11-19 22:21:49,910 INFO L249 AbstractCegarLoop]: Starting to check reachability of 13 error locations. [2019-11-19 22:21:49,930 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-19 22:21:49,930 INFO L374 AbstractCegarLoop]: Hoare is false [2019-11-19 22:21:49,930 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-19 22:21:49,930 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-19 22:21:49,931 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-19 22:21:49,931 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-19 22:21:49,932 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-19 22:21:49,932 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-19 22:21:49,947 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states. [2019-11-19 22:21:49,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-11-19 22:21:49,957 INFO L402 BasicCegarLoop]: Found error trace [2019-11-19 22:21:49,958 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-19 22:21:49,958 INFO L410 AbstractCegarLoop]: === Iteration 1 === [mainErr8REQUIRES_VIOLATION, mainErr9REQUIRES_VIOLATION, mainErr5REQUIRES_VIOLATION, mainErr6REQUIRES_VIOLATION, mainErr7REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr12ENSURES_VIOLATIONMEMORY_LEAK, mainErr4REQUIRES_VIOLATION, mainErr10REQUIRES_VIOLATION, mainErr11REQUIRES_VIOLATION, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION]=== [2019-11-19 22:21:49,964 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-19 22:21:49,965 INFO L82 PathProgramCache]: Analyzing trace with hash -2072257551, now seen corresponding path program 1 times [2019-11-19 22:21:49,976 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-19 22:21:49,977 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [835436382] [2019-11-19 22:21:49,977 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_4144f571-3244-44b5-8ab4-49b82118e29d/bin/uautomizer/cvc4 Starting monitored process 2 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-19 22:21:50,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-19 22:21:50,184 INFO L255 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-19 22:21:50,188 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-19 22:21:50,232 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-19 22:21:50,232 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-19 22:21:50,252 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-19 22:21:50,253 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [835436382] [2019-11-19 22:21:50,254 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-19 22:21:50,254 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2019-11-19 22:21:50,255 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [562531896] [2019-11-19 22:21:50,260 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-19 22:21:50,260 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-19 22:21:50,277 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-19 22:21:50,277 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-19 22:21:50,280 INFO L87 Difference]: Start difference. First operand 38 states. Second operand 3 states. [2019-11-19 22:21:50,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-19 22:21:50,353 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2019-11-19 22:21:50,354 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-19 22:21:50,355 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2019-11-19 22:21:50,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-19 22:21:50,363 INFO L225 Difference]: With dead ends: 38 [2019-11-19 22:21:50,363 INFO L226 Difference]: Without dead ends: 35 [2019-11-19 22:21:50,367 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-19 22:21:50,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2019-11-19 22:21:50,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2019-11-19 22:21:50,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2019-11-19 22:21:50,397 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2019-11-19 22:21:50,398 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 10 [2019-11-19 22:21:50,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-19 22:21:50,399 INFO L462 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2019-11-19 22:21:50,399 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-19 22:21:50,399 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2019-11-19 22:21:50,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2019-11-19 22:21:50,400 INFO L402 BasicCegarLoop]: Found error trace [2019-11-19 22:21:50,400 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-19 22:21:50,605 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-19 22:21:50,605 INFO L410 AbstractCegarLoop]: === Iteration 2 === [mainErr8REQUIRES_VIOLATION, mainErr9REQUIRES_VIOLATION, mainErr5REQUIRES_VIOLATION, mainErr6REQUIRES_VIOLATION, mainErr7REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr12ENSURES_VIOLATIONMEMORY_LEAK, mainErr4REQUIRES_VIOLATION, mainErr10REQUIRES_VIOLATION, mainErr11REQUIRES_VIOLATION, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION]=== [2019-11-19 22:21:50,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-19 22:21:50,606 INFO L82 PathProgramCache]: Analyzing trace with hash 184525090, now seen corresponding path program 1 times [2019-11-19 22:21:50,606 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-19 22:21:50,606 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [761517367] [2019-11-19 22:21:50,606 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_4144f571-3244-44b5-8ab4-49b82118e29d/bin/uautomizer/cvc4 Starting monitored process 3 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-19 22:21:50,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-19 22:21:50,759 INFO L255 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-19 22:21:50,761 