./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/openbsd_cstrnlen-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_5ca48234-9c09-44bd-ae15-9e144e957967/bin/uautomizer/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/run_dir_5ca48234-9c09-44bd-ae15-9e144e957967/bin/uautomizer/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_5ca48234-9c09-44bd-ae15-9e144e957967/bin/uautomizer/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_5ca48234-9c09-44bd-ae15-9e144e957967/bin/uautomizer/config/AutomizerMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/openbsd_cstrnlen-alloca-1.i -s /tmp/vcloud-vcloud-master/worker/run_dir_5ca48234-9c09-44bd-ae15-9e144e957967/bin/uautomizer/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_5ca48234-9c09-44bd-ae15-9e144e957967/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 7ac509d7b3f1ef173e01ced3ce9249a58ee1c04d ................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- Skipped default analysis because property is memsafety ### Bit-precise run ### This is Ultimate 0.1.24-678e011 [2019-11-19 22:15:59,174 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-19 22:15:59,176 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-19 22:15:59,190 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-19 22:15:59,190 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-19 22:15:59,192 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-19 22:15:59,193 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-19 22:15:59,203 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-19 22:15:59,207 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-19 22:15:59,211 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-19 22:15:59,212 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-19 22:15:59,213 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-19 22:15:59,213 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-19 22:15:59,215 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-19 22:15:59,217 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-19 22:15:59,218 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-19 22:15:59,219 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-19 22:15:59,220 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-19 22:15:59,222 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-19 22:15:59,225 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-19 22:15:59,229 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-19 22:15:59,231 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-19 22:15:59,234 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-19 22:15:59,235 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-19 22:15:59,239 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-11-19 22:15:59,239 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-11-19 22:15:59,239 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-11-19 22:15:59,241 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-11-19 22:15:59,241 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-11-19 22:15:59,242 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-11-19 22:15:59,242 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-11-19 22:15:59,243 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-11-19 22:15:59,244 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-11-19 22:15:59,244 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-11-19 22:15:59,245 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-11-19 22:15:59,245 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-11-19 22:15:59,246 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-11-19 22:15:59,246 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-11-19 22:15:59,246 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-19 22:15:59,247 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-19 22:15:59,249 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-19 22:15:59,249 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_5ca48234-9c09-44bd-ae15-9e144e957967/bin/uautomizer/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Bitvector.epf [2019-11-19 22:15:59,273 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-19 22:15:59,282 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-19 22:15:59,284 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-19 22:15:59,284 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-19 22:15:59,284 INFO L138 SettingsManager]: * Use SBE=true [2019-11-19 22:15:59,284 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-19 22:15:59,285 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-19 22:15:59,285 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2019-11-19 22:15:59,285 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-19 22:15:59,285 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-19 22:15:59,285 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-19 22:15:59,286 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2019-11-19 22:15:59,286 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2019-11-19 22:15:59,286 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2019-11-19 22:15:59,286 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-19 22:15:59,287 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2019-11-19 22:15:59,287 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2019-11-19 22:15:59,287 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-19 22:15:59,287 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-19 22:15:59,287 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-19 22:15:59,288 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-19 22:15:59,288 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-19 22:15:59,288 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-19 22:15:59,288 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-19 22:15:59,289 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-19 22:15:59,289 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-19 22:15:59,289 INFO L138 SettingsManager]: * Trace refinement strategy=WOLF [2019-11-19 22:15:59,289 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --rewrite-divk --print-success --lang smt [2019-11-19 22:15:59,289 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-19 22:15:59,290 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_5ca48234-9c09-44bd-ae15-9e144e957967/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 -> 7ac509d7b3f1ef173e01ced3ce9249a58ee1c04d [2019-11-19 22:15:59,460 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-19 22:15:59,473 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-19 22:15:59,479 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-19 22:15:59,480 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-19 22:15:59,481 INFO L275 PluginConnector]: CDTParser initialized [2019-11-19 22:15:59,482 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_5ca48234-9c09-44bd-ae15-9e144e957967/bin/uautomizer/../../sv-benchmarks/c/array-memsafety/openbsd_cstrnlen-alloca-1.i [2019-11-19 22:15:59,538 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_5ca48234-9c09-44bd-ae15-9e144e957967/bin/uautomizer/data/e5d2580c8/b2ab0d1cdb144e40b10ab2f028f744a9/FLAGb7532f1a4 [2019-11-19 22:15:59,967 INFO L306 CDTParser]: Found 1 translation units. [2019-11-19 22:15:59,968 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_5ca48234-9c09-44bd-ae15-9e144e957967/sv-benchmarks/c/array-memsafety/openbsd_cstrnlen-alloca-1.i [2019-11-19 22:15:59,979 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_5ca48234-9c09-44bd-ae15-9e144e957967/bin/uautomizer/data/e5d2580c8/b2ab0d1cdb144e40b10ab2f028f744a9/FLAGb7532f1a4 [2019-11-19 22:15:59,991 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_5ca48234-9c09-44bd-ae15-9e144e957967/bin/uautomizer/data/e5d2580c8/b2ab0d1cdb144e40b10ab2f028f744a9 [2019-11-19 22:15:59,993 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-19 22:15:59,994 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2019-11-19 22:15:59,995 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-19 22:15:59,995 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-19 22:15:59,998 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-19 22:15:59,999 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 10:15:59" (1/1) ... [2019-11-19 22:16:00,001 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@8314447 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 10:16:00, skipping insertion in model container [2019-11-19 22:16:00,002 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 10:15:59" (1/1) ... [2019-11-19 22:16:00,008 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-19 22:16:00,041 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-19 22:16:00,443 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-19 22:16:00,457 INFO L188 MainTranslator]: Completed pre-run [2019-11-19 22:16:00,514 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-19 22:16:00,570 INFO L192 MainTranslator]: Completed translation [2019-11-19 22:16:00,571 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 10:16:00 WrapperNode [2019-11-19 22:16:00,571 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-19 22:16:00,572 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-19 22:16:00,572 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-19 22:16:00,572 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-19 22:16:00,584 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 10:16:00" (1/1) ... [2019-11-19 22:16:00,585 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 10:16:00" (1/1) ... [2019-11-19 22:16:00,616 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 10:16:00" (1/1) ... [2019-11-19 22:16:00,617 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 10:16:00" (1/1) ... [2019-11-19 22:16:00,639 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 10:16:00" (1/1) ... [2019-11-19 22:16:00,643 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 10:16:00" (1/1) ... [2019-11-19 22:16:00,646 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 10:16:00" (1/1) ... [2019-11-19 22:16:00,652 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-19 22:16:00,652 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-19 22:16:00,653 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-19 22:16:00,653 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-19 22:16:00,654 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 10:16:00" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_5ca48234-9c09-44bd-ae15-9e144e957967/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 22:16:00,711 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-19 22:16:00,711 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-19 22:16:00,711 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_32 [2019-11-19 22:16:00,711 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_64 [2019-11-19 22:16:00,712 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint16_identity [2019-11-19 22:16:00,712 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint32_identity [2019-11-19 22:16:00,712 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint64_identity [2019-11-19 22:16:00,712 INFO L138 BoogieDeclarations]: Found implementation of procedure cstrnlen [2019-11-19 22:16:00,712 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-19 22:16:00,713 INFO L130 BoogieDeclarations]: Found specification of procedure __ctype_get_mb_cur_max [2019-11-19 22:16:00,713 INFO L130 BoogieDeclarations]: Found specification of procedure atof [2019-11-19 22:16:00,713 INFO L130 BoogieDeclarations]: Found specification of procedure atoi [2019-11-19 22:16:00,713 INFO L130 BoogieDeclarations]: Found specification of procedure atol [2019-11-19 22:16:00,713 INFO L130 BoogieDeclarations]: Found specification of procedure atoll [2019-11-19 22:16:00,714 INFO L130 BoogieDeclarations]: Found specification of procedure strtod [2019-11-19 22:16:00,714 INFO L130 BoogieDeclarations]: Found specification of procedure strtof [2019-11-19 22:16:00,714 INFO L130 BoogieDeclarations]: Found specification of procedure strtold [2019-11-19 22:16:00,714 INFO L130 BoogieDeclarations]: Found specification of procedure strtol [2019-11-19 22:16:00,714 INFO L130 BoogieDeclarations]: Found specification of procedure strtoul [2019-11-19 22:16:00,715 INFO L130 BoogieDeclarations]: Found specification of procedure strtoq [2019-11-19 22:16:00,715 INFO L130 BoogieDeclarations]: Found specification of procedure strtouq [2019-11-19 22:16:00,715 INFO L130 BoogieDeclarations]: Found specification of procedure strtoll [2019-11-19 22:16:00,715 INFO L130 BoogieDeclarations]: Found specification of procedure strtoull [2019-11-19 22:16:00,715 INFO L130 BoogieDeclarations]: Found specification of procedure l64a [2019-11-19 22:16:00,716 INFO L130 BoogieDeclarations]: Found specification of procedure a64l [2019-11-19 22:16:00,716 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_32 [2019-11-19 22:16:00,716 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_64 [2019-11-19 22:16:00,716 INFO L130 BoogieDeclarations]: Found specification of procedure __uint16_identity [2019-11-19 22:16:00,716 INFO L130 BoogieDeclarations]: Found specification of procedure __uint32_identity [2019-11-19 22:16:00,716 INFO L130 BoogieDeclarations]: Found specification of procedure __uint64_identity [2019-11-19 22:16:00,717 INFO L130 BoogieDeclarations]: Found specification of procedure select [2019-11-19 22:16:00,717 INFO L130 BoogieDeclarations]: Found specification of procedure pselect [2019-11-19 22:16:00,717 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_major [2019-11-19 22:16:00,717 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_minor [2019-11-19 22:16:00,717 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_makedev [2019-11-19 22:16:00,717 INFO L130 BoogieDeclarations]: Found specification of procedure random [2019-11-19 22:16:00,718 INFO L130 BoogieDeclarations]: Found specification of procedure srandom [2019-11-19 22:16:00,718 INFO L130 BoogieDeclarations]: Found specification of procedure initstate [2019-11-19 22:16:00,718 INFO L130 BoogieDeclarations]: Found specification of procedure setstate [2019-11-19 22:16:00,718 INFO L130 BoogieDeclarations]: Found specification of procedure random_r [2019-11-19 22:16:00,718 INFO L130 BoogieDeclarations]: Found specification of procedure srandom_r [2019-11-19 22:16:00,718 INFO L130 BoogieDeclarations]: Found specification of procedure initstate_r [2019-11-19 22:16:00,719 INFO L130 BoogieDeclarations]: Found specification of procedure setstate_r [2019-11-19 22:16:00,719 INFO L130 BoogieDeclarations]: Found specification of procedure rand [2019-11-19 22:16:00,719 INFO L130 BoogieDeclarations]: Found specification of procedure srand [2019-11-19 22:16:00,719 INFO L130 BoogieDeclarations]: Found specification of procedure rand_r [2019-11-19 22:16:00,719 INFO L130 BoogieDeclarations]: Found specification of procedure drand48 [2019-11-19 22:16:00,719 INFO L130 BoogieDeclarations]: Found specification of procedure erand48 [2019-11-19 22:16:00,720 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48 [2019-11-19 22:16:00,720 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48 [2019-11-19 22:16:00,720 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48 [2019-11-19 22:16:00,720 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48 [2019-11-19 22:16:00,720 INFO L130 BoogieDeclarations]: Found specification of procedure srand48 [2019-11-19 22:16:00,720 INFO L130 BoogieDeclarations]: Found specification of procedure seed48 [2019-11-19 22:16:00,721 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48 [2019-11-19 22:16:00,721 INFO L130 BoogieDeclarations]: Found specification of procedure drand48_r [2019-11-19 22:16:00,721 INFO L130 BoogieDeclarations]: Found specification of procedure erand48_r [2019-11-19 22:16:00,721 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48_r [2019-11-19 22:16:00,721 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48_r [2019-11-19 22:16:00,721 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48_r [2019-11-19 22:16:00,722 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48_r [2019-11-19 22:16:00,722 INFO L130 BoogieDeclarations]: Found specification of procedure srand48_r [2019-11-19 22:16:00,722 INFO L130 BoogieDeclarations]: Found specification of procedure seed48_r [2019-11-19 22:16:00,722 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48_r [2019-11-19 22:16:00,722 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2019-11-19 22:16:00,722 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2019-11-19 22:16:00,723 INFO L130 BoogieDeclarations]: Found specification of procedure realloc [2019-11-19 22:16:00,723 INFO L130 BoogieDeclarations]: Found specification of procedure free [2019-11-19 22:16:00,723 INFO L130 BoogieDeclarations]: Found specification of procedure alloca [2019-11-19 22:16:00,723 INFO L130 BoogieDeclarations]: Found specification of procedure valloc [2019-11-19 22:16:00,723 INFO L130 BoogieDeclarations]: Found specification of procedure posix_memalign [2019-11-19 22:16:00,723 INFO L130 BoogieDeclarations]: Found specification of procedure aligned_alloc [2019-11-19 22:16:00,724 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2019-11-19 22:16:00,724 INFO L130 BoogieDeclarations]: Found specification of procedure atexit [2019-11-19 22:16:00,724 INFO L130 BoogieDeclarations]: Found specification of procedure at_quick_exit [2019-11-19 22:16:00,724 INFO L130 BoogieDeclarations]: Found specification of procedure on_exit [2019-11-19 22:16:00,724 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2019-11-19 22:16:00,724 INFO L130 BoogieDeclarations]: Found specification of procedure quick_exit [2019-11-19 22:16:00,725 INFO L130 BoogieDeclarations]: Found specification of procedure _Exit [2019-11-19 22:16:00,725 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2019-11-19 22:16:00,725 INFO L130 BoogieDeclarations]: Found specification of procedure putenv [2019-11-19 22:16:00,725 INFO L130 BoogieDeclarations]: Found specification of procedure setenv [2019-11-19 22:16:00,725 INFO L130 BoogieDeclarations]: Found specification of procedure unsetenv [2019-11-19 22:16:00,726 INFO L130 BoogieDeclarations]: Found specification of procedure clearenv [2019-11-19 22:16:00,726 INFO L130 BoogieDeclarations]: Found specification of procedure mktemp [2019-11-19 22:16:00,726 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemp [2019-11-19 22:16:00,726 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemps [2019-11-19 22:16:00,726 INFO L130 BoogieDeclarations]: Found specification of procedure mkdtemp [2019-11-19 22:16:00,726 INFO L130 BoogieDeclarations]: Found specification of procedure system [2019-11-19 22:16:00,727 INFO L130 BoogieDeclarations]: Found specification of procedure realpath [2019-11-19 22:16:00,727 INFO L130 BoogieDeclarations]: Found specification of procedure bsearch [2019-11-19 22:16:00,727 INFO L130 BoogieDeclarations]: Found specification of procedure qsort [2019-11-19 22:16:00,727 INFO L130 BoogieDeclarations]: Found specification of procedure abs [2019-11-19 22:16:00,727 INFO L130 BoogieDeclarations]: Found specification of procedure labs [2019-11-19 22:16:00,728 INFO L130 BoogieDeclarations]: Found specification of procedure llabs [2019-11-19 22:16:00,728 INFO L130 BoogieDeclarations]: Found specification of procedure div [2019-11-19 22:16:00,728 INFO L130 BoogieDeclarations]: Found specification of procedure ldiv [2019-11-19 22:16:00,728 INFO L130 BoogieDeclarations]: Found specification of procedure lldiv [2019-11-19 22:16:00,728 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt [2019-11-19 22:16:00,728 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt [2019-11-19 22:16:00,729 INFO L130 BoogieDeclarations]: Found specification of procedure gcvt [2019-11-19 22:16:00,729 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt [2019-11-19 22:16:00,729 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt [2019-11-19 22:16:00,729 INFO L130 BoogieDeclarations]: Found specification of procedure qgcvt [2019-11-19 22:16:00,729 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt_r [2019-11-19 22:16:00,729 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt_r [2019-11-19 22:16:00,730 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt_r [2019-11-19 22:16:00,730 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt_r [2019-11-19 22:16:00,730 INFO L130 BoogieDeclarations]: Found specification of procedure mblen [2019-11-19 22:16:00,730 INFO L130 BoogieDeclarations]: Found specification of procedure mbtowc [2019-11-19 22:16:00,730 INFO L130 BoogieDeclarations]: Found specification of procedure wctomb [2019-11-19 22:16:00,730 INFO L130 BoogieDeclarations]: Found specification of procedure mbstowcs [2019-11-19 22:16:00,731 INFO L130 BoogieDeclarations]: Found specification of procedure wcstombs [2019-11-19 22:16:00,731 INFO L130 BoogieDeclarations]: Found specification of procedure rpmatch [2019-11-19 22:16:00,731 INFO L130 BoogieDeclarations]: Found specification of procedure getsubopt [2019-11-19 22:16:00,731 INFO L130 BoogieDeclarations]: Found specification of procedure getloadavg [2019-11-19 22:16:00,731 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-11-19 22:16:00,731 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2019-11-19 22:16:00,732 INFO L130 BoogieDeclarations]: Found specification of procedure cstrnlen [2019-11-19 22:16:00,732 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE1 [2019-11-19 22:16:00,732 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-19 22:16:00,732 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-19 22:16:00,732 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE1 [2019-11-19 22:16:00,732 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-19 22:16:00,733 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-19 22:16:00,733 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-19 22:16:01,249 INFO L280 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-19 22:16:01,249 INFO L285 CfgBuilder]: Removed 2 assume(true) statements. [2019-11-19 22:16:01,250 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 10:16:01 BoogieIcfgContainer [2019-11-19 22:16:01,250 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-19 22:16:01,251 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-19 22:16:01,251 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-19 22:16:01,254 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-19 22:16:01,254 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 10:15:59" (1/3) ... [2019-11-19 22:16:01,255 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6a8d318b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 10:16:01, skipping insertion in model container [2019-11-19 22:16:01,255 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 10:16:00" (2/3) ... [2019-11-19 22:16:01,255 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6a8d318b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 10:16:01, skipping insertion in model container [2019-11-19 22:16:01,255 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 10:16:01" (3/3) ... [2019-11-19 22:16:01,256 INFO L109 eAbstractionObserver]: Analyzing ICFG openbsd_cstrnlen-alloca-1.i [2019-11-19 22:16:01,265 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-19 22:16:01,272 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 7 error locations. [2019-11-19 22:16:01,282 INFO L249 AbstractCegarLoop]: Starting to check reachability of 7 error locations. [2019-11-19 22:16:01,298 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-19 22:16:01,299 INFO L374 AbstractCegarLoop]: Hoare is false [2019-11-19 22:16:01,299 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-19 22:16:01,299 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-19 22:16:01,299 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-19 22:16:01,299 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-19 22:16:01,299 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-19 22:16:01,299 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-19 22:16:01,312 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states. [2019-11-19 22:16:01,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2019-11-19 22:16:01,321 INFO L402 BasicCegarLoop]: Found error trace [2019-11-19 22:16:01,321 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-19 22:16:01,322 INFO L410 AbstractCegarLoop]: === Iteration 1 === [cstrnlenErr0REQUIRES_VIOLATION, cstrnlenErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION]=== [2019-11-19 22:16:01,327 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-19 22:16:01,327 INFO L82 PathProgramCache]: Analyzing trace with hash 787746653, now seen corresponding path program 1 times [2019-11-19 22:16:01,337 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-19 22:16:01,337 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [1898581925] [2019-11-19 22:16:01,338 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_5ca48234-9c09-44bd-ae15-9e144e957967/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 22:16:01,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-19 22:16:01,533 INFO L255 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 1 conjunts are in the unsatisfiable core [2019-11-19 22:16:01,540 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-19 22:16:01,559 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 22:16:01,560 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-19 22:16:01,581 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 22:16:01,582 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1898581925] [2019-11-19 22:16:01,583 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-19 22:16:01,583 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2019-11-19 22:16:01,584 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [846546147] [2019-11-19 22:16:01,588 INFO L442 AbstractCegarLoop]: Interpolant automaton has 2 states [2019-11-19 22:16:01,588 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-19 22:16:01,603 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2019-11-19 22:16:01,604 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-11-19 22:16:01,606 INFO L87 Difference]: Start difference. First operand 37 states. Second operand 2 states. [2019-11-19 22:16:01,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-19 22:16:01,628 INFO L93 Difference]: Finished difference Result 37 states and 41 transitions. [2019-11-19 22:16:01,628 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-11-19 22:16:01,630 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 11 [2019-11-19 22:16:01,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-19 22:16:01,643 INFO L225 Difference]: With dead ends: 37 [2019-11-19 22:16:01,643 INFO L226 Difference]: Without dead ends: 34 [2019-11-19 22:16:01,646 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-11-19 22:16:01,662 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2019-11-19 22:16:01,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2019-11-19 22:16:01,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2019-11-19 22:16:01,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 38 transitions. [2019-11-19 22:16:01,682 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 38 transitions. Word has length 11 [2019-11-19 22:16:01,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-19 22:16:01,682 INFO L462 AbstractCegarLoop]: Abstraction has 34 states and 38 transitions. [2019-11-19 22:16:01,682 INFO L463 AbstractCegarLoop]: Interpolant automaton has 2 states. [2019-11-19 22:16:01,683 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 38 transitions. [2019-11-19 22:16:01,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2019-11-19 22:16:01,683 INFO L402 BasicCegarLoop]: Found error trace [2019-11-19 22:16:01,683 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-19 22:16:01,886 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-19 22:16:01,886 INFO L410 AbstractCegarLoop]: === Iteration 2 === [cstrnlenErr0REQUIRES_VIOLATION, cstrnlenErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION]=== [2019-11-19 22:16:01,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-19 22:16:01,887 INFO L82 PathProgramCache]: Analyzing trace with hash 787746343, now seen corresponding path program 1 times [2019-11-19 22:16:01,887 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-19 22:16:01,887 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [1807173494] [2019-11-19 22:16:01,887 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_5ca48234-9c09-44bd-ae15-9e144e957967/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 22:16:02,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-19 22:16:02,061 INFO L255 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-19 22:16:02,062 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-19 22:16:02,105 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 22:16:02,106 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-19 22:16:02,109 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-19 22:16:02,110 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-19 22:16:02,110 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:6, output treesize:5 [2019-11-19 22:16:02,119 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 22:16:02,119 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-19 22:16:02,131 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 22:16:02,132 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1807173494] [2019-11-19 22:16:02,132 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-19 22:16:02,132 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2019-11-19 22:16:02,133 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [103276853] [2019-11-19 22:16:02,134 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-19 22:16:02,134 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-19 22:16:02,134 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-19 22:16:02,135 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-19 22:16:02,135 INFO L87 Difference]: Start difference. First operand 34 states and 38 transitions. Second operand 3 