./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/rec_strlen-alloca-1.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version a4ecdabc Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_70a1d727-352c-4c96-bbb4-84721fb4bc9a/bin/uautomizer/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_70a1d727-352c-4c96-bbb4-84721fb4bc9a/bin/uautomizer/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_70a1d727-352c-4c96-bbb4-84721fb4bc9a/bin/uautomizer/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_70a1d727-352c-4c96-bbb4-84721fb4bc9a/bin/uautomizer/config/AutomizerMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/rec_strlen-alloca-1.i -s /tmp/vcloud-vcloud-master/worker/run_dir_70a1d727-352c-4c96-bbb4-84721fb4bc9a/bin/uautomizer/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_70a1d727-352c-4c96-bbb4-84721fb4bc9a/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 1915ee2ae984f6ece38fc0dcbac99e0ba37faddf .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................. Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.2.0-a4ecdab [2020-11-29 22:49:26,882 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-29 22:49:26,890 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-29 22:49:26,937 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-29 22:49:26,938 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-29 22:49:26,942 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-29 22:49:26,945 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-29 22:49:26,949 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-29 22:49:26,952 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-29 22:49:26,957 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-29 22:49:26,959 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-29 22:49:26,961 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-29 22:49:26,961 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-29 22:49:26,965 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-29 22:49:26,966 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-29 22:49:26,969 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-29 22:49:26,971 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-29 22:49:26,974 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-29 22:49:26,978 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-29 22:49:26,985 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-29 22:49:26,988 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-29 22:49:26,989 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-29 22:49:26,991 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-29 22:49:26,992 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-29 22:49:27,001 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-11-29 22:49:27,002 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-11-29 22:49:27,002 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-11-29 22:49:27,004 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-11-29 22:49:27,005 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-11-29 22:49:27,006 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-11-29 22:49:27,007 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-11-29 22:49:27,008 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-11-29 22:49:27,010 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-11-29 22:49:27,011 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-11-29 22:49:27,013 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-11-29 22:49:27,014 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-11-29 22:49:27,014 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-11-29 22:49:27,015 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-11-29 22:49:27,015 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-29 22:49:27,016 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-29 22:49:27,017 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-29 22:49:27,017 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_70a1d727-352c-4c96-bbb4-84721fb4bc9a/bin/uautomizer/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2020-11-29 22:49:27,061 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-29 22:49:27,065 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-29 22:49:27,066 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-11-29 22:49:27,067 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-11-29 22:49:27,067 INFO L138 SettingsManager]: * Use SBE=true [2020-11-29 22:49:27,067 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-29 22:49:27,068 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-29 22:49:27,068 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2020-11-29 22:49:27,068 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-29 22:49:27,068 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-29 22:49:27,070 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-29 22:49:27,070 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2020-11-29 22:49:27,070 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2020-11-29 22:49:27,070 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2020-11-29 22:49:27,071 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-29 22:49:27,071 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-11-29 22:49:27,071 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-29 22:49:27,071 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-29 22:49:27,071 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-29 22:49:27,072 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-11-29 22:49:27,072 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-29 22:49:27,072 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-29 22:49:27,072 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-29 22:49:27,073 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-29 22:49:27,073 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-11-29 22:49:27,073 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-11-29 22:49:27,073 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-11-29 22:49:27,074 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-29 22:49:27,074 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud-vcloud-master/worker/run_dir_70a1d727-352c-4c96-bbb4-84721fb4bc9a/bin/uautomizer/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_70a1d727-352c-4c96-bbb4-84721fb4bc9a/bin/uautomizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 1915ee2ae984f6ece38fc0dcbac99e0ba37faddf [2020-11-29 22:49:27,387 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-29 22:49:27,418 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-29 22:49:27,421 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-29 22:49:27,422 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-29 22:49:27,423 INFO L275 PluginConnector]: CDTParser initialized [2020-11-29 22:49:27,424 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_70a1d727-352c-4c96-bbb4-84721fb4bc9a/bin/uautomizer/../../sv-benchmarks/c/array-memsafety/rec_strlen-alloca-1.i [2020-11-29 22:49:27,499 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_70a1d727-352c-4c96-bbb4-84721fb4bc9a/bin/uautomizer/data/bf1ddf445/fa6bb4c6a506474aad6c35ac769bb35e/FLAG3df13f510 [2020-11-29 22:49:28,003 INFO L306 CDTParser]: Found 1 translation units. [2020-11-29 22:49:28,009 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_70a1d727-352c-4c96-bbb4-84721fb4bc9a/sv-benchmarks/c/array-memsafety/rec_strlen-alloca-1.i [2020-11-29 22:49:28,022 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_70a1d727-352c-4c96-bbb4-84721fb4bc9a/bin/uautomizer/data/bf1ddf445/fa6bb4c6a506474aad6c35ac769bb35e/FLAG3df13f510 [2020-11-29 22:49:28,504 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_70a1d727-352c-4c96-bbb4-84721fb4bc9a/bin/uautomizer/data/bf1ddf445/fa6bb4c6a506474aad6c35ac769bb35e [2020-11-29 22:49:28,507 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-29 22:49:28,508 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2020-11-29 22:49:28,510 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-29 22:49:28,511 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-29 22:49:28,515 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-29 22:49:28,516 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 29.11 10:49:28" (1/1) ... [2020-11-29 22:49:28,517 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6ce893c4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 10:49:28, skipping insertion in model container [2020-11-29 22:49:28,518 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 29.11 10:49:28" (1/1) ... [2020-11-29 22:49:28,525 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-29 22:49:28,580 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-29 22:49:28,899 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-29 22:49:28,911 INFO L203 MainTranslator]: Completed pre-run [2020-11-29 22:49:28,961 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-29 22:49:29,027 INFO L208 MainTranslator]: Completed translation [2020-11-29 22:49:29,027 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 10:49:29 WrapperNode [2020-11-29 22:49:29,028 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-29 22:49:29,029 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-29 22:49:29,030 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-29 22:49:29,030 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-29 22:49:29,041 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 10:49:29" (1/1) ... [2020-11-29 22:49:29,041 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 10:49:29" (1/1) ... [2020-11-29 22:49:29,064 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 10:49:29" (1/1) ... [2020-11-29 22:49:29,064 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 10:49:29" (1/1) ... [2020-11-29 22:49:29,077 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 10:49:29" (1/1) ... [2020-11-29 22:49:29,081 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 10:49:29" (1/1) ... [2020-11-29 22:49:29,084 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 10:49:29" (1/1) ... [2020-11-29 22:49:29,090 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-29 22:49:29,091 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-29 22:49:29,091 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-29 22:49:29,091 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-29 22:49:29,092 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 10:49:29" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_70a1d727-352c-4c96-bbb4-84721fb4bc9a/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 [2020-11-29 22:49:29,155 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-11-29 22:49:29,156 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-29 22:49:29,156 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_32 [2020-11-29 22:49:29,156 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_64 [2020-11-29 22:49:29,156 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint16_identity [2020-11-29 22:49:29,156 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint32_identity [2020-11-29 22:49:29,157 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint64_identity [2020-11-29 22:49:29,157 INFO L138 BoogieDeclarations]: Found implementation of procedure strlen_rec [2020-11-29 22:49:29,157 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-11-29 22:49:29,157 INFO L130 BoogieDeclarations]: Found specification of procedure __ctype_get_mb_cur_max [2020-11-29 22:49:29,157 INFO L130 BoogieDeclarations]: Found specification of procedure atof [2020-11-29 22:49:29,158 INFO L130 BoogieDeclarations]: Found specification of procedure atoi [2020-11-29 22:49:29,158 INFO L130 BoogieDeclarations]: Found specification of procedure atol [2020-11-29 22:49:29,158 INFO L130 BoogieDeclarations]: Found specification of procedure atoll [2020-11-29 22:49:29,158 INFO L130 BoogieDeclarations]: Found specification of procedure strtod [2020-11-29 22:49:29,158 INFO L130 BoogieDeclarations]: Found specification of procedure strtof [2020-11-29 22:49:29,158 INFO L130 BoogieDeclarations]: Found specification of procedure strtold [2020-11-29 22:49:29,159 INFO L130 BoogieDeclarations]: Found specification of procedure strtol [2020-11-29 22:49:29,159 INFO L130 BoogieDeclarations]: Found specification of procedure strtoul [2020-11-29 22:49:29,159 INFO L130 BoogieDeclarations]: Found specification of procedure strtoq [2020-11-29 22:49:29,159 INFO L130 BoogieDeclarations]: Found specification of procedure strtouq [2020-11-29 22:49:29,159 INFO L130 BoogieDeclarations]: Found specification of procedure strtoll [2020-11-29 22:49:29,160 INFO L130 BoogieDeclarations]: Found specification of procedure strtoull [2020-11-29 22:49:29,160 INFO L130 BoogieDeclarations]: Found specification of procedure l64a [2020-11-29 22:49:29,160 INFO L130 BoogieDeclarations]: Found specification of procedure a64l [2020-11-29 22:49:29,160 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_32 [2020-11-29 22:49:29,160 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_64 [2020-11-29 22:49:29,160 INFO L130 BoogieDeclarations]: Found specification of procedure __uint16_identity [2020-11-29 22:49:29,161 INFO L130 BoogieDeclarations]: Found specification of procedure __uint32_identity [2020-11-29 22:49:29,161 INFO L130 BoogieDeclarations]: Found specification of procedure __uint64_identity [2020-11-29 22:49:29,161 INFO L130 BoogieDeclarations]: Found specification of procedure select [2020-11-29 22:49:29,161 INFO L130 BoogieDeclarations]: Found specification of procedure pselect [2020-11-29 22:49:29,161 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_major [2020-11-29 22:49:29,162 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_minor [2020-11-29 22:49:29,162 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_makedev [2020-11-29 22:49:29,162 INFO L130 BoogieDeclarations]: Found specification of procedure random [2020-11-29 22:49:29,162 INFO L130 BoogieDeclarations]: Found specification of procedure srandom [2020-11-29 22:49:29,162 INFO L130 BoogieDeclarations]: Found specification of procedure initstate [2020-11-29 22:49:29,162 INFO L130 BoogieDeclarations]: Found specification of procedure setstate [2020-11-29 22:49:29,162 INFO L130 BoogieDeclarations]: Found specification of procedure random_r [2020-11-29 22:49:29,163 INFO L130 BoogieDeclarations]: Found specification of procedure srandom_r [2020-11-29 22:49:29,163 INFO L130 BoogieDeclarations]: Found specification of procedure initstate_r [2020-11-29 22:49:29,163 INFO L130 BoogieDeclarations]: Found specification of procedure setstate_r [2020-11-29 22:49:29,163 INFO L130 BoogieDeclarations]: Found specification of procedure rand [2020-11-29 22:49:29,163 INFO L130 BoogieDeclarations]: Found specification of procedure srand [2020-11-29 22:49:29,163 INFO L130 BoogieDeclarations]: Found specification of procedure rand_r [2020-11-29 22:49:29,164 INFO L130 BoogieDeclarations]: Found specification of procedure drand48 [2020-11-29 22:49:29,164 INFO L130 BoogieDeclarations]: Found specification of procedure erand48 [2020-11-29 22:49:29,164 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48 [2020-11-29 22:49:29,164 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48 [2020-11-29 22:49:29,164 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48 [2020-11-29 22:49:29,164 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48 [2020-11-29 22:49:29,165 INFO L130 BoogieDeclarations]: Found specification of procedure srand48 [2020-11-29 22:49:29,165 INFO L130 BoogieDeclarations]: Found specification of procedure seed48 [2020-11-29 22:49:29,165 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48 [2020-11-29 22:49:29,165 INFO L130 BoogieDeclarations]: Found specification of procedure drand48_r [2020-11-29 22:49:29,165 INFO L130 BoogieDeclarations]: Found specification of procedure erand48_r [2020-11-29 22:49:29,165 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48_r [2020-11-29 22:49:29,166 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48_r [2020-11-29 22:49:29,166 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48_r [2020-11-29 22:49:29,166 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48_r [2020-11-29 22:49:29,166 INFO L130 BoogieDeclarations]: Found specification of procedure srand48_r [2020-11-29 22:49:29,166 INFO L130 BoogieDeclarations]: Found specification of procedure seed48_r [2020-11-29 22:49:29,167 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48_r [2020-11-29 22:49:29,167 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-11-29 22:49:29,167 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2020-11-29 22:49:29,167 INFO L130 BoogieDeclarations]: Found specification of procedure realloc [2020-11-29 22:49:29,167 INFO L130 BoogieDeclarations]: Found specification of procedure free [2020-11-29 22:49:29,167 INFO L130 BoogieDeclarations]: Found specification of procedure alloca [2020-11-29 22:49:29,168 INFO L130 BoogieDeclarations]: Found specification of procedure valloc [2020-11-29 22:49:29,168 INFO L130 BoogieDeclarations]: Found specification of procedure posix_memalign [2020-11-29 22:49:29,168 INFO L130 BoogieDeclarations]: Found specification of procedure aligned_alloc [2020-11-29 22:49:29,168 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-11-29 22:49:29,168 INFO L130 BoogieDeclarations]: Found specification of procedure atexit [2020-11-29 22:49:29,168 INFO L130 BoogieDeclarations]: Found specification of procedure at_quick_exit [2020-11-29 22:49:29,169 INFO L130 BoogieDeclarations]: Found specification of procedure on_exit [2020-11-29 22:49:29,169 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2020-11-29 22:49:29,169 INFO L130 BoogieDeclarations]: Found specification of procedure quick_exit [2020-11-29 22:49:29,169 INFO L130 BoogieDeclarations]: Found specification of procedure _Exit [2020-11-29 22:49:29,169 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2020-11-29 22:49:29,169 INFO L130 BoogieDeclarations]: Found specification of procedure putenv [2020-11-29 22:49:29,170 INFO L130 BoogieDeclarations]: Found specification of procedure setenv [2020-11-29 22:49:29,170 INFO L130 BoogieDeclarations]: Found specification of procedure unsetenv [2020-11-29 22:49:29,170 INFO L130 BoogieDeclarations]: Found specification of procedure clearenv [2020-11-29 22:49:29,170 INFO L130 BoogieDeclarations]: Found specification of procedure mktemp [2020-11-29 22:49:29,170 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemp [2020-11-29 22:49:29,170 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemps [2020-11-29 22:49:29,171 INFO L130 BoogieDeclarations]: Found specification of procedure mkdtemp [2020-11-29 22:49:29,171 INFO L130 BoogieDeclarations]: Found specification of procedure system [2020-11-29 22:49:29,171 INFO L130 BoogieDeclarations]: Found specification of procedure realpath [2020-11-29 22:49:29,171 INFO L130 BoogieDeclarations]: Found specification of procedure bsearch [2020-11-29 22:49:29,171 INFO L130 BoogieDeclarations]: Found specification of procedure qsort [2020-11-29 22:49:29,171 INFO L130 BoogieDeclarations]: Found specification of procedure abs [2020-11-29 22:49:29,172 INFO L130 BoogieDeclarations]: Found specification of procedure labs [2020-11-29 22:49:29,172 INFO L130 BoogieDeclarations]: Found specification of procedure llabs [2020-11-29 22:49:29,172 INFO L130 BoogieDeclarations]: Found specification of procedure div [2020-11-29 22:49:29,172 INFO L130 BoogieDeclarations]: Found specification of procedure ldiv [2020-11-29 22:49:29,172 INFO L130 BoogieDeclarations]: Found specification of procedure lldiv [2020-11-29 22:49:29,172 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt [2020-11-29 22:49:29,172 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt [2020-11-29 22:49:29,173 INFO L130 BoogieDeclarations]: Found specification of procedure gcvt [2020-11-29 22:49:29,173 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt [2020-11-29 22:49:29,173 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt [2020-11-29 22:49:29,173 INFO L130 BoogieDeclarations]: Found specification of procedure qgcvt [2020-11-29 22:49:29,173 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt_r [2020-11-29 22:49:29,173 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt_r [2020-11-29 22:49:29,174 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt_r [2020-11-29 22:49:29,174 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt_r [2020-11-29 22:49:29,174 INFO L130 BoogieDeclarations]: Found specification of procedure mblen [2020-11-29 22:49:29,174 INFO L130 BoogieDeclarations]: Found specification of procedure mbtowc [2020-11-29 22:49:29,174 INFO L130 BoogieDeclarations]: Found specification of procedure wctomb [2020-11-29 22:49:29,174 INFO L130 BoogieDeclarations]: Found specification of procedure mbstowcs [2020-11-29 22:49:29,175 INFO L130 BoogieDeclarations]: Found specification of procedure wcstombs [2020-11-29 22:49:29,175 INFO L130 BoogieDeclarations]: Found specification of procedure rpmatch [2020-11-29 22:49:29,175 INFO L130 BoogieDeclarations]: Found specification of procedure getsubopt [2020-11-29 22:49:29,175 INFO L130 BoogieDeclarations]: Found specification of procedure getloadavg [2020-11-29 22:49:29,175 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-11-29 22:49:29,176 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-11-29 22:49:29,176 INFO L130 BoogieDeclarations]: Found specification of procedure strlen_rec [2020-11-29 22:49:29,176 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-11-29 22:49:29,176 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-11-29 22:49:29,176 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-29 22:49:29,176 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-11-29 22:49:29,176 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-11-29 22:49:29,177 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-11-29 22:49:29,177 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-29 22:49:29,762 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-29 22:49:29,763 INFO L298 CfgBuilder]: Removed 1 assume(true) statements. [2020-11-29 22:49:29,764 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 29.11 10:49:29 BoogieIcfgContainer [2020-11-29 22:49:29,764 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-29 22:49:29,766 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-29 22:49:29,766 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-29 22:49:29,770 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-29 22:49:29,770 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 29.11 10:49:28" (1/3) ... [2020-11-29 22:49:29,771 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@22363b3b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 29.11 10:49:29, skipping insertion in model container [2020-11-29 22:49:29,772 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 10:49:29" (2/3) ... [2020-11-29 22:49:29,772 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@22363b3b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 29.11 10:49:29, skipping insertion in model container [2020-11-29 22:49:29,772 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 29.11 10:49:29" (3/3) ... [2020-11-29 22:49:29,774 INFO L111 eAbstractionObserver]: Analyzing ICFG rec_strlen-alloca-1.i [2020-11-29 22:49:29,785 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-29 22:49:29,789 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 7 error locations. [2020-11-29 22:49:29,801 INFO L253 AbstractCegarLoop]: Starting to check reachability of 7 error locations. [2020-11-29 22:49:29,821 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-29 22:49:29,821 INFO L378 AbstractCegarLoop]: Hoare is false [2020-11-29 22:49:29,821 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-29 22:49:29,821 