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-19 22:21:50,788 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-19 22:21:50,789 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-19 22:21:50,831 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-19 22:21:50,831 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [761517367] [2019-11-19 22:21:50,831 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-19 22:21:50,832 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2019-11-19 22:21:50,832 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [363580779] [2019-11-19 22:21:50,833 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-19 22:21:50,834 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-19 22:21:50,834 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-19 22:21:50,834 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2019-11-19 22:21:50,834 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand 6 states. [2019-11-19 22:21:51,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-19 22:21:51,114 INFO L93 Difference]: Finished difference Result 70 states and 73 transitions. [2019-11-19 22:21:51,117 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-19 22:21:51,117 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 11 [2019-11-19 22:21:51,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-19 22:21:51,119 INFO L225 Difference]: With dead ends: 70 [2019-11-19 22:21:51,119 INFO L226 Difference]: Without dead ends: 70 [2019-11-19 22:21:51,120 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=25, Invalid=31, Unknown=0, NotChecked=0, Total=56 [2019-11-19 22:21:51,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2019-11-19 22:21:51,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 36. [2019-11-19 22:21:51,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2019-11-19 22:21:51,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2019-11-19 22:21:51,127 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 11 [2019-11-19 22:21:51,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-19 22:21:51,127 INFO L462 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2019-11-19 22:21:51,128 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-19 22:21:51,128 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2019-11-19 22:21:51,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2019-11-19 22:21:51,128 INFO L402 BasicCegarLoop]: Found error trace [2019-11-19 22:21:51,128 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-19 22:21:51,332 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-19 22:21:51,332 INFO L410 AbstractCegarLoop]: === Iteration 3 === [mainErr8REQUIRES_VIOLATION, mainErr9REQUIRES_VIOLATION, mainErr5REQUIRES_VIOLATION, mainErr6REQUIRES_VIOLATION, mainErr7REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr12ENSURES_VIOLATIONMEMORY_LEAK, mainErr4REQUIRES_VIOLATION, mainErr10REQUIRES_VIOLATION, mainErr11REQUIRES_VIOLATION, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION]=== [2019-11-19 22:21:51,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-19 22:21:51,332 INFO L82 PathProgramCache]: Analyzing trace with hash 184525140, now seen corresponding path program 1 times [2019-11-19 22:21:51,333 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-19 22:21:51,333 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [1423811249] [2019-11-19 22:21:51,333 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_4144f571-3244-44b5-8ab4-49b82118e29d/bin/uautomizer/cvc4 Starting monitored process 4 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-19 22:21:51,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-19 22:21:51,507 INFO L255 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-19 22:21:51,509 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-19 22:21:51,566 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-11-19 22:21:51,571 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-19 22:21:51,575 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-19 22:21:51,576 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-19 22:21:51,576 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:6, output treesize:5 [2019-11-19 22:21:51,585 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-19 22:21:51,585 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-19 22:21:51,598 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-19 22:21:51,598 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1423811249] [2019-11-19 22:21:51,598 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-19 22:21:51,598 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2019-11-19 22:21:51,599 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [149127407] [2019-11-19 22:21:51,599 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-19 22:21:51,599 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-19 22:21:51,600 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-19 22:21:51,600 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-19 22:21:51,600 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 3 states. [2019-11-19 22:21:51,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-19 22:21:51,692 INFO L93 Difference]: Finished difference Result 33 states and 35 transitions. [2019-11-19 22:21:51,692 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-19 22:21:51,692 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2019-11-19 22:21:51,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-19 22:21:51,693 INFO L225 Difference]: With dead ends: 33 [2019-11-19 22:21:51,693 INFO L226 Difference]: Without dead ends: 33 [2019-11-19 22:21:51,694 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-19 22:21:51,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2019-11-19 22:21:51,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2019-11-19 