states. [2019-11-19 22:16:02,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-19 22:16:02,212 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2019-11-19 22:16:02,212 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-19 22:16:02,212 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2019-11-19 22:16:02,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-19 22:16:02,213 INFO L225 Difference]: With dead ends: 32 [2019-11-19 22:16:02,213 INFO L226 Difference]: Without dead ends: 32 [2019-11-19 22:16:02,214 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 22:16:02,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2019-11-19 22:16:02,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2019-11-19 22:16:02,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2019-11-19 22:16:02,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 36 transitions. [2019-11-19 22:16:02,219 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 36 transitions. Word has length 11 [2019-11-19 22:16:02,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-19 22:16:02,219 INFO L462 AbstractCegarLoop]: Abstraction has 32 states and 36 transitions. [2019-11-19 22:16:02,219 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-19 22:16:02,219 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 36 transitions. [2019-11-19 22:16:02,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2019-11-19 22:16:02,220 INFO L402 BasicCegarLoop]: Found error trace [2019-11-19 22:16:02,220 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-19 22:16:02,420 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-19 22:16:02,421 INFO L410 AbstractCegarLoop]: === Iteration 3 === [cstrnlenErr0REQUIRES_VIOLATION, cstrnlenErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION]=== [2019-11-19 22:16:02,421 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-19 22:16:02,421 INFO L82 PathProgramCache]: Analyzing trace with hash 787746344, now seen corresponding path program 1 times [2019-11-19 22:16:02,421 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-19 22:16:02,422 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [1947599841] [2019-11-19 22:16:02,422 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_5ca48234-9c09-44bd-ae15-9e144e957967/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 22:16:02,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-19 22:16:02,610 INFO L255 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-19 22:16:02,612 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-19 22:16:02,629 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 22:16:02,630 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-19 22:16:02,642 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-19 22:16:02,642 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-19 22:16:02,642 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:15, output treesize:14 [2019-11-19 22:16:02,662 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 22:16:02,662 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-19 22:16:02,807 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 22:16:02,808 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1947599841] [2019-11-19 22:16:02,808 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-19 22:16:02,808 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 5 [2019-11-19 22:16:02,808 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1517017531] [2019-11-19 22:16:02,809 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-19 22:16:02,809 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-19 22:16:02,809 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-19 22:16:02,809 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2019-11-19 22:16:02,810 INFO L87 Difference]: Start difference. First operand 32 states and 36 transitions. Second operand 6 states. [2019-11-19 22:16:03,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-19 22:16:03,097 INFO L93 Difference]: Finished difference Result 43 states and 49 transitions. [2019-11-19 22:16:03,100 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-19 22:16:03,100 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 11 [2019-11-19 22:16:03,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-19 22:16:03,102 INFO L225 Difference]: With dead ends: 43 [2019-11-19 22:16:03,103 INFO L226 Difference]: Without dead ends: 43 [2019-11-19 22:16:03,103 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2019-11-19 22:16:03,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2019-11-19 22:16:03,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2019-11-19 22:16:03,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2019-11-19 22:16:03,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2019-11-19 22:16:03,121 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 11 [2019-11-19 22:16:03,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-19 22:16:03,122 INFO L462 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2019-11-19 22:16:03,122 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-19 22:16:03,123 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2019-11-19 22:16:03,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2019-11-19 22:16:03,123 INFO L402 BasicCegarLoop]: Found error trace [2019-11-19 22:16:03,124 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-19 22:16:03,325 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-19 22:16:03,326 INFO L410 AbstractCegarLoop]: === Iteration 4 === [cstrnlenErr0REQUIRES_VIOLATION, cstrnlenErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION]=== [2019-11-19 22:16:03,326 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-19 22:16:03,326 INFO L82 PathProgramCache]: Analyzing trace with hash 787746397, now seen corresponding path program 1 times [2019-11-19 22:16:03,326 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-19 22:16:03,327 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [695680330] [2019-11-19 22:16:03,327 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_5ca48234-9c09-44bd-ae15-9e144e957967/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 22:16:03,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-19 22:16:03,493 INFO L255 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-19 22:16:03,494 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-19 22:16:03,520 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 22:16:03,520 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-19 22:16:03,552 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 22:16:03,552 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [695680330] [2019-11-19 22:16:03,552 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-19 22:16:03,552 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2019-11-19 22:16:03,552 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [45231634] [2019-11-19 22:16:03,553 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-19 22:16:03,553 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-19 22:16:03,553 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-19 22:16:03,553 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2019-11-19 22:16:03,553 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 6 states. [2019-11-19 22:16:03,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-19 22:16:03,628 INFO L93 Difference]: Finished difference Result 39 states and 44 transitions. [2019-11-19 22:16:03,630 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-19 22:16:03,631 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 11 [2019-11-19 22:16:03,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-19 22:16:03,632 INFO L225 Difference]: With dead ends: 39 [2019-11-19 22:16:03,632 INFO L226 Difference]: Without dead ends: 39 [2019-11-19 22:16:03,632 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2019-11-19 22:16:03,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2019-11-19 22:16:03,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 34. [2019-11-19 22:16:03,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2019-11-19 22:16:03,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 39 transitions. [2019-11-19 22:16:03,640 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 39 transitions. Word has length 11 [2019-11-19 22:16:03,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-19 22:16:03,640 INFO L462 AbstractCegarLoop]: Abstraction has 34 states and 39 transitions. [2019-11-19 22:16:03,641 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-19 22:16:03,641 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 39 transitions. [2019-11-19 22:16:03,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2019-11-19 22:16:03,641 INFO L402 BasicCegarLoop]: Found error trace [2019-11-19 22:16:03,641 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-19 22:16:03,842 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-19 22:16:03,842 INFO L410 AbstractCegarLoop]: === Iteration 5 === [cstrnlenErr0REQUIRES_VIOLATION, cstrnlenErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION]=== [2019-11-19 22:16:03,843 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-19 22:16:03,843 INFO L82 PathProgramCache]: Analyzing trace with hash 789593439, now seen corresponding path program 1 times [2019-11-19 22:16:03,843 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-19 22:16:03,843 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [1279288636] [2019-11-19 22:16:03,844 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_5ca48234-9c09-44bd-ae15-9e144e957967/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 22:16:03,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-19 22:16:03,999 INFO L255 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 7 conjunts are in the unsatisfiable core [2019-11-19 22:16:04,001 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-19 22:16:04,023 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 22:16:04,023 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-19 22:16:04,056 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-19 22:16:04,057 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-19 22:16:04,057 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:17, output treesize:13 [2019-11-19 22:16:04,082 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 22:16:04,082 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-19 22:16:04,184 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 22:16:04,185 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1279288636] [2019-11-19 22:16:04,185 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-19 22:16:04,185 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2019-11-19 22:16:04,185 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2129361627] [2019-11-19 22:16:04,186 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-19 22:16:04,186 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-19 22:16:04,186 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-19 22:16:04,186 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2019-11-19 22:16:04,187 INFO L87 Difference]: Start difference. First operand 34 states and 39 transitions. Second operand 5 states. [2019-11-19 22:16:04,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-19 22:16:04,425 INFO L93 Difference]: Finished difference Result 43 states and 49 transitions. [2019-11-19 22:16:04,426 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-19 22:16:04,426 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 11 [2019-11-19 22:16:04,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-19 22:16:04,427 INFO L225 Difference]: With dead ends: 43 [2019-11-19 22:16:04,427 INFO L226 Difference]: Without dead ends: 43 [2019-11-19 22:16:04,427 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2019-11-19 22:16:04,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2019-11-19 22:16:04,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 36. [2019-11-19 22:16:04,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2019-11-19 22:16:04,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 42 transitions. [2019-11-19 22:16:04,432 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 42 transitions. Word has length 11 [2019-11-19 22:16:04,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-19 22:16:04,432 INFO L462 AbstractCegarLoop]: Abstraction has 36 states and 42 transitions. [2019-11-19 22:16:04,432 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-19 22:16:04,433 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 42 transitions. [2019-11-19 22:16:04,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-11-19 22:16:04,433 INFO L402 BasicCegarLoop]: Found error trace [2019-11-19 22:16:04,433 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-19 22:16:04,634 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-19 22:16:04,634 INFO L410 AbstractCegarLoop]: === Iteration 6 === [cstrnlenErr0REQUIRES_VIOLATION, cstrnlenErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION]=== [2019-11-19 22:16:04,634 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-19 22:16:04,634 INFO L82 PathProgramCache]: Analyzing trace with hash 849748688, now seen corresponding path program 1 times [2019-11-19 22:16:04,635 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-19 22:16:04,635 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [1456980223] [2019-11-19 22:16:04,635 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_5ca48234-9c09-44bd-ae15-9e144e957967/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 22:16:04,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-19 22:16:04,792 INFO L255 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 7 conjunts are in the unsatisfiable core [2019-11-19 22:16:04,793 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-19 22:16:04,805 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 22:16:04,805 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-19 22:16:04,808 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-19 22:16:04,808 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-19 22:16:04,808 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:6, output treesize:5 [2019-11-19 22:16:04,834 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 22:16:04,835 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-19 22:16:04,842 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 22:16:04,842 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1456980223] [2019-11-19 22:16:04,842 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-19 22:16:04,842 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 4 [2019-11-19 22:16:04,842 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1080648904] [2019-11-19 22:16:04,843 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-19 22:16:04,843 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-19 22:16:04,843 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-19 22:16:04,843 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-11-19 22:16:04,844 INFO L87 Difference]: Start difference. First operand 36 states and 42 transitions. Second operand 5 states. [2019-11-19 22:16:04,943 