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-29 22:49:29,822 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-29 22:49:29,822 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-29 22:49:29,822 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-29 22:49:29,822 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-29 22:49:29,835 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-11-29 22:49:29,842 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-11-29 22:49:29,842 INFO L414 BasicCegarLoop]: Found error trace [2020-11-29 22:49:29,843 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-29 22:49:29,843 INFO L429 AbstractCegarLoop]: === Iteration 1 === [mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, strlen_recErr1REQUIRES_VIOLATION, strlen_recErr0REQUIRES_VIOLATION]=== [2020-11-29 22:49:29,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 22:49:29,849 INFO L82 PathProgramCache]: Analyzing trace with hash -2117754822, now seen corresponding path program 1 times [2020-11-29 22:49:29,857 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 22:49:29,858 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1411758337] [2020-11-29 22:49:29,858 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 22:49:29,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 22:49:30,027 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-29 22:49:30,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 22:49:30,038 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 22:49:30,039 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1411758337] [2020-11-29 22:49:30,040 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-29 22:49:30,040 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-11-29 22:49:30,041 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1607033999] [2020-11-29 22:49:30,045 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-11-29 22:49:30,045 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-29 22:49:30,058 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-11-29 22:49:30,059 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-11-29 22:49:30,061 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 4 states. [2020-11-29 22:49:30,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-29 22:49:30,201 INFO L93 Difference]: Finished difference Result 31 states and 34 transitions. [2020-11-29 22:49:30,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-11-29 22:49:30,203 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 10 [2020-11-29 22:49:30,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-29 22:49:30,210 INFO L225 Difference]: With dead ends: 31 [2020-11-29 22:49:30,210 INFO L226 Difference]: Without dead ends: 28 [2020-11-29 22:49:30,211 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-11-29 22:49:30,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-11-29 22:49:30,242 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-11-29 22:49:30,243 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-11-29 22:49:30,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2020-11-29 22:49:30,246 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 10 [2020-11-29 22:49:30,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-29 22:49:30,247 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2020-11-29 22:49:30,247 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-11-29 22:49:30,247 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2020-11-29 22:49:30,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-11-29 22:49:30,248 INFO L414 BasicCegarLoop]: Found error trace [2020-11-29 22:49:30,248 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-29 22:49:30,248 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-29 22:49:30,248 INFO L429 AbstractCegarLoop]: === Iteration 2 === [mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, strlen_recErr1REQUIRES_VIOLATION, strlen_recErr0REQUIRES_VIOLATION]=== [2020-11-29 22:49:30,249 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 22:49:30,249 INFO L82 PathProgramCache]: Analyzing trace with hash -2117754821, now seen corresponding path program 1 times [2020-11-29 22:49:30,263 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 22:49:30,263 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [435305955] [2020-11-29 22:49:30,263 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 22:49:30,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 22:49:30,365 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-29 22:49:30,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 22:49:30,379 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 22:49:30,381 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [435305955] [2020-11-29 22:49:30,381 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-29 22:49:30,381 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-11-29 22:49:30,382 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [945277594] [2020-11-29 22:49:30,383 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-11-29 22:49:30,384 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-29 22:49:30,385 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-11-29 22:49:30,386 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-11-29 22:49:30,386 INFO L87 Difference]: Start difference. First operand 28 states and 31 transitions. Second operand 5 states. [2020-11-29 22:49:30,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-29 22:49:30,495 INFO L93 Difference]: Finished difference Result 27 states and 30 transitions. [2020-11-29 22:49:30,496 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-11-29 22:49:30,496 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 10 [2020-11-29 22:49:30,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-29 22:49:30,497 INFO L225 Difference]: With dead ends: 27 [2020-11-29 22:49:30,497 INFO L226 Difference]: Without dead ends: 27 [2020-11-29 22:49:30,498 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-11-29 22:49:30,498 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-11-29 22:49:30,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-11-29 22:49:30,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-11-29 22:49:30,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 30 transitions. [2020-11-29 22:49:30,502 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 30 transitions. Word has length 10 [2020-11-29 22:49:30,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-29 22:49:30,503 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 30 transitions. [2020-11-29 22:49:30,503 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-11-29 22:49:30,503 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 30 transitions. [2020-11-29 22:49:30,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-11-29 22:49:30,503 INFO L414 BasicCegarLoop]: Found error trace [2020-11-29 22:49:30,503 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-29 22:49:30,506 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-11-29 22:49:30,506 INFO L429 AbstractCegarLoop]: === Iteration 3 === [mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, strlen_recErr1REQUIRES_VIOLATION, strlen_recErr0REQUIRES_VIOLATION]=== [2020-11-29 22:49:30,509 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 22:49:30,510 INFO L82 PathProgramCache]: Analyzing trace with hash -2117754768, now seen corresponding path program 1 times [2020-11-29 22:49:30,510 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 22:49:30,510 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1250845011] [2020-11-29 22:49:30,511 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 22:49:30,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 22:49:30,600 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-29 22:49:30,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 22:49:30,607 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 22:49:30,607 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1250845011] [2020-11-29 22:49:30,607 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-29 22:49:30,613 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-11-29 22:49:30,613 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1411770081] [2020-11-29 22:49:30,613 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-11-29 22:49:30,614 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-29 22:49:30,615 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-11-29 22:49:30,616 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-11-29 22:49:30,616 INFO L87 Difference]: Start difference. First operand 27 states and 30 transitions. Second operand 5 states. [2020-11-29 22:49:30,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-29 22:49:30,719 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2020-11-29 22:49:30,721 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-11-29 22:49:30,722 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 10 [2020-11-29 22:49:30,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-29 22:49:30,723 INFO L225 Difference]: With dead ends: 34 [2020-11-29 22:49:30,723 INFO L226 Difference]: Without dead ends: 34 [2020-11-29 22:49:30,723 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-11-29 22:49:30,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-11-29 22:49:30,729 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 29. [2020-11-29 22:49:30,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-11-29 22:49:30,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2020-11-29 22:49:30,731 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 10 [2020-11-29 22:49:30,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-29 22:49:30,731 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2020-11-29 22:49:30,732 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-11-29 22:49:30,732 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2020-11-29 22:49:30,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-11-29 22:49:30,732 INFO L414 BasicCegarLoop]: Found error trace [2020-11-29 22:49:30,732 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-29 22:49:30,733 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-11-29 22:49:30,733 INFO L429 AbstractCegarLoop]: === Iteration 4 === [mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, strlen_recErr1REQUIRES_VIOLATION, strlen_recErr0REQUIRES_VIOLATION]=== [2020-11-29 22:49:30,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 22:49:30,733 INFO L82 PathProgramCache]: Analyzing trace with hash -2117695186, now seen corresponding path program 1 times [2020-11-29 22:49:30,734 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 22:49:30,734 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [961492870] [2020-11-29 22:49:30,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 22:49:30,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 22:49:30,823 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-29 22:49:30,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 22:49:30,829 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 22:49:30,829 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [961492870] [2020-11-29 22:49:30,829 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-29 22:49:30,830 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-11-29 22:49:30,830 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [406027196] [2020-11-29 22:49:30,830 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-11-29 22:49:30,830 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-29 22:49:30,831 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-11-29 22:49:30,831 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-11-29 22:49:30,831 INFO L87 Difference]: Start difference. First operand 29 states and 32 transitions. Second operand 5 states. [2020-11-29 22:49:30,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-29 22:49:30,970 INFO L93 Difference]: Finished difference Result 