22:21:51,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2019-11-19 22:21:51,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2019-11-19 22:21:51,699 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 11 [2019-11-19 22:21:51,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-19 22:21:51,700 INFO L462 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2019-11-19 22:21:51,700 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-19 22:21:51,700 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2019-11-19 22:21:51,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2019-11-19 22:21:51,701 INFO L402 BasicCegarLoop]: Found error trace [2019-11-19 22:21:51,701 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-19 22:21:51,903 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-19 22:21:51,904 INFO L410 AbstractCegarLoop]: === Iteration 4 === [mainErr8REQUIRES_VIOLATION, mainErr9REQUIRES_VIOLATION, mainErr5REQUIRES_VIOLATION, mainErr6REQUIRES_VIOLATION, mainErr7REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr12ENSURES_VIOLATIONMEMORY_LEAK, mainErr4REQUIRES_VIOLATION, mainErr10REQUIRES_VIOLATION, mainErr11REQUIRES_VIOLATION, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION]=== [2019-11-19 22:21:51,904 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-19 22:21:51,904 INFO L82 PathProgramCache]: Analyzing trace with hash 184525141, now seen corresponding path program 1 times [2019-11-19 22:21:51,904 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-19 22:21:51,905 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [296689043] [2019-11-19 22:21:51,905 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_4144f571-3244-44b5-8ab4-49b82118e29d/bin/uautomizer/cvc4 Starting monitored process 5 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-19 22:21:52,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-19 22:21:52,096 INFO L255 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 7 conjunts are in the unsatisfiable core [2019-11-19 22:21:52,098 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-19 22:21:52,118 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-11-19 22:21:52,118 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-19 22:21:52,129 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-19 22:21:52,130 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-19 22:21:52,130 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:10, output treesize:9 [2019-11-19 22:21:52,178 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-19 22:21:52,179 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-19 22:21:52,409 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-19 22:21:52,410 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [296689043] [2019-11-19 22:21:52,410 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-19 22:21:52,410 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 7 [2019-11-19 22:21:52,410 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1010789008] [2019-11-19 22:21:52,411 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-11-19 22:21:52,411 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-19 22:21:52,411 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-11-19 22:21:52,412 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2019-11-19 22:21:52,412 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand 8 states. [2019-11-19 22:21:53,000 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-19 22:21:53,000 INFO L93 Difference]: Finished difference Result 61 states and 64 transitions. [2019-11-19 22:21:53,001 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-11-19 22:21:53,001 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 11 [2019-11-19 22:21:53,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-19 22:21:53,002 INFO L225 Difference]: With dead ends: 61 [2019-11-19 22:21:53,002 INFO L226 Difference]: Without dead ends: 61 [2019-11-19 22:21:53,003 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=57, Invalid=99, Unknown=0, NotChecked=0, Total=156 [2019-11-19 22:21:53,004 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2019-11-19 22:21:53,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 49. [2019-11-19 22:21:53,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2019-11-19 22:21:53,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 60 transitions. [2019-11-19 22:21:53,011 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 60 transitions. Word has length 11 [2019-11-19 22:21:53,011 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-19 22:21:53,011 INFO L462 AbstractCegarLoop]: Abstraction has 49 states and 60 transitions. [2019-11-19 22:21:53,011 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-11-19 22:21:53,012 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 60 transitions. [2019-11-19 22:21:53,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-11-19 22:21:53,012 INFO L402 BasicCegarLoop]: Found error trace [2019-11-19 22:21:53,013 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-19 22:21:53,215 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-19 22:21:53,215 INFO L410 AbstractCegarLoop]: === Iteration 5 === [mainErr8REQUIRES_VIOLATION, mainErr9REQUIRES_VIOLATION, mainErr5REQUIRES_VIOLATION, mainErr6REQUIRES_VIOLATION, mainErr7REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr12ENSURES_VIOLATIONMEMORY_LEAK, mainErr4REQUIRES_VIOLATION, mainErr10REQUIRES_VIOLATION, mainErr11REQUIRES_VIOLATION, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION]=== [2019-11-19 22:21:53,215 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-19 22:21:53,215 INFO L82 PathProgramCache]: Analyzing trace with hash 1424447077, now seen corresponding path program 1 times [2019-11-19 22:21:53,216 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-19 