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-19 22:16:04,944 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2019-11-19 22:16:04,944 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-19 22:16:04,944 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 16 [2019-11-19 22:16:04,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-19 22:16:04,945 INFO L225 Difference]: With dead ends: 35 [2019-11-19 22:16:04,945 INFO L226 Difference]: Without dead ends: 35 [2019-11-19 22:16:04,945 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2019-11-19 22:16:04,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2019-11-19 22:16:04,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2019-11-19 22:16:04,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2019-11-19 22:16:04,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 41 transitions. [2019-11-19 22:16:04,949 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 41 transitions. Word has length 16 [2019-11-19 22:16:04,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-19 22:16:04,949 INFO L462 AbstractCegarLoop]: Abstraction has 35 states and 41 transitions. [2019-11-19 22:16:04,950 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-19 22:16:04,950 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 41 transitions. [2019-11-19 22:16:04,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-11-19 22:16:04,950 INFO L402 BasicCegarLoop]: Found error trace [2019-11-19 22:16:04,950 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-19 22:16:05,151 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-19 22:16:05,151 INFO L410 AbstractCegarLoop]: === Iteration 7 === [cstrnlenErr0REQUIRES_VIOLATION, cstrnlenErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION]=== [2019-11-19 22:16:05,151 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-19 22:16:05,152 INFO L82 PathProgramCache]: Analyzing trace with hash 849748689, now seen corresponding path program 1 times [2019-11-19 22:16:05,152 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-19 22:16:05,152 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [677415966] [2019-11-19 22:16:05,152 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_5ca48234-9c09-44bd-ae15-9e144e957967/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 22:16:05,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-19 22:16:05,289 INFO L255 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 12 conjunts are in the unsatisfiable core [2019-11-19 22:16:05,291 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-19 22:16:05,300 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 22:16:05,300 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-19 22:16:05,305 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-19 22:16:05,305 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-19 22:16:05,305 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:10, output treesize:9 [2019-11-19 22:16:05,351 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 22:16:05,351 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-19 22:16:05,596 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 22:16:05,597 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [677415966] [2019-11-19 22:16:05,597 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-19 22:16:05,597 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [] total 9 [2019-11-19 22:16:05,597 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [126363344] [2019-11-19 22:16:05,597 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-11-19 22:16:05,597 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-19 22:16:05,598 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-11-19 22:16:05,598 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2019-11-19 22:16:05,598 INFO L87 Difference]: Start difference. First operand 35 states and 41 transitions. Second operand 10 states. [2019-11-19 22:16:06,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-19 22:16:06,084 INFO L93 Difference]: Finished difference Result 73 states and 85 transitions. [2019-11-19 22:16:06,085 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-11-19 22:16:06,085 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 16 [2019-11-19 22:16:06,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-19 22:16:06,088 INFO L225 Difference]: With dead ends: 73 [2019-11-19 22:16:06,088 INFO L226 Difference]: Without dead ends: 73 [2019-11-19 22:16:06,088 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=50, Invalid=160, Unknown=0, NotChecked=0, Total=210 [2019-11-19 22:16:06,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2019-11-19 22:16:06,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 38. [2019-11-19 22:16:06,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2019-11-19 22:16:06,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 45 transitions. [2019-11-19 22:16:06,093 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 45 transitions. Word has length 16 [2019-11-19 22:16:06,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-19 22:16:06,093 INFO L462 AbstractCegarLoop]: Abstraction has 38 states and 45 transitions. [2019-11-19 22:16:06,093 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-11-19 22:16:06,094 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 45 transitions. [2019-11-19 22:16:06,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-11-19 22:16:06,094 INFO L402 BasicCegarLoop]: Found error trace [2019-11-19 22:16:06,094 INFO L410 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-19 22:16:06,297 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-19 22:16:06,297 INFO L410 AbstractCegarLoop]: === Iteration 8 === [cstrnlenErr0REQUIRES_VIOLATION, cstrnlenErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION]=== [2019-11-19 22:16:06,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-19 22:16:06,297 INFO L82 PathProgramCache]: Analyzing trace with hash -2015068958, now seen corresponding path program 1 times [2019-11-19 22:16:06,298 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-19 22:16:06,298 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [346442351] [2019-11-19 22:16:06,298 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_5ca48234-9c09-44bd-ae15-9e144e957967/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 22:16:06,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-19 22:16:06,430 INFO L255 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 10 conjunts are in the unsatisfiable core [2019-11-19 22:16:06,431 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-19 22:16:06,448 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 22:16:06,448 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-19 22:16:06,457 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-19 22:16:06,458 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-19 22:16:06,458 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:17, output treesize:16 [2019-11-19 22:16:06,548 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 22:16:06,548 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-19 22:16:06,993 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 22:16:06,993 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [346442351] [2019-11-19 22:16:06,993 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-19 22:16:06,993 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 9 [2019-11-19 22:16:06,993 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [241631198] [2019-11-19 22:16:06,994 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-11-19 22:16:06,994 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-19 22:16:06,994 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-11-19 22:16:06,994 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2019-11-19 22:16:06,994 INFO L87 Difference]: Start difference. First operand 38 states and 45 transitions. Second operand 10 states. [2019-11-19 22:16:07,841 WARN L191 SmtUtils]: Spent 223.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 26 [2019-11-19 22:16:08,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-19 22:16:08,181 INFO L93 Difference]: Finished difference Result 61 states and 70 transitions. [2019-11-19 22:16:08,183 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-11-19 22:16:08,183 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 15 [2019-11-19 22:16:08,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-19 22:16:08,184 INFO L225 Difference]: With dead ends: 61 [2019-11-19 22:16:08,184 INFO L226 Difference]: Without dead ends: 61 [2019-11-19 22:16:08,185 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 19 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=79, Invalid=161, Unknown=0, NotChecked=0, Total=240 [2019-11-19 22:16:08,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2019-11-19 22:16:08,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 46. [2019-11-19 22:16:08,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2019-11-19 22:16:08,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 55 transitions. [2019-11-19 22:16:08,190 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 55 transitions. Word has length 15 [2019-11-19 22:16:08,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-19 22:16:08,190 INFO L462 AbstractCegarLoop]: Abstraction has 46 states and 55 transitions. [2019-11-19 22:16:08,190 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-11-19 22:16:08,190 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 55 transitions. [2019-11-19 22:16:08,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-11-19 22:16:08,191 INFO L402 BasicCegarLoop]: Found error trace [2019-11-19 22:16:08,191 INFO L410 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-19 22:16:08,398 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-19 22:16:08,398 INFO L410 AbstractCegarLoop]: === Iteration 9 === [cstrnlenErr0REQUIRES_VIOLATION, cstrnlenErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION]=== [2019-11-19 22:16:08,398 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-19 22:16:08,398 INFO L82 PathProgramCache]: Analyzing trace with hash 1695397446, now seen corresponding path program 1 times [2019-11-19 22:16:08,398 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-19 22:16:08,399 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [1871135984] [2019-11-19 22:16:08,399 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_5ca48234-9c09-44bd-ae15-9e144e957967/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 22:16:08,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-19 22:16:08,513 INFO L255 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 2 conjunts are in the unsatisfiable core [2019-11-19 22:16:08,514 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-19 22:16:08,517 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-19 22:16:08,517 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-19 22:16:08,524 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-19 22:16:08,524 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1871135984] [2019-11-19 22:16:08,524 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-19 22:16:08,525 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2019-11-19 22:16:08,525 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [694788027] [2019-11-19 22:16:08,525 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-19 22:16:08,525 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-19 22:16:08,525 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-19 22:16:08,525 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-19 22:16:08,525 INFO L87 Difference]: Start difference. First operand 46 states and 55 transitions. Second operand 3 states. [2019-11-19 22:16:08,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-19 22:16:08,535 INFO L93 Difference]: Finished difference Result 47 states and 56 transitions. [2019-11-19 22:16:08,536 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-19 22:16:08,536 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2019-11-19 22:16:08,536 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-19 22:16:08,537 INFO L225 Difference]: With dead ends: 47 [2019-11-19 22:16:08,537 INFO L226 Difference]: Without dead ends: 47 [2019-11-19 22:16:08,538 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 38 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 22:16:08,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2019-11-19 22:16:08,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2019-11-19 22:16:08,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2019-11-19 22:16:08,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 56 transitions. [2019-11-19 22:16:08,543 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 56 transitions. Word has length 20 [2019-11-19 22:16:08,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-19 22:16:08,543 INFO L462 AbstractCegarLoop]: Abstraction has 47 states and 56 transitions. [2019-11-19 22:16:08,543 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-19 22:16:08,543 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 56 transitions. [2019-11-19 22:16:08,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-11-19 22:16:08,544 INFO L402 BasicCegarLoop]: Found error trace [2019-11-19 22:16:08,544 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] [2019-11-19 22:16:08,746 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-19 22:16:08,747 INFO L410 AbstractCegarLoop]: === Iteration 10 === [cstrnlenErr0REQUIRES_VIOLATION, cstrnlenErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION]=== [2019-11-19 22:16:08,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-19 22:16:08,747 INFO L82 PathProgramCache]: Analyzing trace with hash 964873536, now seen corresponding path program 1 times [2019-11-19 22:16:08,747 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-19 22:16:08,747 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [1812506166] [2019-11-19 22:16:08,747 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_5ca48234-9c09-44bd-ae15-9e144e957967/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 22:16:08,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-19 22:16:08,873 INFO L255 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-19 22:16:08,874 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-19 22:16:08,921 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 22:16:08,921 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-19 22:16:09,002 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-19 22:16:09,033 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 22:16:09,033 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1812506166] [2019-11-19 22:16:09,033 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-19 22:16:09,034 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [] total 9 [2019-11-19 22:16:09,034 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [169149034] [2019-11-19 22:16:09,034 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-11-19 22:16:09,034 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-19 22:16:09,034 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-11-19 