38 states and 42 transitions. [2020-11-29 22:49:30,971 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-29 22:49:30,971 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 10 [2020-11-29 22:49:30,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-29 22:49:30,972 INFO L225 Difference]: With dead ends: 38 [2020-11-29 22:49:30,973 INFO L226 Difference]: Without dead ends: 38 [2020-11-29 22:49:30,973 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-11-29 22:49:30,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-11-29 22:49:30,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2020-11-29 22:49:30,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-11-29 22:49:30,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2020-11-29 22:49:30,978 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 10 [2020-11-29 22:49:30,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-29 22:49:30,979 INFO L481 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2020-11-29 22:49:30,979 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-11-29 22:49:30,979 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2020-11-29 22:49:30,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-11-29 22:49:30,982 INFO L414 BasicCegarLoop]: Found error trace [2020-11-29 22:49:30,982 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-29 22:49:30,982 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-11-29 22:49:30,983 INFO L429 AbstractCegarLoop]: === Iteration 5 === [mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, strlen_recErr1REQUIRES_VIOLATION, strlen_recErr0REQUIRES_VIOLATION]=== [2020-11-29 22:49:30,983 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 22:49:30,983 INFO L82 PathProgramCache]: Analyzing trace with hash -1259263901, now seen corresponding path program 1 times [2020-11-29 22:49:30,984 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 22:49:30,984 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1726180356] [2020-11-29 22:49:30,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 22:49:31,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 22:49:31,058 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-29 22:49:31,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 22:49:31,063 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 22:49:31,064 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1726180356] [2020-11-29 22:49:31,064 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-29 22:49:31,064 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-11-29 22:49:31,064 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [308167247] [2020-11-29 22:49:31,065 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-11-29 22:49:31,065 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-29 22:49:31,065 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-11-29 22:49:31,066 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-11-29 22:49:31,066 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 6 states. [2020-11-29 22:49:31,213 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-29 22:49:31,213 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2020-11-29 22:49:31,213 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-29 22:49:31,214 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2020-11-29 22:49:31,214 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-29 22:49:31,215 INFO L225 Difference]: With dead ends: 30 [2020-11-29 22:49:31,215 INFO L226 Difference]: Without dead ends: 30 [2020-11-29 22:49:31,215 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-11-29 22:49:31,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-11-29 22:49:31,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-11-29 22:49:31,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-11-29 22:49:31,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2020-11-29 22:49:31,219 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 13 [2020-11-29 22:49:31,223 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-29 22:49:31,223 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2020-11-29 22:49:31,223 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-11-29 22:49:31,224 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2020-11-29 22:49:31,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-11-29 22:49:31,225 INFO L414 BasicCegarLoop]: Found error trace [2020-11-29 22:49:31,225 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-29 22:49:31,226 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-11-29 22:49:31,226 INFO L429 AbstractCegarLoop]: === Iteration 6 === [mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, strlen_recErr1REQUIRES_VIOLATION, strlen_recErr0REQUIRES_VIOLATION]=== [2020-11-29 22:49:31,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 22:49:31,227 INFO L82 PathProgramCache]: Analyzing trace with hash -1259263900, now seen corresponding path program 1 times [2020-11-29 22:49:31,227 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 22:49:31,227 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1768099614] [2020-11-29 22:49:31,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 22:49:31,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 22:49:31,328 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-29 22:49:31,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 22:49:31,332 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 22:49:31,333 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1768099614] [2020-11-29 22:49:31,333 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-29 22:49:31,333 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-11-29 22:49:31,333 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1976988726] [2020-11-29 22:49:31,334 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-11-29 22:49:31,334 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-29 22:49:31,334 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-11-29 22:49:31,335 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-11-29 22:49:31,335 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand 7 states. [2020-11-29 22:49:31,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-29 22:49:31,550 INFO L93 Difference]: Finished difference Result 37 states and 42 transitions. [2020-11-29 22:49:31,550 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-11-29 22:49:31,550 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 13 [2020-11-29 22:49:31,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-29 22:49:31,551 INFO L225 Difference]: With dead ends: 37 [2020-11-29 22:49:31,551 INFO L226 Difference]: Without dead ends: 37 [2020-11-29 22:49:31,552 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2020-11-29 22:49:31,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-11-29 22:49:31,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-11-29 22:49:31,556 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-11-29 22:49:31,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 42 transitions. [2020-11-29 22:49:31,557 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 42 transitions. Word has length 13 [2020-11-29 22:49:31,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-29 22:49:31,557 INFO L481 AbstractCegarLoop]: Abstraction has 37 states and 42 transitions. [2020-11-29 22:49:31,558 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-11-29 22:49:31,558 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 42 transitions. [2020-11-29 22:49:31,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-11-29 22:49:31,558 INFO L414 BasicCegarLoop]: Found error trace [2020-11-29 22:49:31,559 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-29 22:49:31,559 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-11-29 22:49:31,559 INFO L429 AbstractCegarLoop]: === Iteration 7 === [mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, strlen_recErr1REQUIRES_VIOLATION, strlen_recErr0REQUIRES_VIOLATION]=== [2020-11-29 22:49:31,559 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 22:49:31,564 INFO L82 PathProgramCache]: Analyzing trace with hash -1143813903, now seen corresponding path program 1 times [2020-11-29 22:49:31,564 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 22:49:31,565 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [246417711] [2020-11-29 22:49:31,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 22:49:31,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 22:49:31,684 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-29 22:49:31,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 22:49:31,689 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 22:49:31,689 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [246417711] [2020-11-29 22:49:31,690 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [297320771] [2020-11-29 22:49:31,690 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_70a1d727-352c-4c96-bbb4-84721fb4bc9a/bin/uautomizer/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-29 22:49:31,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 22:49:31,820 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 11 conjunts are in the unsatisfiable core [2020-11-29 22:49:31,825 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 22:49:31,886 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2020-11-29 22:49:31,887 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-29 22:49:32,016 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-11-29 22:49:32,017 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-29 22:49:32,017 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2020-11-29 22:49:32,017 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:13, output treesize:12 [2020-11-29 22:49:32,102 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 22:49:32,102 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-29 22:49:32,103 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2020-11-29 22:49:32,103 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1128131049] [2020-11-29 22:49:32,103 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-11-29 22:49:32,103 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-29 22:49:32,124 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-11-29 22:49:32,124 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2020-11-29 22:49:32,124 INFO L87 Difference]: Start difference. First operand 37 states and 42 transitions. Second operand 7 states. [2020-11-29 22:49:32,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-29 22:49:32,271 INFO L93 Difference]: Finished difference Result 43 states and 48 transitions. [2020-11-29 22:49:32,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-29 22:49:32,272 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 14 [2020-11-29 22:49:32,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-29 22:49:32,273 INFO L225 Difference]: With dead ends: 43 [2020-11-29 22:49:32,274 INFO L226 Difference]: Without dead ends: 43 [2020-11-29 22:49:32,274 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-11-29 22:49:32,274 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-11-29 22:49:32,278 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 34. [2020-11-29 22:49:32,279 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-11-29 22:49:32,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 38 transitions. [2020-11-29 22:49:32,283 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 38 transitions. Word has length 14 [2020-11-29 22:49:32,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-29 22:49:32,284 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 38 transitions. [2020-11-29 22:49:32,284 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-11-29 22:49:32,284 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 38 transitions. [2020-11-29 22:49:32,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-11-29 22:49:32,285 INFO L414 BasicCegarLoop]: Found error trace [2020-11-29 