22:21:53,216 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [2034936098] [2019-11-19 22:21:53,216 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_4144f571-3244-44b5-8ab4-49b82118e29d/bin/uautomizer/cvc4 Starting monitored process 6 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-19 22:21:53,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-19 22:21:53,405 INFO L255 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-19 22:21:53,407 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-19 22:21:53,413 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-11-19 22:21:53,414 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-19 22:21:53,416 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-19 22:21:53,416 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-19 22:21:53,416 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:6, output treesize:5 [2019-11-19 22:21:53,439 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-19 22:21:53,439 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-19 22:21:53,461 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-19 22:21:53,461 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2034936098] [2019-11-19 22:21:53,461 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2019-11-19 22:21:53,461 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 5 [2019-11-19 22:21:53,462 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [311311375] [2019-11-19 22:21:53,462 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-19 22:21:53,462 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-19 22:21:53,462 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-19 22:21:53,463 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2019-11-19 22:21:53,463 INFO L87 Difference]: Start difference. First operand 49 states and 60 transitions. Second operand 4 states. [2019-11-19 22:21:53,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-19 22:21:53,537 INFO L93 Difference]: Finished difference Result 46 states and 54 transitions. [2019-11-19 22:21:53,538 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-19 22:21:53,538 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 15 [2019-11-19 22:21:53,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-19 22:21:53,539 INFO L225 Difference]: With dead ends: 46 [2019-11-19 22:21:53,539 INFO L226 Difference]: Without dead ends: 46 [2019-11-19 22:21:53,539 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2019-11-19 22:21:53,540 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2019-11-19 22:21:53,544 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2019-11-19 22:21:53,544 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2019-11-19 22:21:53,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 54 transitions. [2019-11-19 22:21:53,545 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 54 transitions. Word has length 15 [2019-11-19 22:21:53,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-19 22:21:53,546 INFO L462 AbstractCegarLoop]: Abstraction has 46 states and 54 transitions. [2019-11-19 22:21:53,546 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-19 22:21:53,546 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 54 transitions. [2019-11-19 22:21:53,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-11-19 22:21:53,547 INFO L402 BasicCegarLoop]: Found error trace [2019-11-19 22:21:53,547 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-19 22:21:53,749 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-19 22:21:53,749 INFO L410 AbstractCegarLoop]: === Iteration 6 === [mainErr8REQUIRES_VIOLATION, mainErr9REQUIRES_VIOLATION, mainErr5REQUIRES_VIOLATION, mainErr6REQUIRES_VIOLATION, mainErr7REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr12ENSURES_VIOLATIONMEMORY_LEAK, mainErr4REQUIRES_VIOLATION, mainErr10REQUIRES_VIOLATION, mainErr11REQUIRES_VIOLATION, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION]=== [2019-11-19 22:21:53,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-19 22:21:53,750 INFO L82 PathProgramCache]: Analyzing trace with hash 1424447078, now seen corresponding path program 1 times [2019-11-19 22:21:53,750 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-19 22:21:53,751 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [159273253] [2019-11-19 22:21:53,751 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_4144f571-3244-44b5-8ab4-49b82118e29d/bin/uautomizer/cvc4 Starting monitored process 7 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-19 22:21:53,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-19 22:21:53,939 INFO L255 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 8 conjunts are in the unsatisfiable core [2019-11-19 22:21:53,940 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-19 22:21:53,959 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-11-19 22:21:53,959 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-19 22:21:53,966 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-19 22:21:53,967 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-19 22:21:53,967 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:10, output treesize:9 [2019-11-19 22:21:53,995 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-19 22:21:53,995 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-19 22:21:54,113 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-19 22:21:54,113 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [159273253] [2019-11-19 22:21:54,114 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-19 22:21:54,114 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 7 [2019-11-19 22:21:54,114 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [232188587] [2019-11-19 22:21:54,114 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-11-19 22:21:54,114 