./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_d3fe285b-1e29-4e9f-bebc-2a5cb69e71de/bin/uautomizer/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_d3fe285b-1e29-4e9f-bebc-2a5cb69e71de/bin/uautomizer/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_d3fe285b-1e29-4e9f-bebc-2a5cb69e71de/bin/uautomizer/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_d3fe285b-1e29-4e9f-bebc-2a5cb69e71de/bin/uautomizer/config/AutomizerMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/rec_strlen-alloca-1.i -s /tmp/vcloud-vcloud-master/worker/run_dir_d3fe285b-1e29-4e9f-bebc-2a5cb69e71de/bin/uautomizer/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_d3fe285b-1e29-4e9f-bebc-2a5cb69e71de/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 [2020-11-28 03:20:28,599 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-28 03:20:28,601 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-28 03:20:28,665 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-28 03:20:28,666 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-28 03:20:28,667 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-28 03:20:28,669 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-28 03:20:28,672 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-28 03:20:28,675 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-28 03:20:28,676 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-28 03:20:28,677 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-28 03:20:28,678 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-28 03:20:28,679 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-28 03:20:28,680 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-28 03:20:28,681 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-28 03:20:28,683 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-28 03:20:28,684 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-28 03:20:28,685 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-28 03:20:28,687 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-28 03:20:28,689 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-28 03:20:28,691 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-28 03:20:28,693 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-28 03:20:28,694 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-28 03:20:28,695 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-28 03:20:28,699 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-11-28 03:20:28,700 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-11-28 03:20:28,700 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-11-28 03:20:28,701 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-11-28 03:20:28,702 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-11-28 03:20:28,703 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-11-28 03:20:28,703 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-11-28 03:20:28,704 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-11-28 03:20:28,705 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-11-28 03:20:28,706 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-11-28 03:20:28,708 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-11-28 03:20:28,708 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-11-28 03:20:28,709 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-11-28 03:20:28,709 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-11-28 03:20:28,710 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-28 03:20:28,711 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-28 03:20:28,712 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-28 03:20:28,713 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_d3fe285b-1e29-4e9f-bebc-2a5cb69e71de/bin/uautomizer/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2020-11-28 03:20:28,736 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-28 03:20:28,736 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-28 03:20:28,737 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-11-28 03:20:28,738 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-11-28 03:20:28,738 INFO L138 SettingsManager]: * Use SBE=true [2020-11-28 03:20:28,738 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-28 03:20:28,739 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-28 03:20:28,739 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2020-11-28 03:20:28,739 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-28 03:20:28,740 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-28 03:20:28,740 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-28 03:20:28,740 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2020-11-28 03:20:28,741 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2020-11-28 03:20:28,741 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2020-11-28 03:20:28,741 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-28 03:20:28,742 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-11-28 03:20:28,742 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-28 03:20:28,742 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-28 03:20:28,743 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-28 03:20:28,743 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-11-28 03:20:28,743 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-28 03:20:28,744 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-28 03:20:28,744 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-28 03:20:28,745 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-28 03:20:28,745 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-11-28 03:20:28,745 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-11-28 03:20:28,745 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-11-28 03:20:28,746 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-28 03:20:28,746 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_d3fe285b-1e29-4e9f-bebc-2a5cb69e71de/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_d3fe285b-1e29-4e9f-bebc-2a5cb69e71de/bin/uautomizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 1915ee2ae984f6ece38fc0dcbac99e0ba37faddf [2020-11-28 03:20:28,962 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-28 03:20:28,980 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-28 03:20:28,983 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-28 03:20:28,984 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-28 03:20:28,985 INFO L275 PluginConnector]: CDTParser initialized [2020-11-28 03:20:28,985 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_d3fe285b-1e29-4e9f-bebc-2a5cb69e71de/bin/uautomizer/../../sv-benchmarks/c/array-memsafety/rec_strlen-alloca-1.i [2020-11-28 03:20:29,049 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_d3fe285b-1e29-4e9f-bebc-2a5cb69e71de/bin/uautomizer/data/badd2f2cd/1079e3765054480a831168cebba64e06/FLAGf94f4e357 [2020-11-28 03:20:29,519 INFO L306 CDTParser]: Found 1 translation units. [2020-11-28 03:20:29,519 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_d3fe285b-1e29-4e9f-bebc-2a5cb69e71de/sv-benchmarks/c/array-memsafety/rec_strlen-alloca-1.i [2020-11-28 03:20:29,534 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_d3fe285b-1e29-4e9f-bebc-2a5cb69e71de/bin/uautomizer/data/badd2f2cd/1079e3765054480a831168cebba64e06/FLAGf94f4e357 [2020-11-28 03:20:29,858 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_d3fe285b-1e29-4e9f-bebc-2a5cb69e71de/bin/uautomizer/data/badd2f2cd/1079e3765054480a831168cebba64e06 [2020-11-28 03:20:29,861 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-28 03:20:29,862 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2020-11-28 