22:16:09,035 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2019-11-19 22:16:09,035 INFO L87 Difference]: Start difference. First operand 47 states and 56 transitions. Second operand 9 states. [2019-11-19 22:16:09,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-19 22:16:09,133 INFO L93 Difference]: Finished difference Result 80 states and 94 transitions. [2019-11-19 22:16:09,133 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-11-19 22:16:09,133 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 21 [2019-11-19 22:16:09,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-19 22:16:09,134 INFO L225 Difference]: With dead ends: 80 [2019-11-19 22:16:09,135 INFO L226 Difference]: Without dead ends: 76 [2019-11-19 22:16:09,135 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2019-11-19 22:16:09,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2019-11-19 22:16:09,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 47. [2019-11-19 22:16:09,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2019-11-19 22:16:09,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 55 transitions. [2019-11-19 22:16:09,140 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 55 transitions. Word has length 21 [2019-11-19 22:16:09,141 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-19 22:16:09,141 INFO L462 AbstractCegarLoop]: Abstraction has 47 states and 55 transitions. [2019-11-19 22:16:09,141 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-11-19 22:16:09,141 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 55 transitions. [2019-11-19 22:16:09,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-11-19 22:16:09,142 INFO L402 BasicCegarLoop]: Found error trace [2019-11-19 22:16:09,142 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-19 22:16:09,344 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-19 22:16:09,344 INFO L410 AbstractCegarLoop]: === Iteration 11 === [cstrnlenErr0REQUIRES_VIOLATION, cstrnlenErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION]=== [2019-11-19 22:16:09,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-19 22:16:09,345 INFO L82 PathProgramCache]: Analyzing trace with hash -1827219927, now seen corresponding path program 1 times [2019-11-19 22:16:09,345 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-19 22:16:09,345 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [571623470] [2019-11-19 22:16:09,345 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_5ca48234-9c09-44bd-ae15-9e144e957967/bin/uautomizer/cvc4 Starting monitored process 12 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-19 22:16:09,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-19 22:16:09,486 INFO L255 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-19 22:16:09,487 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-19 22:16:09,517 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-19 22:16:09,517 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-19 22:16:09,518 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-19 22:16:09,537 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-19 22:16:09,537 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [571623470] [2019-11-19 22:16:09,537 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-19 22:16:09,537 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2019-11-19 22:16:09,537 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [707939033] [2019-11-19 22:16:09,538 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-11-19 22:16:09,538 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-19 22:16:09,538 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-11-19 22:16:09,538 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2019-11-19 22:16:09,538 INFO L87 Difference]: Start difference. First operand 47 states and 55 transitions. Second operand 7 states. [2019-11-19 22:16:09,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-19 22:16:09,636 INFO L93 Difference]: Finished difference Result 86 states and 98 transitions. [2019-11-19 22:16:09,637 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-11-19 22:16:09,637 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 22 [2019-11-19 22:16:09,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-19 22:16:09,638 INFO L225 Difference]: With dead ends: 86 [2019-11-19 22:16:09,638 INFO L226 Difference]: Without dead ends: 86 [2019-11-19 22:16:09,639 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 36 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2019-11-19 22:16:09,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2019-11-19 22:16:09,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 79. [2019-11-19 22:16:09,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2019-11-19 22:16:09,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 93 transitions. [2019-11-19 22:16:09,651 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 93 transitions. Word has length 22 [2019-11-19 22:16:09,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-19 22:16:09,652 INFO L462 AbstractCegarLoop]: Abstraction has 79 states and 93 transitions. [2019-11-19 22:16:09,652 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-11-19 22:16:09,652 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 93 transitions. [2019-11-19 22:16:09,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-11-19 22:16:09,655 INFO L402 BasicCegarLoop]: Found error trace [2019-11-19 22:16:09,655 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-19 22:16:09,865 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-19 22:16:09,865 INFO L410 AbstractCegarLoop]: === Iteration 12 === [cstrnlenErr0REQUIRES_VIOLATION, cstrnlenErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION]=== [2019-11-19 22:16:09,866 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-19 22:16:09,866 INFO L82 PathProgramCache]: Analyzing trace with hash 1187883691, now seen corresponding path program 1 times [2019-11-19 22:16:09,866 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-19 22:16:09,866 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [1978501955] [2019-11-19 22:16:09,866 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_5ca48234-9c09-44bd-ae15-9e144e957967/bin/uautomizer/cvc4 Starting monitored process 13 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-19 22:16:10,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-19 22:16:10,006 INFO L255 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 14 conjunts are in the unsatisfiable core [2019-11-19 22:16:10,007 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-19 22:16:10,029 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 12 treesize of output 8 [2019-11-19 22:16:10,030 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-19 22:16:10,035 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-19 22:16:10,036 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-19 22:16:10,036 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:16, output treesize:12 [2019-11-19 22:16:10,072 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 17 treesize of output 9 [2019-11-19 22:16:10,073 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-19 22:16:10,074 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-19 22:16:10,074 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 22:16:10,075 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:17, output treesize:5 [2019-11-19 22:16:10,097 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-19 22:16:10,097 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-19 22:16:10,098 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-19 22:16:10,165 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 17 treesize of output 15 [2019-11-19 22:16:10,172 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 23 treesize of output 21 [2019-11-19 22:16:10,177 INFO L496 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2019-11-19 22:16:10,180 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-19 22:16:10,180 INFO L496 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-19 22:16:10,182 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-19 22:16:10,183 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-19 22:16:10,183 INFO L221 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:17, output treesize:6 [2019-11-19 22:16:10,191 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-19 22:16:10,191 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1978501955] [2019-11-19 22:16:10,191 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-19 22:16:10,191 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9, 8] imperfect sequences [] total 12 [2019-11-19 22:16:10,192 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [513783567] [2019-11-19 22:16:10,192 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-11-19 22:16:10,192 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-19 22:16:10,192 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-11-19 22:16:10,193 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=107, Unknown=0, NotChecked=0, Total=132 [2019-11-19 22:16:10,193 INFO L87 Difference]: Start difference. First operand 79 states and 93 transitions. Second operand 12 states. [2019-11-19 22:16:10,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-19 22:16:10,480 INFO L93 Difference]: Finished difference Result 104 states and 117 transitions. [2019-11-19 22:16:10,481 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-11-19 22:16:10,481 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 22 [2019-11-19 22:16:10,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-19 22:16:10,482 INFO L225 Difference]: With dead ends: 104 [2019-11-19 22:16:10,482 INFO L226 Difference]: Without dead ends: 104 [2019-11-19 22:16:10,483 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 31 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=55, Invalid=185, Unknown=0, NotChecked=0, Total=240 [2019-11-19 22:16:10,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2019-11-19 22:16:10,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 88. [2019-11-19 22:16:10,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2019-11-19 22:16:10,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 102 transitions. [2019-11-19 22:16:10,490 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 102 transitions. Word has length 22 [2019-11-19 22:16:10,490 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-19 22:16:10,490 INFO L462 AbstractCegarLoop]: Abstraction has 88 states and 102 transitions. [2019-11-19 22:16:10,490 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-11-19 22:16:10,490 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 102 transitions. [2019-11-19 22:16:10,491 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-11-19 22:16:10,491 INFO L402 BasicCegarLoop]: Found error trace [2019-11-19 22:16:10,492 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-19 22:16:10,692 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-19 22:16:10,692 INFO L410 AbstractCegarLoop]: === Iteration 13 === [cstrnlenErr0REQUIRES_VIOLATION, cstrnlenErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION]=== [2019-11-19 22:16:10,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-19 22:16:10,692 INFO L82 PathProgramCache]: Analyzing trace with hash 166815337, now seen corresponding path program 1 times [2019-11-19 22:16:10,693 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-19 22:16:10,693 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [509691885] [2019-11-19 22:16:10,693 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_5ca48234-9c09-44bd-ae15-9e144e957967/bin/uautomizer/cvc4 Starting monitored process 14 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-19 22:16:10,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-19 22:16:10,838 INFO L255 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 20 conjunts are in the unsatisfiable core [2019-11-19 22:16:10,839 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-19 22:16:10,863 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 22:16:10,863 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-19 22:16:10,872 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-19 22:16:10,872 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-19 22:16:10,872 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:14, output treesize:13 [2019-11-19 22:16:10,894 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 17 treesize of output 13 [2019-11-19 22:16:10,894 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-19 22:16:10,925 INFO L567 ElimStorePlain]: treesize reduction 20, result has 53.5 percent of original size [2019-11-19 22:16:10,926 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-19 22:16:10,926 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:47, output treesize:23 [2019-11-19 22:16:11,054 INFO L343 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2019-11-19 22:16:11,055 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 21 [2019-11-19 22:16:11,055 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-19 22:16:11,056 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-19 22:16:11,057 INFO L496 ElimStorePlain]: Start of recursive call 2: 1 dim-0 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2019-11-19 22:16:11,072 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-19 22:16:11,072 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-19 22:16:11,073 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2019-11-19 22:16:11,073 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:30, output treesize:27 [2019-11-19 22:16:11,074 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-19 22:16:11,122 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-19 22:16:11,123 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-19 22:16:11,124 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-19 22:16:11,124 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-19 22:16:11,463 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-19 22:16:11,464 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-19 22:16:11,702 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-19 22:16:12,244 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 40 treesize of output 38 [2019-11-19 22:16:12,272 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 29 treesize of output 27 [2019-11-19 22:16:12,273 INFO L496 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 2 xjuncts. [2019-11-19 22:16:12,341 INFO L567 ElimStorePlain]: treesize reduction 7, result has 81.1 percent of original size [2019-11-19 22:16:12,341 INFO L496 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-19 22:16:12,366 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 40 treesize of output 38 [2019-11-19 22:16:12,402 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 29 treesize of output 27 [2019-11-19 22:16:12,408 INFO L496 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 2 xjuncts. [2019-11-19 22:16:12,535 WARN L191 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2019-11-19 22:16:12,535 INFO L567 ElimStorePlain]: treesize reduction 7, result has 81.1 percent of original size [2019-11-19 22:16:12,536 INFO L496 ElimStorePlain]: Start of recursive call 4: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-19 22:16:12,553 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 38 treesize of output 36 [2019-11-19 22:16:12,558 INFO L172 IndexEqualityManager]: detected equality via solver [2019-11-19 22:16:12,564 INFO L172 IndexEqualityManager]: detected equality via solver [2019-11-19 22:16:12,569 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 7 treesize of output 5 [2019-11-19 22:16:12,570 INFO L496 ElimStorePlain]: Start of recursive call 7: End of recursive call: and 1 xjuncts. [2019-11-19 22:16:12,584 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-19 22:16:12,584 INFO L496 ElimStorePlain]: Start of recursive call 6: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-19 22:16:12,684 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-19 22:16:12,684 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 3 xjuncts. [2019-11-19 22:16:12,684 INFO L221 ElimStorePlain]: Needed 7 recursive calls to eliminate 1 variables, input treesize:119, output treesize:83 [2019-11-19 22:16:12,927 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-19 22:16:12,927 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [509691885] [2019-11-19 22:16:12,927 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-19 22:16:12,928 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 18 [2019-11-19 22:16:12,928 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1351035958] [2019-11-19 22:16:12,928 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-11-19 22:16:12,928 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-19 22:16:12,928 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-11-19 22:16:12,929 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=286, Unknown=0, NotChecked=0, Total=342 [2019-11-19 22:16:12,929 INFO L87 Difference]: Start difference. First operand 88 states and 102 transitions. Second operand 19 states. [2019-11-19 22:16:13,173 WARN L191 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 25 [2019-11-19 22:16:13,913 WARN L191 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 44 DAG size of output: 44 [2019-11-19 22:16:20,182 WARN L191 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 33 [2019-11-19 22:16:22,435 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-19 22:16:22,436 INFO L93 Difference]: Finished difference Result 114 states and 132 transitions. [2019-11-19 22:16:22,436 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-11-19 22:16:22,436 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 22 [2019-11-19 22:16:22,437 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-19 22:16:22,437 INFO L225 Difference]: With dead ends: 114 [2019-11-19 22:16:22,437 INFO L226 Difference]: Without dead ends: 114 [2019-11-19 22:16:22,438 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 177 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=211, Invalid=911, Unknown=0, NotChecked=0, Total=1122 [2019-11-19 22:16:22,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2019-11-19 22:16:22,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 100. [2019-11-19 22:16:22,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2019-11-19 22:16:22,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 118 transitions. [2019-11-19 22:16:22,445 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 118 transitions. Word has length 22 [2019-11-19 22:16:22,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-19 22:16:22,445 INFO L462 AbstractCegarLoop]: Abstraction has 100 states and 118 transitions. [2019-11-19 22:16:22,445 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-11-19 22:16:22,445 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 118 transitions. [2019-11-19 22:16:22,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2019-11-19 22:16:22,446 INFO L402 BasicCegarLoop]: Found error trace [2019-11-19 22:16:22,446 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, 1] [2019-11-19 22:16:22,647 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-19 22:16:22,647 INFO L410 AbstractCegarLoop]: === Iteration 14 === [cstrnlenErr0REQUIRES_VIOLATION, cstrnlenErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION]=== [2019-11-19 22:16:22,647 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-19 22:16:22,647 INFO L82 PathProgramCache]: Analyzing trace with hash -862082627, now seen corresponding path program 1 times [2019-11-19 22:16:22,647 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-19 22:16:22,647 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [1062859551] [2019-11-19 22:16:22,648 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_5ca48234-9c09-44bd-ae15-9e144e957967/bin/uautomizer/cvc4 Starting monitored process 15 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-19 22:16:22,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-19 22:16:22,792 INFO L255 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 7 conjunts are in the unsatisfiable core [2019-11-19 22:16:22,793 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-19 22:16:22,800 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 22:16:22,800 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-19 22:16:22,801 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-19 22:16:22,802 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-19 22:16:22,802 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:6, output treesize:5 [2019-11-19 22:16:22,847 INFO L343 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2019-11-19 22:16:22,848 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 39 [2019-11-19 22:16:22,848 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-19 22:16:22,871 INFO L567 ElimStorePlain]: treesize reduction 10, result has 60.0 percent of original size [2019-11-19 22:16:22,872 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-19 22:16:22,873 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2019-11-19 22:16:22,873 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:17, output treesize:15 [2019-11-19 22:16:22,873 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-19 22:16:22,884 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-19 22:16:22,901 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-19 22:16:22,916 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-19 22:16:22,932 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-19 22:16:22,946 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-19 22:16:22,959 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-19 22:16:22,974 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-19 22:16:22,984 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-19 22:16:22,992 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-19 22:16:23,008 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 22:16:23,008 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-19 22:16:26,819 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 22:16:26,820 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1062859551] [2019-11-19 22:16:26,820 INFO L220 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-19 22:16:26,820 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 4] imperfect sequences [] total 8 [2019-11-19 22:16:26,820 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [447538284] [2019-11-19 22:16:26,821 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-11-19 22:16:26,821 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-19 22:16:26,821 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-11-19 22:16:26,821 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=50, Unknown=1, NotChecked=0, Total=72 [2019-11-19 22:16:26,821 INFO L87 Difference]: Start difference. First operand 100 states and 118 transitions. Second operand 9 states. [2019-11-19 22:16:27,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-19 22:16:27,045 INFO L93 Difference]: Finished difference Result 99 states and 117 transitions. [2019-11-19 22:16:27,045 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-19 22:16:27,045 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 23 [2019-11-19 22:16:27,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-19 22:16:27,046 INFO L225 Difference]: With dead ends: 99 [2019-11-19 22:16:27,046 INFO L226 Difference]: Without dead ends: 64 [2019-11-19 22:16:27,046 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 29 SyntacticMatches, 10 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=34, Invalid=75, Unknown=1, NotChecked=0, Total=110 [2019-11-19 22:16:27,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2019-11-19 22:16:27,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2019-11-19 22:16:27,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2019-11-19 22:16:27,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 70 transitions. [2019-11-19 22:16:27,049 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 70 transitions. Word has length 23 [2019-11-19 22:16:27,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-19 22:16:27,050 INFO L462 AbstractCegarLoop]: Abstraction has 64 states and 70 transitions. [2019-11-19 22:16:27,050 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-11-19 22:16:27,050 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 70 transitions. [2019-11-19 22:16:27,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2019-11-19 22:16:27,051 INFO L402 BasicCegarLoop]: Found error trace [2019-11-19 22:16:27,051 INFO L410 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-19 22:16:27,253 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-19 22:16:27,253 INFO L410 AbstractCegarLoop]: === Iteration 15 === [cstrnlenErr0REQUIRES_VIOLATION, cstrnlenErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION]=== [2019-11-19 22:16:27,253 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-19 22:16:27,253 INFO L82 PathProgramCache]: Analyzing trace with hash -790540440, now seen corresponding path program 2 times [2019-11-19 22:16:27,254 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-19 22:16:27,254 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [1025789434] [2019-11-19 22:16:27,254 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_5ca48234-9c09-44bd-ae15-9e144e957967/bin/uautomizer/cvc4 Starting monitored process 16 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-19 22:16:27,435 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-19 22:16:27,435 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-19 22:16:27,436 INFO L255 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 10 conjunts are in the unsatisfiable core [2019-11-19 22:16:27,437 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-19 22:16:27,446 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 22:16:27,446 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-19 22:16:27,455 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-19 22:16:27,455 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-19 22:16:27,455 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:14, output treesize:13 [2019-11-19 22:16:27,651 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2019-11-19 22:16:27,651 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-19 22:16:28,358 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 3 terms [2019-11-19 22:16:29,351 WARN L191 SmtUtils]: Spent 697.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 28 [2019-11-19 22:16:36,871 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2019-11-19 22:16:36,871 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1025789434] [2019-11-19 22:16:36,871 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-19 22:16:36,872 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 11 [2019-11-19 22:16:36,872 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1097267733] [2019-11-19 22:16:36,872 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-11-19 22:16:36,872 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-19 22:16:36,872 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-11-19 22:16:36,872 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=91, Unknown=1, NotChecked=0, Total=132 [2019-11-19 22:16:36,873 INFO L87 Difference]: Start difference. First operand 64 states and 70 transitions. Second operand 12 states. [2019-11-19 22:16:38,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-19 22:16:38,143 INFO L93 Difference]: Finished difference Result 67 states and 72 transitions. [2019-11-19 22:16:38,146 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-19 22:16:38,146 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 23 [2019-11-19 22:16:38,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-19 22:16:38,146 INFO L225 Difference]: With dead ends: 67 [2019-11-19 22:16:38,147 INFO L226 Difference]: Without dead ends: 52 [2019-11-19 22:16:38,147 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 26 SyntacticMatches, 9 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 9.7s TimeCoverageRelationStatistics Valid=76, Invalid=133, Unknown=1, NotChecked=0, Total=210 [2019-11-19 22:16:38,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2019-11-19 22:16:38,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 38. [2019-11-19 22:16:38,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2019-11-19 22:16:38,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 39 transitions. [2019-11-19 22:16:38,149 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 39 transitions. Word has length 23 [2019-11-19 22:16:38,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-19 22:16:38,150 INFO L462 AbstractCegarLoop]: Abstraction has 38 states and 39 transitions. [2019-11-19 22:16:38,150 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-11-19 22:16:38,150 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 39 transitions. [2019-11-19 22:16:38,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2019-11-19 22:16:38,150 INFO L402 BasicCegarLoop]: Found error trace [2019-11-19 22:16:38,151 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-19 22:16:38,354 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-19 22:16:38,354 INFO L410 AbstractCegarLoop]: === Iteration 16 === [cstrnlenErr0REQUIRES_VIOLATION, cstrnlenErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION]=== [2019-11-19 22:16:38,354 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-19 22:16:38,354 INFO L82 PathProgramCache]: Analyzing trace with hash 828655385, now seen corresponding path program 2 times [2019-11-19 22:16:38,354 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-19 22:16:38,355 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [1492864223] [2019-11-19 22:16:38,355 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_5ca48234-9c09-44bd-ae15-9e144e957967/bin/uautomizer/cvc4 Starting monitored process 17 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-19 22:16:38,534 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-19 22:16:38,534 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-19 22:16:38,536 INFO L255 