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-19 22:21:54,115 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-11-19 22:21:54,115 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2019-11-19 22:21:54,115 INFO L87 Difference]: Start difference. First operand 46 states and 54 transitions. Second operand 8 states. [2019-11-19 22:21:54,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-19 22:21:54,579 INFO L93 Difference]: Finished difference Result 60 states and 63 transitions. [2019-11-19 22:21:54,580 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-11-19 22:21:54,580 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 15 [2019-11-19 22:21:54,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-19 22:21:54,581 INFO L225 Difference]: With dead ends: 60 [2019-11-19 22:21:54,581 INFO L226 Difference]: Without dead ends: 60 [2019-11-19 22:21:54,582 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=55, Invalid=101, Unknown=0, NotChecked=0, Total=156 [2019-11-19 22:21:54,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2019-11-19 22:21:54,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 46. [2019-11-19 22:21:54,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2019-11-19 22:21:54,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 52 transitions. [2019-11-19 22:21:54,587 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 52 transitions. Word has length 15 [2019-11-19 22:21:54,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-19 22:21:54,587 INFO L462 AbstractCegarLoop]: Abstraction has 46 states and 52 transitions. [2019-11-19 22:21:54,587 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-11-19 22:21:54,587 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 52 transitions. [2019-11-19 22:21:54,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-11-19 22:21:54,588 INFO L402 BasicCegarLoop]: Found error trace [2019-11-19 22:21:54,588 INFO L410 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-19 22:21:54,789 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-19 22:21:54,794 INFO L410 AbstractCegarLoop]: === Iteration 7 === [mainErr8REQUIRES_VIOLATION, mainErr9REQUIRES_VIOLATION, mainErr5REQUIRES_VIOLATION, mainErr6REQUIRES_VIOLATION, mainErr7REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr12ENSURES_VIOLATIONMEMORY_LEAK, mainErr4REQUIRES_VIOLATION, mainErr10REQUIRES_VIOLATION, mainErr11REQUIRES_VIOLATION, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION]=== [2019-11-19 22:21:54,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-19 22:21:54,795 INFO L82 PathProgramCache]: Analyzing trace with hash 1424447128, now seen corresponding path program 1 times [2019-11-19 22:21:54,795 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-19 22:21:54,795 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [1659451397] [2019-11-19 22:21:54,795 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_4144f571-3244-44b5-8ab4-49b82118e29d/bin/uautomizer/cvc4 Starting monitored process 8 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-19 22:21:54,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-19 22:21:54,974 INFO L255 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-19 22:21:54,975 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-19 22:21:55,012 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-19 22:21:55,012 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-19 22:21:55,055 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-19 22:21:55,055 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1659451397] [2019-11-19 22:21:55,055 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-19 22:21:55,055 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2019-11-19 22:21:55,055 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1963673507] [2019-11-19 22:21:55,056 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-11-19 22:21:55,056 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-19 22:21:55,056 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-11-19 22:21:55,056 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2019-11-19 22:21:55,056 INFO L87 Difference]: Start difference. First operand 46 states and 52 transitions. Second operand 8 states. [2019-11-19 22:21:55,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-19 22:21:55,171 INFO L93 Difference]: Finished difference Result 49 states and 51 transitions. [2019-11-19 22:21:55,172 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-19 22:21:55,172 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 15 [2019-11-19 22:21:55,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-19 22:21:55,173 INFO L225 Difference]: With dead ends: 49 [2019-11-19 22:21:55,173 INFO L226 Difference]: Without dead ends: 49 [2019-11-19 22:21:55,173 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2019-11-19 22:21:55,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2019-11-19 22:21:55,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 45. [2019-11-19 22:21:55,179 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2019-11-19 22:21:55,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 49 transitions. [2019-11-19 22:21:55,180 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 49 transitions. Word has length 15 [2019-11-19 22:21:55,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-19 22:21:55,180 INFO L462 AbstractCegarLoop]: Abstraction has 45 states and 49 transitions. [2019-11-19 22:21:55,181 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-11-19 22:21:55,181 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 49 transitions. [2019-11-19 22:21:55,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-11-19 22:21:55,181 INFO L402 BasicCegarLoop]: Found error trace [2019-11-19 22:21:55,182 INFO L410 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-19 