03:20:29,864 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-28 03:20:29,864 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-28 03:20:29,867 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-28 03:20:29,868 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 03:20:29" (1/1) ... [2020-11-28 03:20:29,869 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@71fe8c82 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:20:29, skipping insertion in model container [2020-11-28 03:20:29,870 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 03:20:29" (1/1) ... [2020-11-28 03:20:29,877 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-28 03:20:29,920 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-28 03:20:30,273 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-28 03:20:30,286 INFO L203 MainTranslator]: Completed pre-run [2020-11-28 03:20:30,338 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-28 03:20:30,388 INFO L208 MainTranslator]: Completed translation [2020-11-28 03:20:30,388 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:20:30 WrapperNode [2020-11-28 03:20:30,388 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-28 03:20:30,389 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-28 03:20:30,390 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-28 03:20:30,390 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-28 03:20:30,401 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:20:30" (1/1) ... [2020-11-28 03:20:30,401 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:20:30" (1/1) ... [2020-11-28 03:20:30,413 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:20:30" (1/1) ... [2020-11-28 03:20:30,413 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:20:30" (1/1) ... [2020-11-28 03:20:30,424 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:20:30" (1/1) ... [2020-11-28 03:20:30,428 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:20:30" (1/1) ... [2020-11-28 03:20:30,431 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:20:30" (1/1) ... [2020-11-28 03:20:30,436 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-28 03:20:30,437 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-28 03:20:30,437 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-28 03:20:30,437 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-28 03:20:30,438 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:20:30" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_d3fe285b-1e29-4e9f-bebc-2a5cb69e71de/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 [2020-11-28 03:20:30,532 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-11-28 03:20:30,532 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-28 03:20:30,532 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_32 [2020-11-28 03:20:30,533 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_64 [2020-11-28 03:20:30,533 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint16_identity [2020-11-28 03:20:30,533 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint32_identity [2020-11-28 03:20:30,533 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint64_identity [2020-11-28 03:20:30,533 INFO L138 BoogieDeclarations]: Found implementation of procedure strlen_rec [2020-11-28 03:20:30,533 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-11-28 03:20:30,534 INFO L130 BoogieDeclarations]: Found specification of procedure __ctype_get_mb_cur_max [2020-11-28 03:20:30,534 INFO L130 BoogieDeclarations]: Found specification of procedure atof [2020-11-28 03:20:30,534 INFO L130 BoogieDeclarations]: Found specification of procedure atoi [2020-11-28 03:20:30,534 INFO L130 BoogieDeclarations]: Found specification of procedure atol [2020-11-28 03:20:30,534 INFO L130 BoogieDeclarations]: Found specification of procedure atoll [2020-11-28 03:20:30,534 INFO L130 BoogieDeclarations]: Found specification of procedure strtod [2020-11-28 03:20:30,535 INFO L130 BoogieDeclarations]: Found specification of procedure strtof [2020-11-28 03:20:30,535 INFO L130 BoogieDeclarations]: Found specification of procedure strtold [2020-11-28 03:20:30,535 INFO L130 BoogieDeclarations]: Found specification of procedure strtol [2020-11-28 03:20:30,535 INFO L130 BoogieDeclarations]: Found specification of procedure strtoul [2020-11-28 03:20:30,535 INFO L130 BoogieDeclarations]: Found specification of procedure strtoq [2020-11-28 03:20:30,535 INFO L130 BoogieDeclarations]: Found specification of procedure strtouq [2020-11-28 03:20:30,536 INFO L130 BoogieDeclarations]: Found specification of procedure strtoll [2020-11-28 03:20:30,536 INFO L130 BoogieDeclarations]: Found specification of procedure strtoull [2020-11-28 03:20:30,536 INFO L130 BoogieDeclarations]: Found specification of procedure l64a [2020-11-28 03:20:30,536 INFO L130 BoogieDeclarations]: Found specification of procedure a64l [2020-11-28 03:20:30,536 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_32 [2020-11-28 03:20:30,536 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_64 [2020-11-28 03:20:30,536 INFO L130 BoogieDeclarations]: Found specification of procedure __uint16_identity [2020-11-28 03:20:30,537 INFO L130 BoogieDeclarations]: Found specification of procedure __uint32_identity [2020-11-28 03:20:30,537 INFO L130 BoogieDeclarations]: Found specification of procedure __uint64_identity [2020-11-28 03:20:30,537 INFO L130 BoogieDeclarations]: Found specification of procedure select [2020-11-28 03:20:30,537 INFO L130 BoogieDeclarations]: Found specification of procedure pselect [2020-11-28 03:20:30,537 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_major [2020-11-28 03:20:30,537 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_minor [2020-11-28 03:20:30,537 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_makedev [2020-11-28 03:20:30,538 INFO L130 BoogieDeclarations]: Found specification of procedure random [2020-11-28 03:20:30,538 INFO L130 BoogieDeclarations]: Found specification of procedure srandom [2020-11-28 03:20:30,538 INFO L130 BoogieDeclarations]: Found specification of procedure initstate [2020-11-28 03:20:30,538 INFO L130 BoogieDeclarations]: Found specification of procedure setstate [2020-11-28 03:20:30,538 INFO L130 BoogieDeclarations]: Found specification of procedure random_r [2020-11-28 03:20:30,538 INFO L130 BoogieDeclarations]: Found specification of procedure srandom_r [2020-11-28 03:20:30,539 INFO L130 BoogieDeclarations]: Found specification of procedure initstate_r [2020-11-28 03:20:30,539 INFO L130 BoogieDeclarations]: Found specification of procedure setstate_r [2020-11-28 03:20:30,539 INFO L130 BoogieDeclarations]: Found specification of procedure rand [2020-11-28 03:20:30,539 INFO L130 BoogieDeclarations]: Found specification of procedure srand [2020-11-28 03:20:30,539 INFO L130 BoogieDeclarations]: Found specification of procedure rand_r [2020-11-28 03:20:30,539 INFO L130 BoogieDeclarations]: Found specification of procedure drand48 [2020-11-28 03:20:30,539 INFO L130 BoogieDeclarations]: Found specification of procedure erand48 [2020-11-28 03:20:30,540 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48 [2020-11-28 03:20:30,540 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48 [2020-11-28 03:20:30,540 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48 [2020-11-28 03:20:30,540 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48 [2020-11-28 03:20:30,540 INFO L130 BoogieDeclarations]: Found specification of procedure srand48 [2020-11-28 03:20:30,540 INFO L130 BoogieDeclarations]: Found specification of procedure seed48 [2020-11-28 03:20:30,540 