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 22 conjunts are in the unsatisfiable core [2019-11-19 22:16:38,537 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-19 22:16:38,554 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 22:16:38,554 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-19 22:16:38,573 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-19 22:16:38,573 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-19 22:16:38,574 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:17, output treesize:16 [2019-11-19 22:16:38,723 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 18 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-19 22:16:38,724 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-19 22:16:39,798 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-19 22:16:39,798 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1492864223] [2019-11-19 22:16:39,798 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-19 22:16:39,798 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 10] total 17 [2019-11-19 22:16:39,799 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1450696491] [2019-11-19 22:16:39,800 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-11-19 22:16:39,800 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-19 22:16:39,800 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-11-19 22:16:39,800 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=225, Unknown=0, NotChecked=0, Total=272 [2019-11-19 22:16:39,801 INFO L87 Difference]: Start difference. First operand 38 states and 39 transitions. Second operand 17 states. [2019-11-19 22:16:40,688 WARN L191 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 29 [2019-11-19 22:16:41,292 WARN L191 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2019-11-19 22:16:41,885 WARN L191 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2019-11-19 22:16:42,298 WARN L191 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2019-11-19 22:16:42,610 WARN L191 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2019-11-19 22:16:42,882 WARN L191 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2019-11-19 22:16:43,215 WARN L191 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 31 [2019-11-19 22:16:43,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-19 22:16:43,589 INFO L93 Difference]: Finished difference Result 86 states and 88 transitions. [2019-11-19 22:16:43,591 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-11-19 22:16:43,591 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 34 [2019-11-19 22:16:43,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-19 22:16:43,592 INFO L225 Difference]: With dead ends: 86 [2019-11-19 22:16:43,592 INFO L226 Difference]: Without dead ends: 74 [2019-11-19 22:16:43,592 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 50 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 107 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=132, Invalid=680, Unknown=0, NotChecked=0, Total=812 [2019-11-19 22:16:43,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2019-11-19 22:16:43,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 52. [2019-11-19 22:16:43,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2019-11-19 22:16:43,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2019-11-19 22:16:43,595 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 34 [2019-11-19 22:16:43,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-19 22:16:43,596 INFO L462 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2019-11-19 22:16:43,596 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-11-19 22:16:43,596 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2019-11-19 22:16:43,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2019-11-19 22:16:43,597 INFO L402 BasicCegarLoop]: Found error trace [2019-11-19 22:16:43,597 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-19 22:16:43,797 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-19 22:16:43,798 INFO L410 AbstractCegarLoop]: === Iteration 17 === [cstrnlenErr0REQUIRES_VIOLATION, cstrnlenErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION]=== [2019-11-19 22:16:43,798 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-19 22:16:43,798 INFO L82 PathProgramCache]: Analyzing trace with hash 1250412755, now seen corresponding path program 1 times [2019-11-19 22:16:43,798 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-19 22:16:43,798 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [1262143962] [2019-11-19 22:16:43,798 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_5ca48234-9c09-44bd-ae15-9e144e957967/bin/uautomizer/cvc4 Starting monitored process 18 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-19 22:16:43,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-19 22:16:43,996 INFO L255 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 24 conjunts are in the unsatisfiable core [2019-11-19 22:16:43,998 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-19 22:16:44,235 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 22:16:44,235 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-19 22:16:44,251 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-19 22:16:44,252 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2019-11-19 22:16:44,252 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:30, output treesize:26 [2019-11-19 22:16:44,475 INFO L172 IndexEqualityManager]: detected equality via solver [2019-11-19 22:16:44,478 INFO L343 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2019-11-19 22:16:44,479 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 12 [2019-11-19 22:16:44,479 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-19 22:16:44,495 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-19 22:16:44,497 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 22:16:44,498 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:30, output treesize:5 [2019-11-19 22:16:44,577 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 11 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-19 22:16:44,577 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-19 22:16:44,578 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-19 22:16:44,904 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 19 treesize of output 17 [2019-11-19 22:16:44,907 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 29 treesize of output 25 [2019-11-19 22:16:44,909 INFO L496 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2019-11-19 22:16:44,911 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-19 22:16:44,911 INFO L496 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-19 22:16:44,913 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-19 22:16:44,913 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-19 22:16:44,913 INFO L221 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:19, output treesize:8 [2019-11-19 22:16:45,478 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 11 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-19 22:16:45,478 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1262143962] [2019-11-19 22:16:45,478 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-19 22:16:45,478 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 27 [2019-11-19 22:16:45,479 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [374764588] [2019-11-19 22:16:45,479 INFO L442 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-11-19 22:16:45,479 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-19 22:16:45,479 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-11-19 22:16:45,480 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=614, Unknown=0, NotChecked=0, Total=702 [2019-11-19 22:16:45,480 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand 27 states. [2019-11-19 22:16:46,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-19 22:16:46,884 INFO L93 Difference]: Finished difference Result 79 states and 81 transitions. [2019-11-19 22:16:46,885 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-11-19 22:16:46,885 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 42 [2019-11-19 22:16:46,885 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-19 22:16:46,886 INFO L225 Difference]: With dead ends: 79 [2019-11-19 22:16:46,886 INFO L226 Difference]: Without dead ends: 59 [2019-11-19 22:16:46,887 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 56 SyntacticMatches, 2 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 261 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=178, Invalid=1154, Unknown=0, NotChecked=0, Total=1332 [2019-11-19 22:16:46,887 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2019-11-19 22:16:46,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 56. [2019-11-19 22:16:46,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2019-11-19 22:16:46,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2019-11-19 22:16:46,889 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 42 [2019-11-19 22:16:46,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-19 22:16:46,890 INFO L462 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2019-11-19 22:16:46,890 INFO L463 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-11-19 22:16:46,890 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2019-11-19 22:16:46,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2019-11-19 22:16:46,891 INFO L402 BasicCegarLoop]: Found error trace [2019-11-19 22:16:46,891 INFO L410 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-19 22:16:47,091 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-19 22:16:47,092 INFO L410 AbstractCegarLoop]: === Iteration 18 === [cstrnlenErr0REQUIRES_VIOLATION, cstrnlenErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION]=== [2019-11-19 22:16:47,092 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-19 22:16:47,092 INFO L82 PathProgramCache]: Analyzing trace with hash 374261454, now seen corresponding path program 2 times [2019-11-19 22:16:47,092 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-19 22:16:47,092 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [166785352] [2019-11-19 22:16:47,093 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_5ca48234-9c09-44bd-ae15-9e144e957967/bin/uautomizer/cvc4 Starting monitored process 19 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-19 22:16:47,294 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-19 22:16:47,294 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-19 22:16:47,296 INFO L255 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 19 conjunts are in the unsatisfiable core [2019-11-19 22:16:47,297 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-19 22:16:47,302 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 22:16:47,302 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-19 22:16:47,308 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-19 22:16:47,309 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-19 22:16:47,309 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:13, output treesize:12 [2019-11-19 22:16:47,521 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 30 proven. 13 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-19 22:16:47,521 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-19 22:16:48,035 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 30 proven. 13 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-19 22:16:48,036 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [166785352] [2019-11-19 22:16:48,036 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-19 22:16:48,036 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 18 [2019-11-19 22:16:48,036 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1222324376] [2019-11-19 22:16:48,036 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-11-19 22:16:48,037 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-19 22:16:48,037 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-11-19 22:16:48,037 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2019-11-19 22:16:48,037 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand 18 states. [2019-11-19 22:16:48,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-19 22:16:48,670 INFO L93 Difference]: Finished difference Result 65 states and 66 transitions. [2019-11-19 22:16:48,671 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-11-19 22:16:48,671 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 44 [2019-11-19 22:16:48,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-19 22:16:48,672 INFO L225 Difference]: With dead ends: 65 [2019-11-19 22:16:48,672 INFO L226 Difference]: Without dead ends: 47 [2019-11-19 22:16:48,672 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 71 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=85, Invalid=377, Unknown=0, NotChecked=0, Total=462 [2019-11-19 22:16:48,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2019-11-19 22:16:48,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2019-11-19 22:16:48,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2019-11-19 22:16:48,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 48 transitions. [2019-11-19 22:16:48,674 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 48 transitions. Word has length 44 [2019-11-19 22:16:48,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-19 22:16:48,674 INFO L462 AbstractCegarLoop]: Abstraction has 47 states and 48 transitions. [2019-11-19 22:16:48,675 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-11-19 22:16:48,675 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 48 transitions. [2019-11-19 22:16:48,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2019-11-19 22:16:48,676 INFO L402 BasicCegarLoop]: Found error trace [2019-11-19 22:16:48,676 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-19 22:16:48,876 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-19 22:16:48,876 INFO L410 AbstractCegarLoop]: === Iteration 19 === [cstrnlenErr0REQUIRES_VIOLATION, cstrnlenErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION]=== [2019-11-19 22:16:48,877 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-19 22:16:48,877 INFO L82 PathProgramCache]: Analyzing trace with hash 736937968, now seen corresponding path program 3 times [2019-11-19 22:16:48,877 INFO L163 FreeRefinementEngine]: Executing refinement strategy WOLF [2019-11-19 22:16:48,877 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [1324278620] [2019-11-19 22:16:48,877 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_5ca48234-9c09-44bd-ae15-9e144e957967/bin/uautomizer/cvc4 Starting monitored process 20 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-19 22:16:49,141 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2019-11-19 22:16:49,141 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-19 22:16:49,143 INFO L255 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 23 conjunts are in the unsatisfiable core [2019-11-19 22:16:49,144 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-19 22:16:49,152 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 22:16:49,152 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-19 