22:49:32,286 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-29 22:49:32,486 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2020-11-29 22:49:32,486 INFO L429 AbstractCegarLoop]: === Iteration 8 === [mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, strlen_recErr1REQUIRES_VIOLATION, strlen_recErr0REQUIRES_VIOLATION]=== [2020-11-29 22:49:32,487 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 22:49:32,487 INFO L82 PathProgramCache]: Analyzing trace with hash 228211982, now seen corresponding path program 1 times [2020-11-29 22:49:32,487 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 22:49:32,487 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [935014282] [2020-11-29 22:49:32,487 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 22:49:32,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 22:49:32,672 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-29 22:49:32,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 22:49:32,677 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 22:49:32,677 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [935014282] [2020-11-29 22:49:32,677 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-29 22:49:32,677 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2020-11-29 22:49:32,677 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1934748957] [2020-11-29 22:49:32,678 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-11-29 22:49:32,678 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-29 22:49:32,678 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-11-29 22:49:32,679 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2020-11-29 22:49:32,679 INFO L87 Difference]: Start difference. First operand 34 states and 38 transitions. Second operand 9 states. [2020-11-29 22:49:32,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-29 22:49:32,928 INFO L93 Difference]: Finished difference Result 44 states and 47 transitions. [2020-11-29 22:49:32,929 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-11-29 22:49:32,929 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 17 [2020-11-29 22:49:32,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-29 22:49:32,930 INFO L225 Difference]: With dead ends: 44 [2020-11-29 22:49:32,930 INFO L226 Difference]: Without dead ends: 44 [2020-11-29 22:49:32,930 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=43, Invalid=139, Unknown=0, NotChecked=0, Total=182 [2020-11-29 22:49:32,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-11-29 22:49:32,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 41. [2020-11-29 22:49:32,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-11-29 22:49:32,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2020-11-29 22:49:32,939 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 17 [2020-11-29 22:49:32,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-29 22:49:32,940 INFO L481 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2020-11-29 22:49:32,940 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-11-29 22:49:32,940 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2020-11-29 22:49:32,940 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-11-29 22:49:32,941 INFO L414 BasicCegarLoop]: Found error trace [2020-11-29 22:49:32,941 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-29 22:49:32,941 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-11-29 22:49:32,941 INFO L429 AbstractCegarLoop]: === Iteration 9 === [mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, strlen_recErr1REQUIRES_VIOLATION, strlen_recErr0REQUIRES_VIOLATION]=== [2020-11-29 22:49:32,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 22:49:32,942 INFO L82 PathProgramCache]: Analyzing trace with hash 929276560, now seen corresponding path program 1 times [2020-11-29 22:49:32,942 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 22:49:32,942 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1530048837] [2020-11-29 22:49:32,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 22:49:32,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 22:49:33,126 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-29 22:49:33,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 22:49:33,129 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 22:49:33,129 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1530048837] [2020-11-29 22:49:33,129 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-29 22:49:33,129 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2020-11-29 22:49:33,130 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1491750460] [2020-11-29 22:49:33,130 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-11-29 22:49:33,130 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-29 22:49:33,131 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-11-29 22:49:33,131 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2020-11-29 22:49:33,131 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand 10 states. [2020-11-29 22:49:33,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-29 22:49:33,400 INFO L93 Difference]: Finished difference Result 55 states and 59 transitions. [2020-11-29 22:49:33,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-11-29 22:49:33,401 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 17 [2020-11-29 22:49:33,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-29 22:49:33,403 INFO L225 Difference]: With dead ends: 55 [2020-11-29 22:49:33,403 INFO L226 Difference]: Without dead ends: 55 [2020-11-29 22:49:33,404 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=53, Invalid=187, Unknown=0, NotChecked=0, Total=240 [2020-11-29 22:49:33,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-11-29 22:49:33,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 42. [2020-11-29 22:49:33,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-11-29 22:49:33,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 47 transitions. [2020-11-29 22:49:33,410 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 47 transitions. Word has length 17 [2020-11-29 22:49:33,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-29 22:49:33,410 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 47 transitions. [2020-11-29 22:49:33,410 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-11-29 22:49:33,410 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 47 transitions. [2020-11-29 22:49:33,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-11-29 22:49:33,411 INFO L414 BasicCegarLoop]: Found error trace [2020-11-29 22:49:33,411 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-29 22:49:33,411 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-11-29 22:49:33,411 INFO L429 AbstractCegarLoop]: === Iteration 10 === [mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, strlen_recErr1REQUIRES_VIOLATION, strlen_recErr0REQUIRES_VIOLATION]=== [2020-11-29 22:49:33,412 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 22:49:33,412 INFO L82 PathProgramCache]: Analyzing trace with hash -1516451273, now seen corresponding path program 1 times [2020-11-29 22:49:33,412 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 22:49:33,412 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [268428151] [2020-11-29 22:49:33,412 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 22:49:33,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 22:49:33,478 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-29 22:49:33,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 22:49:33,481 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-11-29 22:49:33,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 22:49:33,485 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 22:49:33,486 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [268428151] [2020-11-29 22:49:33,486 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-29 22:49:33,486 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-11-29 22:49:33,486 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [765368704] [2020-11-29 22:49:33,487 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-11-29 22:49:33,487 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-29 22:49:33,487 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-11-29 22:49:33,491 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-11-29 22:49:33,491 INFO L87 Difference]: Start difference. First operand 42 states and 47 transitions. Second operand 5 states. [2020-11-29 22:49:33,559 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-29 22:49:33,559 INFO L93 Difference]: Finished difference Result 41 states and 46 transitions. [2020-11-29 22:49:33,560 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-11-29 22:49:33,560 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 18 [2020-11-29 22:49:33,560 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-29 22:49:33,560 INFO L225 Difference]: With dead ends: 41 [2020-11-29 22:49:33,560 INFO L226 Difference]: Without dead ends: 24 [2020-11-29 22:49:33,561 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-11-29 22:49:33,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-11-29 22:49:33,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 22. [2020-11-29 22:49:33,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-11-29 22:49:33,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2020-11-29 22:49:33,563 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 18 [2020-11-29 22:49:33,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-29 22:49:33,564 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2020-11-29 22:49:33,564 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-11-29 22:49:33,564 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2020-11-29 22:49:33,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-11-29 22:49:33,564 INFO L414 BasicCegarLoop]: Found error trace [2020-11-29 22:49:33,565 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-29 22:49:33,565 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-11-29 22:49:33,565 INFO L429 AbstractCegarLoop]: === Iteration 11 === [mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, strlen_recErr1REQUIRES_VIOLATION, strlen_recErr0REQUIRES_VIOLATION]=== [2020-11-29 22:49:33,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 22:49:33,565 INFO L82 PathProgramCache]: Analyzing trace with hash 1650962797, now seen corresponding path program 1 times [2020-11-29 22:49:33,566 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 22:49:33,566 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [770642474] [2020-11-29 22:49:33,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 22:49:33,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 22:49:33,702 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-29 22:49:33,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 22:49:33,706 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 22:49:33,707 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [770642474] [2020-11-29 22:49:33,707 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2062192480] [2020-11-29 22:49:33,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_70a1d727-352c-4c96-bbb4-84721fb4bc9a/bin/uautomizer/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-29 22:49:33,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 22:49:33,836 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 21 conjunts are in the unsatisfiable core [2020-11-29 22:49:33,838 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 22:49:33,962 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 22:49:33,962 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-29 22:49:33,963 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 14 [2020-11-29 22:49:33,963 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [620279062] [2020-11-29 22:49:33,963 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-11-29 22:49:33,963 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-29 