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48 [2020-11-28 03:20:30,541 INFO L130 BoogieDeclarations]: Found specification of procedure drand48_r [2020-11-28 03:20:30,541 INFO L130 BoogieDeclarations]: Found specification of procedure erand48_r [2020-11-28 03:20:30,541 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48_r [2020-11-28 03:20:30,541 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48_r [2020-11-28 03:20:30,541 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48_r [2020-11-28 03:20:30,541 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48_r [2020-11-28 03:20:30,541 INFO L130 BoogieDeclarations]: Found specification of procedure srand48_r [2020-11-28 03:20:30,542 INFO L130 BoogieDeclarations]: Found specification of procedure seed48_r [2020-11-28 03:20:30,542 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48_r [2020-11-28 03:20:30,542 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-11-28 03:20:30,542 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2020-11-28 03:20:30,542 INFO L130 BoogieDeclarations]: Found specification of procedure realloc [2020-11-28 03:20:30,542 INFO L130 BoogieDeclarations]: Found specification of procedure free [2020-11-28 03:20:30,542 INFO L130 BoogieDeclarations]: Found specification of procedure alloca [2020-11-28 03:20:30,543 INFO L130 BoogieDeclarations]: Found specification of procedure valloc [2020-11-28 03:20:30,543 INFO L130 BoogieDeclarations]: Found specification of procedure posix_memalign [2020-11-28 03:20:30,543 INFO L130 BoogieDeclarations]: Found specification of procedure aligned_alloc [2020-11-28 03:20:30,543 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-11-28 03:20:30,543 INFO L130 BoogieDeclarations]: Found specification of procedure atexit [2020-11-28 03:20:30,543 INFO L130 BoogieDeclarations]: Found specification of procedure at_quick_exit [2020-11-28 03:20:30,543 INFO L130 BoogieDeclarations]: Found specification of procedure on_exit [2020-11-28 03:20:30,544 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2020-11-28 03:20:30,544 INFO L130 BoogieDeclarations]: Found specification of procedure quick_exit [2020-11-28 03:20:30,544 INFO L130 BoogieDeclarations]: Found specification of procedure _Exit [2020-11-28 03:20:30,544 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2020-11-28 03:20:30,544 INFO L130 BoogieDeclarations]: Found specification of procedure putenv [2020-11-28 03:20:30,544 INFO L130 BoogieDeclarations]: Found specification of procedure setenv [2020-11-28 03:20:30,544 INFO L130 BoogieDeclarations]: Found specification of procedure unsetenv [2020-11-28 03:20:30,545 INFO L130 BoogieDeclarations]: Found specification of procedure clearenv [2020-11-28 03:20:30,545 INFO L130 BoogieDeclarations]: Found specification of procedure mktemp [2020-11-28 03:20:30,545 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemp [2020-11-28 03:20:30,545 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemps [2020-11-28 03:20:30,545 INFO L130 BoogieDeclarations]: Found specification of procedure mkdtemp [2020-11-28 03:20:30,545 INFO L130 BoogieDeclarations]: Found specification of procedure system [2020-11-28 03:20:30,545 INFO L130 BoogieDeclarations]: Found specification of procedure realpath [2020-11-28 03:20:30,546 INFO L130 BoogieDeclarations]: Found specification of procedure bsearch [2020-11-28 03:20:30,546 INFO L130 BoogieDeclarations]: Found specification of procedure qsort [2020-11-28 03:20:30,546 INFO L130 BoogieDeclarations]: Found specification of procedure abs [2020-11-28 03:20:30,546 INFO L130 BoogieDeclarations]: Found specification of procedure labs [2020-11-28 03:20:30,546 INFO L130 BoogieDeclarations]: Found specification of procedure llabs [2020-11-28 03:20:30,546 INFO L130 BoogieDeclarations]: Found specification of procedure div [2020-11-28 03:20:30,546 INFO L130 BoogieDeclarations]: Found specification of procedure ldiv [2020-11-28 03:20:30,547 INFO L130 BoogieDeclarations]: Found specification of procedure lldiv [2020-11-28 03:20:30,547 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt [2020-11-28 03:20:30,547 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt [2020-11-28 03:20:30,547 INFO L130 BoogieDeclarations]: Found specification of procedure gcvt [2020-11-28 03:20:30,547 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt [2020-11-28 03:20:30,547 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt [2020-11-28 03:20:30,547 INFO L130 BoogieDeclarations]: Found specification of procedure qgcvt [2020-11-28 03:20:30,548 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt_r [2020-11-28 03:20:30,548 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt_r [2020-11-28 03:20:30,548 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt_r [2020-11-28 03:20:30,548 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt_r [2020-11-28 03:20:30,548 INFO L130 BoogieDeclarations]: Found specification of procedure mblen [2020-11-28 03:20:30,548 INFO L130 BoogieDeclarations]: Found specification of procedure mbtowc [2020-11-28 03:20:30,548 INFO L130 BoogieDeclarations]: Found specification of procedure wctomb [2020-11-28 03:20:30,549 INFO L130 BoogieDeclarations]: Found specification of procedure mbstowcs [2020-11-28 03:20:30,549 INFO L130 BoogieDeclarations]: Found specification of procedure wcstombs [2020-11-28 03:20:30,549 INFO L130 BoogieDeclarations]: Found specification of procedure rpmatch [2020-11-28 03:20:30,549 INFO L130 BoogieDeclarations]: Found specification of procedure getsubopt [2020-11-28 03:20:30,549 INFO L130 BoogieDeclarations]: Found specification of procedure getloadavg [2020-11-28 03:20:30,549 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-11-28 03:20:30,549 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-11-28 03:20:30,550 INFO L130 BoogieDeclarations]: Found specification of procedure strlen_rec [2020-11-28 03:20:30,550 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-11-28 03:20:30,550 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-11-28 03:20:30,550 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-28 03:20:30,550 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-11-28 03:20:30,550 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-11-28 03:20:30,550 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-11-28 03:20:30,551 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-28 03:20:31,080 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-28 03:20:31,081 INFO L298 CfgBuilder]: Removed 1 assume(true) statements. [2020-11-28 03:20:31,082 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 03:20:31 BoogieIcfgContainer [2020-11-28 03:20:31,083 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-28 03:20:31,087 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-28 03:20:31,088 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-28 03:20:31,094 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-28 03:20:31,094 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 28.11 03:20:29" (1/3) ... [2020-11-28 03:20:31,095 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@372fecaf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.11 03:20:31, skipping insertion in model container [2020-11-28 03:20:31,095 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:20:30" (2/3) ... [2020-11-28 03:20:31,096 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@372fecaf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.11 03:20:31, skipping insertion in model container [2020-11-28 03:20:31,096 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 03:20:31" (3/3) ... [2020-11-28 