22:21:55,383 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-19 22:21:55,384 INFO L410 AbstractCegarLoop]: === Iteration 8 === [mainErr8REQUIRES_VIOLATION, mainErr9REQUIRES_VIOLATION, mainErr5REQUIRES_VIOLATION, mainErr6REQUIRES_VIOLATION, mainErr7REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr12ENSURES_VIOLATIONMEMORY_LEAK, mainErr4REQUIRES_VIOLATION, mainErr10REQUIRES_VIOLATION, mainErr11REQUIRES_VIOLATION, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION]=== [2019-11-19 22:21:55,384 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-19 22:21:55,384 INFO L82 PathProgramCache]: Analyzing trace with hash 2104505498, now seen corresponding path program 1 times [2019-11-19 22:21:55,384 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-19 22:21:55,385 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [1046086994] [2019-11-19 22:21:55,385 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_4144f571-3244-44b5-8ab4-49b82118e29d/bin/uautomizer/cvc4 Starting monitored process 9 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-19 22:21:55,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-19 22:21:55,526 INFO L255 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 11 conjunts are in the unsatisfiable core [2019-11-19 22:21:55,527 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-19 22:21:55,557 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2019-11-19 22:21:55,558 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-19 22:21:55,571 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-19 22:21:55,571 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-19 22:21:55,572 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:19 [2019-11-19 22:21:55,719 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-19 22:21:55,719 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-19 22:21:56,305 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-19 22:21:56,305 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1046086994] [2019-11-19 22:21:56,306 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-19 22:21:56,306 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 12 [2019-11-19 22:21:56,306 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1585693350] [2019-11-19 22:21:56,306 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-11-19 22:21:56,306 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-19 22:21:56,307 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-11-19 22:21:56,307 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=109, Unknown=0, NotChecked=0, Total=156 [2019-11-19 22:21:56,307 INFO L87 Difference]: Start difference. First operand 45 states and 49 transitions. Second operand 13 states. [2019-11-19 22:21:56,847 WARN L191 SmtUtils]: Spent 210.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 35 [2019-11-19 22:21:57,049 WARN L191 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 31 [2019-11-19 22:21:57,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-19 22:21:57,479 INFO L93 Difference]: Finished difference Result 67 states and 74 transitions. [2019-11-19 22:21:57,480 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-11-19 22:21:57,480 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 15 [2019-11-19 22:21:57,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-19 22:21:57,481 INFO L225 Difference]: With dead ends: 67 [2019-11-19 22:21:57,482 INFO L226 Difference]: Without dead ends: 67 [2019-11-19 22:21:57,482 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=121, Invalid=221, Unknown=0, NotChecked=0, Total=342 [2019-11-19 22:21:57,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2019-11-19 22:21:57,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 47. [2019-11-19 22:21:57,486 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2019-11-19 22:21:57,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 52 transitions. [2019-11-19 22:21:57,487 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 52 transitions. Word has length 15 [2019-11-19 22:21:57,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-19 22:21:57,488 INFO L462 AbstractCegarLoop]: Abstraction has 47 states and 52 transitions. [2019-11-19 22:21:57,488 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-11-19 22:21:57,488 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 52 transitions. [2019-11-19 22:21:57,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-11-19 22:21:57,489 INFO L402 BasicCegarLoop]: Found error trace [2019-11-19 22:21:57,489 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-19 22:21:57,691 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-19 22:21:57,691 INFO L410 AbstractCegarLoop]: === Iteration 9 === [mainErr8REQUIRES_VIOLATION, mainErr9REQUIRES_VIOLATION, mainErr5REQUIRES_VIOLATION, mainErr6REQUIRES_VIOLATION, mainErr7REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr12ENSURES_VIOLATIONMEMORY_LEAK, mainErr4REQUIRES_VIOLATION, mainErr10REQUIRES_VIOLATION, mainErr11REQUIRES_VIOLATION, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION]=== [2019-11-19 22:21:57,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-19 22:21:57,692 INFO L82 PathProgramCache]: Analyzing trace with hash 1256311947, now seen corresponding path program 1 times [2019-11-19 22:21:57,692 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-19 22:21:57,693 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [738144606] [2019-11-19 22:21:57,693 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_4144f571-3244-44b5-8ab4-49b82118e29d/bin/uautomizer/cvc4 Starting monitored process 10 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-19 22:21:57,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-19 22:21:57,880 INFO L255 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 7 conjunts