22:49:33,967 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-11-29 22:49:33,967 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=177, Unknown=0, NotChecked=0, Total=210 [2020-11-29 22:49:33,967 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand 15 states. [2020-11-29 22:49:34,244 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-29 22:49:34,244 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2020-11-29 22:49:34,244 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-11-29 22:49:34,245 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 21 [2020-11-29 22:49:34,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-29 22:49:34,245 INFO L225 Difference]: With dead ends: 31 [2020-11-29 22:49:34,245 INFO L226 Difference]: Without dead ends: 31 [2020-11-29 22:49:34,246 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=71, Invalid=349, Unknown=0, NotChecked=0, Total=420 [2020-11-29 22:49:34,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-11-29 22:49:34,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 26. [2020-11-29 22:49:34,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-11-29 22:49:34,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 27 transitions. [2020-11-29 22:49:34,249 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 27 transitions. Word has length 21 [2020-11-29 22:49:34,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-29 22:49:34,249 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 27 transitions. [2020-11-29 22:49:34,249 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-11-29 22:49:34,249 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 27 transitions. [2020-11-29 22:49:34,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-11-29 22:49:34,250 INFO L414 BasicCegarLoop]: Found error trace [2020-11-29 22:49:34,250 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-29 22:49:34,451 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-29 22:49:34,451 INFO L429 AbstractCegarLoop]: === Iteration 12 === [mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, strlen_recErr1REQUIRES_VIOLATION, strlen_recErr0REQUIRES_VIOLATION]=== [2020-11-29 22:49:34,451 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 22:49:34,451 INFO L82 PathProgramCache]: Analyzing trace with hash -1692198505, now seen corresponding path program 2 times [2020-11-29 22:49:34,452 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 22:49:34,452 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [936132500] [2020-11-29 22:49:34,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 22:49:34,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 22:49:34,784 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-29 22:49:34,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 22:49:34,790 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 5 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 22:49:34,790 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [936132500] [2020-11-29 22:49:34,790 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1943624372] [2020-11-29 22:49:34,791 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_70a1d727-352c-4c96-bbb4-84721fb4bc9a/bin/uautomizer/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-29 22:49:34,951 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-11-29 22:49:34,951 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-29 22:49:34,953 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 33 conjunts are in the unsatisfiable core [2020-11-29 22:49:34,959 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 22:49:35,028 INFO L384 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 14 treesize of output 10 [2020-11-29 22:49:35,028 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-29 22:49:35,038 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-29 22:49:35,040 INFO L545 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. [2020-11-29 22:49:35,040 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:21 [2020-11-29 22:49:35,487 INFO L350 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2020-11-29 22:49:35,487 INFO L384 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 18 treesize of output 18 [2020-11-29 22:49:35,488 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2020-11-29 22:49:35,507 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-29 22:49:35,510 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-11-29 22:49:35,514 INFO L603 QuantifierPusher]: Distributing 3 conjuncts over 2 disjuncts [2020-11-29 22:49:35,524 INFO L545 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-11-29 22:49:35,524 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:36, output treesize:27 [2020-11-29 22:49:35,610 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-29 22:49:35,816 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 22:49:35,817 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-29 22:49:35,817 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 25 [2020-11-29 22:49:35,817 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [677297250] [2020-11-29 22:49:35,818 INFO L461 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-11-29 22:49:35,820 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-29 22:49:35,821 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-11-29 22:49:35,821 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=544, Unknown=0, NotChecked=0, Total=600 [2020-11-29 22:49:35,822 INFO L87 Difference]: Start difference. First operand 26 states and 27 transitions. Second operand 25 states. [2020-11-29 22:49:37,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-29 22:49:37,266 INFO L93 Difference]: Finished difference Result 48 states and 49 transitions. [2020-11-29 22:49:37,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-11-29 22:49:37,267 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 25 [2020-11-29 22:49:37,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-29 22:49:37,267 INFO L225 Difference]: With dead ends: 48 [2020-11-29 22:49:37,268 INFO L226 Difference]: Without dead ends: 39 [2020-11-29 22:49:37,269 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 298 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=207, Invalid=1773, Unknown=0, NotChecked=0, Total=1980 [2020-11-29 22:49:37,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-11-29 22:49:37,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 34. [2020-11-29 22:49:37,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-11-29 22:49:37,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 35 transitions. [2020-11-29 22:49:37,271 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 35 transitions. Word has length 25 [2020-11-29 22:49:37,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-29 22:49:37,271 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 35 transitions. [2020-11-29 22:49:37,272 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-11-29 22:49:37,272 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 35 transitions. [2020-11-29 22:49:37,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-11-29 22:49:37,272 INFO L414 BasicCegarLoop]: Found error trace [2020-11-29 22:49:37,273 INFO L422 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-29 22:49:37,473 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2020-11-29 22:49:37,473 INFO L429 AbstractCegarLoop]: === Iteration 13 === [mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, strlen_recErr1REQUIRES_VIOLATION, strlen_recErr0REQUIRES_VIOLATION]=== [2020-11-29 22:49:37,474 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 22:49:37,474 INFO L82 PathProgramCache]: Analyzing trace with hash -1867118562, now seen corresponding path program 3 times [2020-11-29 22:49:37,474 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 22:49:37,474 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1525073702] [2020-11-29 22:49:37,474 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 22:49:37,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 22:49:37,744 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-29 22:49:37,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 22:49:37,751 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 8 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 22:49:37,751 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1525073702] [2020-11-29 22:49:37,751 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1647548069] [2020-11-29 22:49:37,751 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_70a1d727-352c-4c96-bbb4-84721fb4bc9a/bin/uautomizer/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-29 22:49:37,917 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2020-11-29 22:49:37,918 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-29 22:49:37,919 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 37 conjunts are in the unsatisfiable core [2020-11-29 22:49:37,924 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 22:49:38,112 INFO L384 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 14 treesize of output 10 [2020-11-29 22:49:38,112 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-29 22:49:38,124 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-29 22:49:38,126 INFO L545 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. [2020-11-29 22:49:38,126 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:21, output treesize:17 [2020-11-29 22:49:38,331 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2020-11-29 22:49:38,331 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-29 22:49:38,334 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-29 22:49:38,334 INFO L545 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-11-29 22:49:38,334 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:15, output treesize:3 [2020-11-29 22:49:38,338 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 8 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 22:49:38,338 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-29 22:49:38,338 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 24 [2020-11-29 22:49:38,339 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [997852411] [2020-11-29 22:49:38,339 INFO L461 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-11-29 22:49:38,339 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-29 22:49:38,340 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-11-29 22:49:38,340 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=496, Unknown=0, NotChecked=0, Total=552 [2020-11-29 22:49:38,341 INFO L87 Difference]: Start difference. First operand 34 states and 35 transitions. Second operand 24 states. [2020-11-29 22:49:38,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-29 22:49:38,941 INFO L93 Difference]: Finished difference Result 54 states and 55 transitions. [2020-11-29 22:49:38,941 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-11-29 22:49:38,941 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 33 [2020-11-29 22:49:38,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-29 22:49:38,942 INFO L225 Difference]: With dead ends: 54 [2020-11-29 22:49:38,942 INFO L226 Difference]: Without dead ends: 41 [2020-11-29 22:49:38,943 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=120, Invalid=1002, Unknown=0, NotChecked=0, Total=1122 [2020-11-29 22:49:38,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-11-29 22:49:38,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 38. [2020-11-29 22:49:38,945 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-11-29 22:49:38,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 39 transitions. [2020-11-29 22:49:38,946 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 39 transitions. Word has length 33 [2020-11-29 22:49:38,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-29 22:49:38,946 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 39 transitions. [2020-11-29 