03:20:31,097 INFO L111 eAbstractionObserver]: Analyzing ICFG rec_strlen-alloca-1.i [2020-11-28 03:20:31,110 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-28 03:20:31,115 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 7 error locations. [2020-11-28 03:20:31,126 INFO L253 AbstractCegarLoop]: Starting to check reachability of 7 error locations. [2020-11-28 03:20:31,154 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-28 03:20:31,154 INFO L378 AbstractCegarLoop]: Hoare is false [2020-11-28 03:20:31,162 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-28 03:20:31,162 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-28 03:20:31,162 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-28 03:20:31,162 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-28 03:20:31,163 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-28 03:20:31,163 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-28 03:20:31,174 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-11-28 03:20:31,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-11-28 03:20:31,182 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 03:20:31,182 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 03:20:31,182 INFO L429 AbstractCegarLoop]: === Iteration 1 === [mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, strlen_recErr1REQUIRES_VIOLATION, strlen_recErr0REQUIRES_VIOLATION]=== [2020-11-28 03:20:31,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:20:31,187 INFO L82 PathProgramCache]: Analyzing trace with hash -2117754822, now seen corresponding path program 1 times [2020-11-28 03:20:31,196 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:20:31,196 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [864740043] [2020-11-28 03:20:31,196 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:20:31,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:31,393 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-28 03:20:31,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:31,404 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:20:31,404 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [864740043] [2020-11-28 03:20:31,405 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-28 03:20:31,405 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-11-28 03:20:31,406 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1778275595] [2020-11-28 03:20:31,409 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-11-28 03:20:31,410 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-28 03:20:31,422 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-11-28 03:20:31,423 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-11-28 03:20:31,425 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 4 states. [2020-11-28 03:20:31,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 03:20:31,571 INFO L93 Difference]: Finished difference Result 31 states and 34 transitions. [2020-11-28 03:20:31,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-11-28 03:20:31,574 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 10 [2020-11-28 03:20:31,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 03:20:31,581 INFO L225 Difference]: With dead ends: 31 [2020-11-28 03:20:31,595 INFO L226 Difference]: Without dead ends: 28 [2020-11-28 03:20:31,596 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 [2020-11-28 03:20:31,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-11-28 03:20:31,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-11-28 03:20:31,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-11-28 03:20:31,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2020-11-28 03:20:31,639 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 10 [2020-11-28 03:20:31,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 03:20:31,640 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2020-11-28 03:20:31,640 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-11-28 03:20:31,640 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2020-11-28 03:20:31,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-11-28 03:20:31,641 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 03:20:31,641 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 03:20:31,641 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-28 03:20:31,641 INFO L429 AbstractCegarLoop]: === Iteration 2 === [mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, strlen_recErr1REQUIRES_VIOLATION, strlen_recErr0REQUIRES_VIOLATION]=== [2020-11-28 03:20:31,642 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:20:31,642 INFO L82 PathProgramCache]: Analyzing trace with hash -2117754821, now seen corresponding path program 1 times [2020-11-28 03:20:31,643 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:20:31,643 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [595875754] [2020-11-28 03:20:31,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:20:31,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:31,758 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-28 03:20:31,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:31,765 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:20:31,766 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [595875754] [2020-11-28 03:20:31,766 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-28 03:20:31,766 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-11-28 03:20:31,766 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2070392086] [2020-11-28 03:20:31,767 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-11-28 03:20:31,768 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-28 03:20:31,768 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-11-28 03:20:31,769 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-11-28 03:20:31,769 INFO L87 Difference]: Start difference. First operand 28 states and 31 transitions. Second operand 5 states. [2020-11-28 03:20:31,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 03:20:31,904 INFO L93 Difference]: Finished difference Result 27 states and 30 transitions. [2020-11-28 03:20:31,904 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-11-28 03:20:31,904 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 10 [2020-11-28 03:20:31,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 03:20:31,905 INFO L225 Difference]: With dead ends: 27 [2020-11-28 03:20:31,905 INFO L226 Difference]: Without dead ends: 27 [2020-11-28 03:20:31,906 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 [2020-11-28 03:20:31,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-11-28 03:20:31,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-11-28 03:20:31,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-11-28 03:20:31,910 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 30 transitions. [2020-11-28 03:20:31,910 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 30 transitions. Word has length 10 [2020-11-28 03:20:31,911 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 03:20:31,911 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 30 transitions. [2020-11-28 03:20:31,911 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-11-28 03:20:31,911 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 30 transitions. [2020-11-28 03:20:31,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-11-28 03:20:31,912 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 03:20:31,912 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 03:20:31,912 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-11-28 03:20:31,912 INFO L429 AbstractCegarLoop]: === Iteration 3 === [mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, strlen_recErr1REQUIRES_VIOLATION, strlen_recErr0REQUIRES_VIOLATION]=== [2020-11-28 03:20:31,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:20:31,913 INFO L82 PathProgramCache]: Analyzing trace with hash -2117754768, now seen corresponding path program 1 times [2020-11-28 03:20:31,913 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:20:31,913 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [19129194] [2020-11-28 03:20:31,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:20:31,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:32,000 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-28 03:20:32,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:32,006 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:20:32,007 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [19129194] [2020-11-28 03:20:32,007 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-28 03:20:32,007 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-11-28 03:20:32,007 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1560019303] [2020-11-28 03:20:32,008 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-11-28 03:20:32,008 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-28 03:20:32,008 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-11-28 03:20:32,009 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-11-28 03:20:32,009 INFO L87 Difference]: Start difference. First operand 27 states and 30 transitions. Second operand 5 states. [2020-11-28 03:20:32,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 03:20:32,109 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2020-11-28 03:20:32,111 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-11-28 03:20:32,111 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 10 [2020-11-28 03:20:32,111 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 03:20:32,112 INFO L225 Difference]: With dead ends: 34 [2020-11-28 03:20:32,112 INFO L226 Difference]: Without dead ends: 34 [2020-11-28 03:20:32,113 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 [2020-11-28 03:20:32,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-11-28 03:20:32,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 29. [2020-11-28 03:20:32,118 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-11-28 03:20:32,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2020-11-28 03:20:32,119 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 10 [2020-11-28 03:20:32,119 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 03:20:32,120 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2020-11-28 03:20:32,120 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-11-28 03:20:32,120 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2020-11-28 03:20:32,120 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-11-28 03:20:32,120 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 03:20:32,121 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 03:20:32,121 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-11-28 03:20:32,121 INFO L429 AbstractCegarLoop]: === Iteration 4 === [mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, strlen_recErr1REQUIRES_VIOLATION, strlen_recErr0REQUIRES_VIOLATION]=== [2020-11-28 03:20:32,121 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:20:32,121 INFO L82 PathProgramCache]: Analyzing trace with hash -2117695186, now seen corresponding path program 1 times [2020-11-28 03:20:32,122 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:20:32,122 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1996245060] [2020-11-28 03:20:32,122 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:20:32,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:32,222 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-28 03:20:32,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:32,229 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:20:32,229 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1996245060] [2020-11-28 03:20:32,229 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-28 03:20:32,230 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-11-28 03:20:32,230 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [457030585] [2020-11-28 03:20:32,230 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-11-28 03:20:32,230 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-28 03:20:32,231 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-11-28 03:20:32,231 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-11-28 03:20:32,231 INFO L87 Difference]: Start difference. First operand 29 states and 32 transitions. Second operand 5 states. [2020-11-28 03:20:32,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 03:20:32,386 INFO L93 Difference]: Finished difference Result 38 states and 42 transitions. [2020-11-28 03:20:32,386 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-28 03:20:32,386 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 10 [2020-11-28 03:20:32,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 03:20:32,388 INFO L225 Difference]: With dead ends: 38 [2020-11-28 03:20:32,388 INFO L226 Difference]: Without dead ends: 38 [2020-11-28 03:20:32,388 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 [2020-11-28 03:20:32,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-11-28 03:20:32,392 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2020-11-28 03:20:32,392 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-11-28 03:20:32,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2020-11-28 03:20:32,393 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 10 [2020-11-28 03:20:32,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 03:20:32,394 INFO L481 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2020-11-28 03:20:32,394 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-11-28 03:20:32,394 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2020-11-28 03:20:32,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-11-28 03:20:32,395 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 03:20:32,395 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 03:20:32,395 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-11-28 03:20:32,395 INFO L429 AbstractCegarLoop]: === Iteration 5 === [mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, strlen_recErr1REQUIRES_VIOLATION, strlen_recErr0REQUIRES_VIOLATION]=== [2020-11-28 03:20:32,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:20:32,396 INFO L82 PathProgramCache]: Analyzing trace with hash -1259263901, now seen corresponding path program 1 times [2020-11-28 03:20:32,396 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:20:32,396 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [640420880] [2020-11-28 03:20:32,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:20:32,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:32,484 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-28 03:20:32,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:32,489 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:20:32,490 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [640420880] [2020-11-28 03:20:32,490 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-28 03:20:32,490 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-11-28 03:20:32,490 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1826857956] [2020-11-28 03:20:32,491 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-11-28 03:20:32,491 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-28 03:20:32,491 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-11-28 