are in the unsatisfiable core [2019-11-19 22:21:57,882 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-19 22:21:57,887 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-11-19 22:21:57,887 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-19 22:21:57,889 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-19 22:21:57,889 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-19 22:21:57,889 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:6, output treesize:5 [2019-11-19 22:21:57,923 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-19 22:21:57,923 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-19 22:22:01,977 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-19 22:22:01,978 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [738144606] [2019-11-19 22:22:01,978 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-19 22:22:01,978 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 7 [2019-11-19 22:22:01,978 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1400078051] [2019-11-19 22:22:01,979 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-11-19 22:22:01,979 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-19 22:22:01,979 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-11-19 22:22:01,979 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=36, Unknown=2, NotChecked=0, Total=56 [2019-11-19 22:22:01,979 INFO L87 Difference]: Start difference. First operand 47 states and 52 transitions. Second operand 8 states. [2019-11-19 22:22:02,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-19 22:22:02,080 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2019-11-19 22:22:02,081 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-19 22:22:02,081 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 19 [2019-11-19 22:22:02,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-19 22:22:02,083 INFO L225 Difference]: With dead ends: 46 [2019-11-19 22:22:02,084 INFO L226 Difference]: Without dead ends: 44 [2019-11-19 22:22:02,084 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=23, Invalid=47, Unknown=2, NotChecked=0, Total=72 [2019-11-19 22:22:02,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2019-11-19 22:22:02,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2019-11-19 22:22:02,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2019-11-19 22:22:02,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 49 transitions. [2019-11-19 22:22:02,089 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 49 transitions. Word has length 19 [2019-11-19 22:22:02,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-19 22:22:02,089 INFO L462 AbstractCegarLoop]: Abstraction has 44 states and 49 transitions. [2019-11-19 22:22:02,089 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-11-19 22:22:02,089 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 49 transitions. [2019-11-19 22:22:02,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-11-19 22:22:02,090 INFO L402 BasicCegarLoop]: Found error trace [2019-11-19 22:22:02,090 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-19 22:22:02,291 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-19 22:22:02,291 INFO L410 AbstractCegarLoop]: === Iteration 10 === [mainErr8REQUIRES_VIOLATION, mainErr9REQUIRES_VIOLATION, mainErr5REQUIRES_VIOLATION, mainErr6REQUIRES_VIOLATION, mainErr7REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr12ENSURES_VIOLATIONMEMORY_LEAK, mainErr4REQUIRES_VIOLATION, mainErr10REQUIRES_VIOLATION, mainErr11REQUIRES_VIOLATION, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION]=== [2019-11-19 22:22:02,291 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-19 22:22:02,291 INFO L82 PathProgramCache]: Analyzing trace with hash 489147449, now seen corresponding path program 1 times [2019-11-19 22:22:02,292 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-19 22:22:02,292 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [2084156915] [2019-11-19 22:22:02,292 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_4144f571-3244-44b5-8ab4-49b82118e29d/bin/uautomizer/cvc4 Starting monitored process 11 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-19 22:22:02,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-19 22:22:02,476 INFO L255 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 10 conjunts are in the unsatisfiable core [2019-11-19 22:22:02,478 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-19 22:22:02,519 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 15 treesize of output 11 [2019-11-19 22:22:02,519 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-19 22:22:02,540 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-19 22:22:02,541 INFO L496 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-19 22:22:02,541 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:28, output treesize:13 [2019-11-19 22:22:02,578 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2019-11-19 22:22:02,579 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-19 22:22:02,585 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-19 22:22:02,586 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-19 22:22:02,586 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:15, output treesize:3 [2019-11-19 22:22:02,601 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-19 22:22:02,601 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-19 22:22:02,883 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-19 22:22:02,884 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction has thrown an exception: java.lang.AssertionError: incompatible size at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.arrays.ArrayIndexBasedCostEstimation.analyzeCosts(ArrayIndexBasedCostEstimation.java:211) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.arrays.ArrayIndexBasedCostEstimation.computeCostEstimation(ArrayIndexBasedCostEstimation.java:152) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.arrays.ArrayIndexBasedCostEstimation.