22:49:38,947 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-11-29 22:49:38,947 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 39 transitions. [2020-11-29 22:49:38,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-11-29 22:49:38,948 INFO L414 BasicCegarLoop]: Found error trace [2020-11-29 22:49:38,948 INFO L422 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-29 22:49:39,160 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-29 22:49:39,160 INFO L429 AbstractCegarLoop]: === Iteration 14 === [mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, strlen_recErr1REQUIRES_VIOLATION, strlen_recErr0REQUIRES_VIOLATION]=== [2020-11-29 22:49:39,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 22:49:39,160 INFO L82 PathProgramCache]: Analyzing trace with hash 545438971, now seen corresponding path program 4 times [2020-11-29 22:49:39,161 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 22:49:39,161 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1084526887] [2020-11-29 22:49:39,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 22:49:39,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 22:49:39,511 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-29 22:49:39,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 22:49:39,518 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 1 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 22:49:39,518 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1084526887] [2020-11-29 22:49:39,518 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1138627900] [2020-11-29 22:49:39,518 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_70a1d727-352c-4c96-bbb4-84721fb4bc9a/bin/uautomizer/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-29 22:49:39,658 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-11-29 22:49:39,659 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-29 22:49:39,662 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 47 conjunts are in the unsatisfiable core [2020-11-29 22:49:39,667 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 22:49:39,675 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2020-11-29 22:49:39,675 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-29 22:49:39,683 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-29 22:49:39,683 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2020-11-29 22:49:39,684 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:13, output treesize:12 [2020-11-29 22:49:39,781 INFO L384 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 [2020-11-29 22:49:39,781 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-29 22:49:39,793 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-29 22:49:39,793 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-11-29 22:49:39,793 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:27, output treesize:23 [2020-11-29 22:49:40,150 INFO L350 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2020-11-29 22:49:40,150 INFO L384 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 19 [2020-11-29 22:49:40,151 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2020-11-29 22:49:40,160 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-29 22:49:40,161 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-11-29 22:49:40,161 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:30, output treesize:24 [2020-11-29 22:49:40,224 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-29 22:49:40,361 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 8 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 22:49:40,361 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-29 22:49:40,362 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17] total 28 [2020-11-29 22:49:40,362 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [192949360] [2020-11-29 22:49:40,362 INFO L461 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-11-29 22:49:40,362 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-29 22:49:40,363 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-11-29 22:49:40,364 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=748, Unknown=0, NotChecked=0, Total=812 [2020-11-29 22:49:40,364 INFO L87 Difference]: Start difference. First operand 38 states and 39 transitions. Second operand 29 states. [2020-11-29 22:49:41,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-29 22:49:41,378 INFO L93 Difference]: Finished difference Result 44 states and 45 transitions. [2020-11-29 22:49:41,379 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-11-29 22:49:41,379 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 37 [2020-11-29 22:49:41,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-29 22:49:41,380 INFO L225 Difference]: With dead ends: 44 [2020-11-29 22:49:41,380 INFO L226 Difference]: Without dead ends: 44 [2020-11-29 22:49:41,381 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 156 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=151, Invalid=1489, Unknown=0, NotChecked=0, Total=1640 [2020-11-29 22:49:41,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-11-29 22:49:41,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 42. [2020-11-29 22:49:41,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-11-29 22:49:41,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2020-11-29 22:49:41,384 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 37 [2020-11-29 22:49:41,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-29 22:49:41,385 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2020-11-29 22:49:41,385 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-11-29 22:49:41,385 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2020-11-29 22:49:41,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-11-29 22:49:41,386 INFO L414 BasicCegarLoop]: Found error trace [2020-11-29 22:49:41,386 INFO L422 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-29 22:49:41,586 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2020-11-29 22:49:41,587 INFO L429 AbstractCegarLoop]: === Iteration 15 === [mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, strlen_recErr1REQUIRES_VIOLATION, strlen_recErr0REQUIRES_VIOLATION]=== [2020-11-29 22:49:41,587 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 22:49:41,587 INFO L82 PathProgramCache]: Analyzing trace with hash 1989258789, now seen corresponding path program 5 times [2020-11-29 22:49:41,587 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 22:49:41,588 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2094118051] [2020-11-29 22:49:41,588 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 22:49:41,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 22:49:42,014 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-29 22:49:42,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 22:49:42,021 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 11 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 22:49:42,021 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2094118051] [2020-11-29 22:49:42,021 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1100853992] [2020-11-29 22:49:42,021 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_70a1d727-352c-4c96-bbb4-84721fb4bc9a/bin/uautomizer/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-29 22:49:42,148 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2020-11-29 22:49:42,148 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-29 22:49:42,150 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 56 conjunts are in the unsatisfiable core [2020-11-29 22:49:42,168 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 22:49:42,186 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2020-11-29 22:49:42,186 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-29 22:49:42,194 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-29 22:49:42,194 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2020-11-29 22:49:42,195 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:13, output treesize:12 [2020-11-29 22:49:42,357 INFO L384 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 [2020-11-29 22:49:42,357 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-29 22:49:42,367 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-29 22:49:42,368 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-11-29 22:49:42,368 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:21 [2020-11-29 22:49:42,791 INFO L350 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2020-11-29 22:49:42,791 INFO L384 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 19 [2020-11-29 22:49:42,792 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2020-11-29 22:49:42,809 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-29 22:49:42,809 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-11-29 22:49:42,809 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:27, output treesize:21 [2020-11-29 22:49:42,861 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-29 22:49:43,005 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 6 proven. 41 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 22:49:43,005 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-29 22:49:43,006 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 36 [2020-11-29 22:49:43,006 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1186572515] [2020-11-29 22:49:43,006 INFO L461 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-11-29 22:49:43,006 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-29 22:49:43,007 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-11-29 22:49:43,007 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=1186, Unknown=0, NotChecked=0, Total=1260 [2020-11-29 22:49:43,008 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand 36 states. [2020-11-29 22:49:45,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-29 22:49:45,200 INFO L93 Difference]: Finished difference Result 72 states and 73 transitions. [2020-11-29 22:49:45,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-11-29 22:49:45,200 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 41 [2020-11-29 22:49:45,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-29 22:49:45,201 INFO L225 Difference]: With dead ends: 72 [2020-11-29 22:49:45,201 INFO L226 Difference]: Without dead ends: 55 [2020-11-29 22:49:45,203 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 551 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=293, Invalid=3997, Unknown=0, NotChecked=0, Total=4290 [2020-11-29 22:49:45,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-11-29 22:49:45,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 50. [2020-11-29 22:49:45,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-11-29 22:49:45,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 51 transitions. [2020-11-29 22:49:45,207 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 51 transitions. Word has length 41 [2020-11-29 22:49:45,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-29 22:49:45,208 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 51 transitions. [2020-11-29 22:49:45,208 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-11-29 22:49:45,208 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 51 transitions. [2020-11-29 22:49:45,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-11-29 22:49:45,209 INFO L414 BasicCegarLoop]: Found error trace [2020-11-29 22:49:45,210 INFO L422 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-29 22:49:45,420 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-29 22:49:45,420 INFO L429 AbstractCegarLoop]: === Iteration 16 === [mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, strlen_recErr1REQUIRES_VIOLATION, strlen_recErr0REQUIRES_VIOLATION]=== [2020-11-29 22:49:45,421 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-29 22:49:45,421 INFO L82 PathProgramCache]: Analyzing trace with hash -1584706644, now seen corresponding path