03:20:32,492 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-11-28 03:20:32,492 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 6 states. [2020-11-28 03:20:32,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 03:20:32,619 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2020-11-28 03:20:32,619 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-28 03:20:32,620 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2020-11-28 03:20:32,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 03:20:32,621 INFO L225 Difference]: With dead ends: 30 [2020-11-28 03:20:32,621 INFO L226 Difference]: Without dead ends: 30 [2020-11-28 03:20:32,621 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 [2020-11-28 03:20:32,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-11-28 03:20:32,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-11-28 03:20:32,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-11-28 03:20:32,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2020-11-28 03:20:32,626 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 13 [2020-11-28 03:20:32,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 03:20:32,626 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2020-11-28 03:20:32,626 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-11-28 03:20:32,626 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2020-11-28 03:20:32,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-11-28 03:20:32,627 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 03:20:32,627 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 03:20:32,627 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-11-28 03:20:32,628 INFO L429 AbstractCegarLoop]: === Iteration 6 === [mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, strlen_recErr1REQUIRES_VIOLATION, strlen_recErr0REQUIRES_VIOLATION]=== [2020-11-28 03:20:32,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:20:32,628 INFO L82 PathProgramCache]: Analyzing trace with hash -1259263900, now seen corresponding path program 1 times [2020-11-28 03:20:32,628 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:20:32,629 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1217523325] [2020-11-28 03:20:32,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:20:32,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:32,716 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-28 03:20:32,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:32,721 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:20:32,721 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1217523325] [2020-11-28 03:20:32,721 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-28 03:20:32,721 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-11-28 03:20:32,722 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2022859284] [2020-11-28 03:20:32,722 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-11-28 03:20:32,722 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-28 03:20:32,723 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-11-28 03:20:32,723 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-11-28 03:20:32,723 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand 7 states. [2020-11-28 03:20:32,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 03:20:32,922 INFO L93 Difference]: Finished difference Result 37 states and 42 transitions. [2020-11-28 03:20:32,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-11-28 03:20:32,923 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 13 [2020-11-28 03:20:32,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 03:20:32,924 INFO L225 Difference]: With dead ends: 37 [2020-11-28 03:20:32,924 INFO L226 Difference]: Without dead ends: 37 [2020-11-28 03:20:32,925 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 [2020-11-28 03:20:32,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-11-28 03:20:32,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-11-28 03:20:32,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-11-28 03:20:32,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 42 transitions. [2020-11-28 03:20:32,930 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 42 transitions. Word has length 13 [2020-11-28 03:20:32,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 03:20:32,930 INFO L481 AbstractCegarLoop]: Abstraction has 37 states and 42 transitions. [2020-11-28 03:20:32,930 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-11-28 03:20:32,930 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 42 transitions. [2020-11-28 03:20:32,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-11-28 03:20:32,931 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 03:20:32,931 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 03:20:32,931 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-11-28 03:20:32,931 INFO L429 AbstractCegarLoop]: === Iteration 7 === [mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, strlen_recErr1REQUIRES_VIOLATION, strlen_recErr0REQUIRES_VIOLATION]=== [2020-11-28 03:20:32,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:20:32,932 INFO L82 PathProgramCache]: Analyzing trace with hash -1143813903, now seen corresponding path program 1 times [2020-11-28 03:20:32,932 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:20:32,932 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [17486067] [2020-11-28 03:20:32,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:20:32,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:33,024 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-28 03:20:33,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:33,029 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:20:33,029 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [17486067] [2020-11-28 03:20:33,029 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [724054113] [2020-11-28 03:20:33,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_d3fe285b-1e29-4e9f-bebc-2a5cb69e71de/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 [2020-11-28 03:20:33,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:33,219 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 11 conjunts are in the unsatisfiable core [2020-11-28 03:20:33,224 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:20:33,335 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 [2020-11-28 03:20:33,335 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-28 03:20:33,443 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-11-28 03:20:33,444 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-28 03:20:33,444 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2020-11-28 03:20:33,444 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:13, output treesize:12 [2020-11-28 03:20:33,503 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:20:33,503 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-28 03:20:33,504 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2020-11-28 03:20:33,504 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1231670296] [2020-11-28 03:20:33,504 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-11-28 03:20:33,504 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-28 03:20:33,505 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-11-28 03:20:33,505 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2020-11-28 03:20:33,505 INFO L87 Difference]: Start difference. First operand 37 states and 42 transitions. Second operand 7 states. [2020-11-28 03:20:33,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 03:20:33,667 INFO L93 Difference]: Finished difference Result 43 