(ArrayIndexBasedCostEstimation.java:64) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.ElimStorePlain.computeCostEstimation(ElimStorePlain.java:519) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.ElimStorePlain.doElimAllRec(ElimStorePlain.java:390) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.ElimStorePlain.startRecursiveElimination(ElimStorePlain.java:216) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.PartialQuantifierElimination.elim(PartialQuantifierElimination.java:306) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.PartialQuantifierElimination.tryToEliminate(PartialQuantifierElimination.java:102) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.predicates.IterativePredicateTransformer$QuantifierEliminationPostprocessor.postprocess(IterativePredicateTransformer.java:246) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.predicates.IterativePredicateTransformer.applyPostprocessors(IterativePredicateTransformer.java:440) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.predicates.IterativePredicateTransformer.computeBackwardSequence(IterativePredicateTransformer.java:419) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.predicates.IterativePredicateTransformer.computeWeakestPreconditionSequence(IterativePredicateTransformer.java:291) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.singletracecheck.TraceCheckSpWp.computeInterpolantsUsingUnsatCore(TraceCheckSpWp.java:334) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.singletracecheck.TraceCheckSpWp.computeInterpolants(TraceCheckSpWp.java:177) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.singletracecheck.TraceCheckSpWp.(TraceCheckSpWp.java:162) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSpWp.construct(IpTcStrategyModuleSpWp.java:108) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSpWp.construct(IpTcStrategyModuleSpWp.java:1) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.isCorrect(IpTcStrategyModuleBase.java:57) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.checkFeasibility(AutomatonFreeRefinementEngine.java:242) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:166) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:75) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:463) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:419) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:368) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterate(TraceAbstractionStarter.java:333) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:171) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:123) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:120) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:316) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55) [2019-11-19 22:22:02,887 INFO L168 Benchmark]: Toolchain (without parser) took 14472.08 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 184.5 MB). Free memory was 939.3 MB in the beginning and 1.1 GB in the end (delta: -173.3 MB). Peak memory consumption was 11.2 MB. Max. memory is 11.5 GB. [2019-11-19 22:22:02,887 INFO L168 Benchmark]: CDTParser took 0.19 ms. Allocated memory is still 1.0 GB. Free memory is still 962.2 MB. There was no memory consumed. Max. memory is 11.5 GB. [2019-11-19 22:22:02,888 INFO L168 Benchmark]: CACSL2BoogieTranslator took 583.33 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 151.5 MB). Free memory was 939.3 MB in the beginning and 1.1 GB in the end (delta: -194.6 MB). Peak memory consumption was 18.2 MB. Max. memory is 11.5 GB. [2019-11-19 22:22:02,889 INFO L168 Benchmark]: Boogie Preprocessor took 69.18 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 5.4 MB). Peak memory consumption was 5.4 MB. Max. memory is 11.5 GB. [2019-11-19 22:22:02,889 INFO L168 Benchmark]: RCFGBuilder took 803.86 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 49.3 MB). Peak memory consumption was 49.3 MB. Max. memory is 11.5 GB. [2019-11-19 22:22:02,890 INFO L168 Benchmark]: TraceAbstraction took 13011.98 ms. Allocated memory was 1.2 GB in the beginning and 1.2 GB in the end (delta: 33.0 MB). Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: -33.3 MB). There was no memory consumed. Max. memory is 11.5 GB. [2019-11-19 22:22:02,895 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.19 ms. Allocated memory is still 1.0 GB. Free memory is still 962.2 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 583.33 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 151.5 MB). Free memory was 939.3 MB in the beginning and 1.1 GB in the end (delta: -194.6 MB). Peak memory consumption was 18.2 MB. Max. memory is 11.5 GB. * Boogie Preprocessor took 69.18 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 5.4 MB). Peak memory consumption was 5.4 MB. Max. memory is 11.5 GB. * RCFGBuilder took 803.86 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 49.3 MB). Peak memory consumption was 49.3 MB. Max. memory is 11.5 GB. * TraceAbstraction took 13011.98 ms. Allocated memory was 1.2 GB in the beginning and 1.2 GB in the end (delta: 33.0 MB). Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: -33.3 MB). There was no memory consumed. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - ExceptionOrErrorResult: AssertionError: incompatible size de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: AssertionError: incompatible size: de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.arrays.ArrayIndexBasedCostEstimation.analyzeCosts(ArrayIndexBasedCostEstimation.java:211) RESULT: Ultimate could not prove your program: Toolchain returned no result. Received shutdown request...