program 6 times [2020-11-29 22:49:45,421 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-29 22:49:45,421 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [289610093] [2020-11-29 22:49:45,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-29 22:49:45,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 22:49:45,824 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-29 22:49:45,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-29 22:49:45,830 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 14 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-29 22:49:45,830 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [289610093] [2020-11-29 22:49:45,830 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [431676886] [2020-11-29 22:49:45,831 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_70a1d727-352c-4c96-bbb4-84721fb4bc9a/bin/uautomizer/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-29 22:49:45,958 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2020-11-29 22:49:45,958 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-29 22:49:45,959 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 41 conjunts are in the unsatisfiable core [2020-11-29 22:49:45,962 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-29 22:49:45,986 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2020-11-29 22:49:45,987 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-29 22:49:45,992 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-29 22:49:45,993 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2020-11-29 22:49:45,993 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:10, output treesize:9 [2020-11-29 22:49:46,044 INFO L384 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 [2020-11-29 22:49:46,044 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-29 22:49:46,056 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-29 22:49:46,057 INFO L545 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. [2020-11-29 22:49:46,057 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:23, output treesize:19 [2020-11-29 22:49:46,360 INFO L350 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2020-11-29 22:49:46,361 INFO L384 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 20 treesize of output 20 [2020-11-29 22:49:46,361 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2020-11-29 22:49:46,379 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-29 22:49:46,380 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-11-29 22:49:46,383 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-11-29 22:49:46,383 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:36, output treesize:29 [2020-11-29 22:49:46,437 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-29 22:49:46,578 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2020-11-29 22:49:46,578 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-29 22:49:46,578 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 9] total 30 [2020-11-29 22:49:46,579 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1394543495] [2020-11-29 22:49:46,579 INFO L461 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-11-29 22:49:46,579 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-29 22:49:46,580 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-11-29 22:49:46,580 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=811, Unknown=0, NotChecked=0, Total=870 [2020-11-29 22:49:46,580 INFO L87 Difference]: Start difference. First operand 50 states and 51 transitions. Second operand 30 states. [2020-11-29 22:49:49,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-29 22:49:49,322 INFO L93 Difference]: Finished difference Result 77 states and 78 transitions. [2020-11-29 22:49:49,322 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-11-29 22:49:49,323 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 49 [2020-11-29 22:49:49,323 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-29 22:49:49,323 INFO L225 Difference]: With dead ends: 77 [2020-11-29 22:49:49,323 INFO L226 Difference]: Without dead ends: 0 [2020-11-29 22:49:49,325 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 594 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=452, Invalid=3838, Unknown=0, NotChecked=0, Total=4290 [2020-11-29 22:49:49,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-11-29 22:49:49,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-11-29 22:49:49,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-11-29 22:49:49,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-11-29 22:49:49,326 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 49 [2020-11-29 22:49:49,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-29 22:49:49,326 INFO L481 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-11-29 22:49:49,326 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-11-29 22:49:49,326 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-11-29 22:49:49,327 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-11-29 22:49:49,537 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2020-11-29 22:49:49,541 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 29.11 10:49:49 BoogieIcfgContainer [2020-11-29 22:49:49,541 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-29 22:49:49,542 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-11-29 22:49:49,542 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-11-29 22:49:49,542 INFO L275 PluginConnector]: Witness Printer initialized [2020-11-29 22:49:49,543 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 29.11 10:49:29" (3/4) ... [2020-11-29 22:49:49,547 INFO L137 WitnessPrinter]: Generating witness for correct program [2020-11-29 22:49:49,555 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure ULTIMATE.init [2020-11-29 22:49:49,556 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure __bswap_32 [2020-11-29 22:49:49,556 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure __bswap_64 [2020-11-29 22:49:49,556 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure __uint16_identity [2020-11-29 22:49:49,556 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure __uint64_identity [2020-11-29 22:49:49,557 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure main [2020-11-29 22:49:49,557 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure strlen_rec [2020-11-29 22:49:49,557 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure __uint32_identity [2020-11-29 22:49:49,565 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 12 nodes and edges [2020-11-29 22:49:49,566 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 4 nodes and edges [2020-11-29 22:49:49,566 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 2 nodes and edges [2020-11-29 22:49:49,566 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2020-11-29 22:49:49,605 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_70a1d727-352c-4c96-bbb4-84721fb4bc9a/bin/uautomizer/witness.graphml [2020-11-29 22:49:49,605 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-11-29 22:49:49,606 INFO L168 Benchmark]: Toolchain (without parser) took 21097.52 ms. Allocated memory was 94.4 MB in the beginning and 237.0 MB in the end (delta: 142.6 MB). Free memory was 62.6 MB in the beginning and 204.9 MB in the end (delta: -142.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 16.1 GB. [2020-11-29 22:49:49,607 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 94.4 MB. Free memory was 53.1 MB in the beginning and 53.1 MB in the end (delta: 35.5 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-29 22:49:49,607 INFO L168 Benchmark]: CACSL2BoogieTranslator took 519.09 ms. Allocated memory is still 94.4 MB. Free memory was 62.3 MB in the beginning and 61.4 MB in the end (delta: 898.9 kB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2020-11-29 22:49:49,607 INFO L168 Benchmark]: Boogie Preprocessor took 60.87 ms. Allocated memory is still 94.4 MB. Free memory was 61.4 MB in the beginning and 59.0 MB in the end (delta: 2.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-29 22:49:49,608 INFO L168 Benchmark]: RCFGBuilder took 673.42 ms. Allocated memory was 94.4 MB in the beginning and 113.2 MB in the end (delta: 18.9 MB). Free memory was 59.0 MB in the beginning and 78.6 MB in the end (delta: -19.6 MB). Peak memory consumption was 29.4 MB. Max. memory is 16.1 GB. [2020-11-29 22:49:49,609 INFO L168 Benchmark]: TraceAbstraction took 19775.00 ms. Allocated memory was 113.2 MB in the beginning and 237.0 MB in the end (delta: 123.7 MB). Free memory was 78.1 MB in the beginning and 208.5 MB in the end (delta: -130.5 MB). Peak memory consumption was 131.0 MB. Max. memory is 16.1 GB. [2020-11-29 22:49:49,609 INFO L168 Benchmark]: Witness Printer took 63.47 ms. Allocated memory is still 237.0 MB. Free memory was 208.5 MB in the beginning and 204.9 MB in the end (delta: 3.7 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. [2020-11-29 22:49:49,611 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23 ms. Allocated memory is still 94.4 MB. Free memory was 53.1 MB in the beginning and 53.1 MB in the end (delta: 35.5 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 519.09 ms. Allocated memory is still 94.4 MB. Free memory was 62.3 MB in the beginning and 61.4 MB in the end (delta: 898.9 kB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 60.87 ms. Allocated memory is still 94.4 MB. Free memory was 61.4 MB in the beginning and 59.0 MB in the end (delta: 2.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 673.42 ms. Allocated memory was 94.4 MB in the beginning and 113.2 MB in the end (delta: 18.9 MB). Free memory was 59.0 MB in the beginning and 78.6 MB in the end (delta: -19.6 MB). Peak memory consumption was 29.4 MB. Max. memory is 16.1 GB. * TraceAbstraction took 19775.00 ms. Allocated memory was 113.2 MB in the beginning and 237.0 MB in the end (delta: 123.7 MB). Free memory was 78.1 MB in the beginning and 208.5 MB in the end (delta: -130.5 MB). Peak memory consumption was 131.0 MB. Max. memory is 16.1 GB. * Witness Printer took 63.47 ms. Allocated memory is still 237.0 MB. Free memory was 208.5 MB in the beginning and 204.9 MB in the end (delta: 3.7 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 532]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 532]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 520]: all allocated memory was freed For all program executions holds that all allocated memory was freed at this location - PositiveResult [Line: 529]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 529]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 515]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 515]: 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, 48 locations, 7 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 19.7s, OverallIterations: 16, TraceHistogramMax: 6, AutomataDifference: 9.9s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 299 SDtfs, 652 SDslu, 1066 SDs, 0 SdLazy, 4392 SolverSat, 181 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 3.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 515 GetRequests, 185 SyntacticMatches, 4 SemanticMatches, 326 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1786 ImplicationChecksByTransitivity, 10.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=50occurred in iteration=15, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 16 MinimizatonAttempts, 59 StatesRemovedByMinimization, 11 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.4s SatisfiabilityAnalysisTime, 6.6s InterpolantComputationTime, 558 NumberOfCodeBlocks, 554 NumberOfCodeBlocksAsserted, 36 NumberOfCheckSat, 535 ConstructedInterpolants, 31 QuantifiedInterpolants, 147477 SizeOfPredicates, 72 NumberOfNonLiveVariables, 893 ConjunctsInSsa, 246 ConjunctsInUnsatCore, 23 InterpolantComputations, 9 PerfectInterpolantSequences, 126/396 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...