states and 48 transitions. [2020-11-28 03:20:33,667 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-28 03:20:33,667 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 14 [2020-11-28 03:20:33,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 03:20:33,668 INFO L225 Difference]: With dead ends: 43 [2020-11-28 03:20:33,668 INFO L226 Difference]: Without dead ends: 43 [2020-11-28 03:20:33,669 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 [2020-11-28 03:20:33,669 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-11-28 03:20:33,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 34. [2020-11-28 03:20:33,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-11-28 03:20:33,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 38 transitions. [2020-11-28 03:20:33,674 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 38 transitions. Word has length 14 [2020-11-28 03:20:33,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 03:20:33,674 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 38 transitions. [2020-11-28 03:20:33,674 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-11-28 03:20:33,674 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 38 transitions. [2020-11-28 03:20:33,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-11-28 03:20:33,675 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 03:20:33,675 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 03:20:33,885 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2020-11-28 03:20:33,885 INFO L429 AbstractCegarLoop]: === Iteration 8 === [mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, strlen_recErr1REQUIRES_VIOLATION, strlen_recErr0REQUIRES_VIOLATION]=== [2020-11-28 03:20:33,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:20:33,886 INFO L82 PathProgramCache]: Analyzing trace with hash 228211982, now seen corresponding path program 1 times [2020-11-28 03:20:33,886 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:20:33,886 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1461855101] [2020-11-28 03:20:33,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:20:33,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:34,072 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-28 03:20:34,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:34,075 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:20:34,076 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1461855101] [2020-11-28 03:20:34,076 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-28 03:20:34,076 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2020-11-28 03:20:34,076 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1084595695] [2020-11-28 03:20:34,076 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-11-28 03:20:34,076 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-28 03:20:34,076 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-11-28 03:20:34,077 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2020-11-28 03:20:34,077 INFO L87 Difference]: Start difference. First operand 34 states and 38 transitions. Second operand 9 states. [2020-11-28 03:20:34,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 03:20:34,321 INFO L93 Difference]: Finished difference Result 44 states and 47 transitions. [2020-11-28 03:20:34,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-11-28 03:20:34,321 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 17 [2020-11-28 03:20:34,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 03:20:34,322 INFO L225 Difference]: With dead ends: 44 [2020-11-28 03:20:34,322 INFO L226 Difference]: Without dead ends: 44 [2020-11-28 03:20:34,323 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 [2020-11-28 03:20:34,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-11-28 03:20:34,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 41. [2020-11-28 03:20:34,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-11-28 03:20:34,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2020-11-28 03:20:34,328 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 17 [2020-11-28 03:20:34,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 03:20:34,328 INFO L481 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2020-11-28 03:20:34,329 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-11-28 03:20:34,329 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2020-11-28 03:20:34,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-11-28 03:20:34,329 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 03:20:34,330 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 03:20:34,330 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-11-28 03:20:34,330 INFO L429 AbstractCegarLoop]: === Iteration 9 === [mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, strlen_recErr1REQUIRES_VIOLATION, strlen_recErr0REQUIRES_VIOLATION]=== [2020-11-28 03:20:34,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:20:34,331 INFO L82 PathProgramCache]: Analyzing trace with hash 929276560, now seen corresponding path program 1 times [2020-11-28 03:20:34,331 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:20:34,331 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1413194610] [2020-11-28 03:20:34,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:20:34,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:34,511 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-28 03:20:34,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:34,515 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:20:34,515 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1413194610] [2020-11-28 03:20:34,515 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-28 03:20:34,515 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2020-11-28 03:20:34,516 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1114493265] [2020-11-28 03:20:34,516 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-11-28 03:20:34,516 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-28 03:20:34,516 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-11-28 03:20:34,517 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2020-11-28 03:20:34,517 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand 10 states. [2020-11-28 03:20:34,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 03:20:34,781 INFO L93 Difference]: Finished difference Result 55 states and 59 transitions. [2020-11-28 03:20:34,782 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-11-28 03:20:34,782 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 17 [2020-11-28 03:20:34,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 03:20:34,784 INFO L225 Difference]: With dead ends: 55 [2020-11-28 03:20:34,784 INFO L226 Difference]: Without dead ends: 55 [2020-11-28 03:20:34,785 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 [2020-11-28 03:20:34,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-11-28 03:20:34,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 42. [2020-11-28 03:20:34,789 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-11-28 03:20:34,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 47 transitions. [2020-11-28 03:20:34,790 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 47 transitions. Word has length 17 [2020-11-28 03:20:34,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 03:20:34,790 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 47 transitions. [2020-11-28 03:20:34,790 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-11-28 03:20:34,790 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 47 transitions. [2020-11-28 