22:16:49,161 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-19 22:16:49,161 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-19 22:16:49,161 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:14, output treesize:13 [2019-11-19 22:16:49,180 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 16 treesize of output 12 [2019-11-19 22:16:49,180 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-19 22:16:49,206 INFO L567 ElimStorePlain]: treesize reduction 23, result has 45.2 percent of original size [2019-11-19 22:16:49,207 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-19 22:16:49,207 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:46, output treesize:19 [2019-11-19 22:16:49,306 INFO L343 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2019-11-19 22:16:49,306 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 21 [2019-11-19 22:16:49,307 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-19 22:16:49,307 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-19 22:16:49,308 INFO L496 ElimStorePlain]: Start of recursive call 2: 1 dim-0 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2019-11-19 22:16:49,375 INFO L567 ElimStorePlain]: treesize reduction 6, result has 84.6 percent of original size [2019-11-19 22:16:49,375 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-19 22:16:49,376 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2019-11-19 22:16:49,376 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:42, output treesize:33 [2019-11-19 22:16:49,376 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-19 22:16:49,499 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-19 22:16:49,500 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-19 22:16:49,500 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-19 22:16:49,501 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-19 22:16:50,128 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2019-11-19 22:16:50,129 INFO L320 TraceCheckSpWp]: Computing backward predicates... [2019-11-19 22:16:50,583 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-19 22:16:50,750 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 3 terms [2019-11-19 22:16:53,115 WARN L191 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 28 [2019-11-19 22:17:28,809 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 66 treesize of output 64 [2019-11-19 22:17:28,885 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 29 treesize of output 27 [2019-11-19 22:17:28,886 INFO L496 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 2 xjuncts. [2019-11-19 22:17:29,052 WARN L191 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 35 DAG size of output: 23 [2019-11-19 22:17:29,052 INFO L567 ElimStorePlain]: treesize reduction 25, result has 60.3 percent of original size [2019-11-19 22:17:29,052 INFO L496 ElimStorePlain]: Start of recursive call 2: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-19 22:17:29,469 WARN L191 SmtUtils]: Spent 416.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 42 [2019-11-19 22:17:29,469 INFO L567 ElimStorePlain]: treesize reduction 28, result has 77.2 percent of original size [2019-11-19 22:17:29,489 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 56 treesize of output 54 [2019-11-19 22:17:29,543 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 29 treesize of output 27 [2019-11-19 22:17:29,545 INFO L496 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 2 xjuncts. [2019-11-19 22:17:29,683 WARN L191 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 25 [2019-11-19 22:17:29,683 INFO L567 ElimStorePlain]: treesize reduction 7, result has 86.8 percent of original size [2019-11-19 22:17:29,684 INFO L496 ElimStorePlain]: Start of recursive call 4: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-11-19 22:17:29,826 WARN L191 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2019-11-19 22:17:29,826 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-19 22:17:29,827 INFO L496 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-2 vars, End of recursive call: 2 dim-0 vars, and 2 xjuncts. [2019-11-19 22:17:29,827 INFO L221 ElimStorePlain]: Needed 5 recursive calls to eliminate 4 variables, input treesize:133, output treesize:85 [2019-11-19 22:17:30,581 WARN L191 SmtUtils]: Spent 251.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2019-11-19 22:17:30,706 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2019-11-19 22:17:30,707 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1324278620] [2019-11-19 22:17:30,707 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-19 22:17:30,707 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 18 [2019-11-19 22:17:30,707 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [822977996] [2019-11-19 22:17:30,708 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-11-19 22:17:30,708 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2019-11-19 22:17:30,708 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-11-19 22:17:30,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=289, Unknown=3, NotChecked=0, Total=342 [2019-11-19 22:17:30,709 INFO L87 Difference]: Start difference. First operand 47 states and 48 transitions. Second operand 19 states. [2019-11-19 22:17:35,335 WARN L191 SmtUtils]: Spent 4.17 s on a formula simplification. DAG size of input: 55 DAG size of output: 37 [2019-11-19 22:17:39,734 WARN L191 SmtUtils]: Spent 4.14 s on a formula simplification. DAG size of input: 49 DAG size of output: 33 [2019-11-19 22:17:48,543 WARN L191 SmtUtils]: Spent 8.37 s on a formula simplification. DAG size of input: 69 DAG size of output: 50 [2019-11-19 22:17:57,963 WARN L191 SmtUtils]: Spent 8.92 s on a formula simplification. DAG size of input: 79 DAG size of output: 58 [2019-11-19 22:18:07,210 WARN L191 SmtUtils]: Spent 8.83 s on a formula simplification. DAG size of input: 84 DAG size of output: 61 [2019-11-19 22:18:21,587 WARN L191 SmtUtils]: Spent 8.60 s on a formula simplification. DAG size of input: 71 DAG size of output: 50 [2019-11-19 22:18:31,169 WARN L191 SmtUtils]: Spent 8.56 s on a formula simplification. DAG size of input: 75 DAG size of output: 54 [2019-11-19 22:18:40,442 WARN L191 SmtUtils]: Spent 8.69 s on a formula simplification. DAG size of input: 85 DAG size of output: 60 [2019-11-19 22:18:49,935 WARN L191 SmtUtils]: Spent 9.12 s on a formula simplification. DAG size of input: 90 DAG size of output: 63 [2019-11-19 22:19:06,922 WARN L191 SmtUtils]: Spent 8.64 s on a formula simplification. DAG size of input: 77 DAG size of output: 52 [2019-11-19 22:19:07,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-19 22:19:07,451 INFO L93 Difference]: Finished difference Result 46 states and 47 transitions. [2019-11-19 22:19:07,455 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-11-19 22:19:07,455 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 46 [2019-11-19 22:19:07,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-19 22:19:07,455 INFO L225 Difference]: With dead ends: 46 [2019-11-19 22:19:07,455 INFO L226 Difference]: Without dead ends: 0 [2019-11-19 22:19:07,456 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 59 SyntacticMatches, 15 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 161 ImplicationChecksByTransitivity, 133.2s TimeCoverageRelationStatistics Valid=168, Invalid=635, Unknown=9, NotChecked=0, Total=812 [2019-11-19 22:19:07,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2019-11-19 22:19:07,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2019-11-19 22:19:07,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2019-11-19 22:19:07,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2019-11-19 22:19:07,456 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 46 [2019-11-19 22:19:07,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-19 22:19:07,456 INFO L462 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2019-11-19 22:19:07,456 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-11-19 22:19:07,457 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2019-11-19 22:19:07,457 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2019-11-19 22:19:07,657 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-11-19 22:19:07,660 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 19.11 10:19:07 BoogieIcfgContainer [2019-11-19 22:19:07,660 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-11-19 22:19:07,661 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2019-11-19 22:19:07,661 INFO L271 PluginConnector]: Initializing Witness Printer... [2019-11-19 22:19:07,661 INFO L275 PluginConnector]: Witness Printer initialized [2019-11-19 22:19:07,662 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 10:16:01" (3/4) ... [2019-11-19 22:19:07,664 INFO L137 WitnessPrinter]: Generating witness for correct program [2019-11-19 22:19:07,669 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure ULTIMATE.init [2019-11-19 22:19:07,669 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure __bswap_32 [2019-11-19 22:19:07,669 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure cstrnlen [2019-11-19 22:19:07,669 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure __bswap_64 [2019-11-19 22:19:07,669 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure __uint16_identity [2019-11-19 22:19:07,669 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure __uint64_identity [2019-11-19 22:19:07,669 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure main [2019-11-19 22:19:07,669 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure __uint32_identity [2019-11-19 22:19:07,672 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 13 nodes and edges [2019-11-19 22:19:07,673 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 7 nodes and edges [2019-11-19 22:19:07,673 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2019-11-19 22:19:07,673 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2019-11-19 22:19:07,709 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_5ca48234-9c09-44bd-ae15-9e144e957967/bin/uautomizer/witness.graphml [2019-11-19 22:19:07,709 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2019-11-19 22:19:07,710 INFO L168 Benchmark]: Toolchain (without parser) took 187716.79 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 153.6 MB). Free memory was 947.3 MB in the beginning and 932.2 MB in the end (delta: 15.1 MB). Peak memory consumption was 168.7 MB. Max. memory is 11.5 GB. [2019-11-19 22:19:07,711 INFO L168 Benchmark]: CDTParser took 0.26 ms. Allocated memory is still 1.0 GB. Free memory is still 966.2 MB. There was no memory consumed. Max. memory is 11.5 GB. [2019-11-19 22:19:07,711 INFO L168 Benchmark]: CACSL2BoogieTranslator took 576.93 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 119.0 MB). Free memory was 947.3 MB in the beginning and 1.1 GB in the end (delta: -155.5 MB). Peak memory consumption was 20.9 MB. Max. memory is 11.5 GB. [2019-11-19 22:19:07,712 INFO L168 Benchmark]: Boogie Preprocessor took 80.27 ms. Allocated memory is still 1.1 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 2.7 MB). Peak memory consumption was 2.7 MB. Max. memory is 11.5 GB. [2019-11-19 22:19:07,712 INFO L168 Benchmark]: RCFGBuilder took 597.61 ms. Allocated memory is still 1.1 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 48.2 MB). Peak memory consumption was 48.2 MB. Max. memory is 11.5 GB. [2019-11-19 22:19:07,712 INFO L168 Benchmark]: TraceAbstraction took 186409.70 ms. Allocated memory was 1.1 GB in the beginning and 1.2 GB in the end (delta: 34.6 MB). Free memory was 1.1 GB in the beginning and 934.5 MB in the end (delta: 116.2 MB). Peak memory consumption was 150.8 MB. Max. memory is 11.5 GB. [2019-11-19 22:19:07,713 INFO L168 Benchmark]: Witness Printer took 48.58 ms. Allocated memory is still 1.2 GB. Free memory was 934.5 MB in the beginning and 932.2 MB in the end (delta: 2.2 MB). Peak memory consumption was 2.2 MB. Max. memory is 11.5 GB. [2019-11-19 22:19:07,714 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.26 ms. Allocated memory is still 1.0 GB. Free memory is still 966.2 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 576.93 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 119.0 MB). Free memory was 947.3 MB in the beginning and 1.1 GB in the end (delta: -155.5 MB). Peak memory consumption was 20.9 MB. Max. memory is 11.5 GB. * Boogie Preprocessor took 80.27 ms. Allocated memory is still 1.1 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 2.7 MB). Peak memory consumption was 2.7 MB. Max. memory is 11.5 GB. * RCFGBuilder took 597.61 ms. Allocated memory is still 1.1 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 48.2 MB). Peak memory consumption was 48.2 MB. Max. memory is 11.5 GB. * TraceAbstraction took 186409.70 ms. Allocated memory was 1.1 GB in the beginning and 1.2 GB in the end (delta: 34.6 MB). Free memory was 1.1 GB in the beginning and 934.5 MB in the end (delta: 116.2 MB). Peak memory consumption was 150.8 MB. Max. memory is 11.5 GB. * Witness Printer took 48.58 ms. Allocated memory is still 1.2 GB. Free memory was 934.5 MB in the beginning and 932.2 MB in the end (delta: 2.2 MB). Peak memory consumption was 2.2 MB. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 517]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 517]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 537]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 537]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 521]: all allocated memory was freed For all program executions holds that all allocated memory was freed at this location - PositiveResult [Line: 534]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 534]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - AllSpecificationsHoldResult: All specifications hold 7 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 9 procedures, 52 locations, 7 error locations. Result: SAFE, OverallTime: 186.3s, OverallIterations: 19, TraceHistogramMax: 5, AutomataDifference: 116.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, HoareTripleCheckerStatistics: 526 SDtfs, 803 SDslu, 2239 SDs, 0 SdLazy, 1676 SolverSat, 189 SolverUnsat, 3 SolverUnknown, 0 SolverNotchecked, 14.4s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 906 GetRequests, 618 SyntacticMatches, 46 SemanticMatches, 242 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 955 ImplicationChecksByTransitivity, 160.7s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=100occurred in iteration=13, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 19 MinimizatonAttempts, 179 StatesRemovedByMinimization, 12 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.9s SatisfiabilityAnalysisTime, 62.5s InterpolantComputationTime, 421 NumberOfCodeBlocks, 421 NumberOfCodeBlocksAsserted, 25 NumberOfCheckSat, 804 ConstructedInterpolants, 75 QuantifiedInterpolants, 325389 SizeOfPredicates, 105 NumberOfNonLiveVariables, 1227 ConjunctsInSsa, 201 ConjunctsInUnsatCore, 38 InterpolantComputations, 22 PerfectInterpolantSequences, 207/364 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...