03:20:34,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-11-28 03:20:34,791 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 03:20:34,791 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 03:20:34,791 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-11-28 03:20:34,791 INFO L429 AbstractCegarLoop]: === Iteration 10 === [mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, strlen_recErr1REQUIRES_VIOLATION, strlen_recErr0REQUIRES_VIOLATION]=== [2020-11-28 03:20:34,792 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:20:34,792 INFO L82 PathProgramCache]: Analyzing trace with hash -1516451273, now seen corresponding path program 1 times [2020-11-28 03:20:34,792 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:20:34,792 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1041668914] [2020-11-28 03:20:34,792 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:20:34,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:34,858 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-28 03:20:34,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:34,861 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-11-28 03:20:34,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:34,865 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:20:34,866 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1041668914] [2020-11-28 03:20:34,866 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-28 03:20:34,866 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-11-28 03:20:34,866 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1804433792] [2020-11-28 03:20:34,869 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-11-28 03:20:34,869 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-28 03:20:34,870 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-11-28 03:20:34,870 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-11-28 03:20:34,870 INFO L87 Difference]: Start difference. First operand 42 states and 47 transitions. Second operand 5 states. [2020-11-28 03:20:34,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 03:20:34,932 INFO L93 Difference]: Finished difference Result 41 states and 46 transitions. [2020-11-28 03:20:34,932 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-11-28 03:20:34,932 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 18 [2020-11-28 03:20:34,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 03:20:34,933 INFO L225 Difference]: With dead ends: 41 [2020-11-28 03:20:34,933 INFO L226 Difference]: Without dead ends: 24 [2020-11-28 03:20:34,933 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 [2020-11-28 03:20:34,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-11-28 03:20:34,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 22. [2020-11-28 03:20:34,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-11-28 03:20:34,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2020-11-28 03:20:34,935 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 18 [2020-11-28 03:20:34,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 03:20:34,936 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2020-11-28 03:20:34,936 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-11-28 03:20:34,936 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2020-11-28 03:20:34,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-11-28 03:20:34,936 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 03:20:34,937 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] [2020-11-28 03:20:34,937 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-11-28 03:20:34,937 INFO L429 AbstractCegarLoop]: === Iteration 11 === [mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, strlen_recErr1REQUIRES_VIOLATION, strlen_recErr0REQUIRES_VIOLATION]=== [2020-11-28 03:20:34,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:20:34,937 INFO L82 PathProgramCache]: Analyzing trace with hash 1650962797, now seen corresponding path program 1 times [2020-11-28 03:20:34,938 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:20:34,938 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1444495314] [2020-11-28 03:20:34,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:20:34,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:35,104 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-28 03:20:35,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:35,110 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:20:35,110 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1444495314] [2020-11-28 03:20:35,110 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1561422629] [2020-11-28 03:20:35,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_d3fe285b-1e29-4e9f-bebc-2a5cb69e71de/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 [2020-11-28 03:20:35,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:35,234 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 21 conjunts are in the unsatisfiable core [2020-11-28 03:20:35,236 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:20:35,388 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:20:35,389 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-28 03:20:35,389 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 14 [2020-11-28 03:20:35,389 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2086654623] [2020-11-28 03:20:35,389 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-11-28 03:20:35,389 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-28 03:20:35,390 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-11-28 03:20:35,390 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=177, Unknown=0, NotChecked=0, Total=210 [2020-11-28 03:20:35,390 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand 15 states. [2020-11-28 03:20:35,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 03:20:35,693 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2020-11-28 03:20:35,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-11-28 03:20:35,694 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 21 [2020-11-28 03:20:35,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 03:20:35,695 INFO L225 Difference]: With dead ends: 31 [2020-11-28 03:20:35,695 INFO L226 Difference]: Without dead ends: 31 [2020-11-28 03:20:35,695 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 [2020-11-28 03:20:35,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-11-28 03:20:35,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 26. [2020-11-28 03:20:35,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-11-28 03:20:35,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 27 transitions. [2020-11-28 03:20:35,698 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 27 transitions. Word has length 21 [2020-11-28 03:20:35,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 03:20:35,698 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 27 transitions. [2020-11-28 03:20:35,698 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-11-28 03:20:35,698 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 27 transitions. [2020-11-28 03:20:35,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-11-28 03:20:35,699 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 03:20:35,699 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] [2020-11-28 03:20:35,910 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 03:20:35,911 INFO L429 AbstractCegarLoop]: === Iteration 12 === [mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, strlen_recErr1REQUIRES_VIOLATION, strlen_recErr0REQUIRES_VIOLATION]=== [2020-11-28 03:20:35,911 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:20:35,911 INFO L82 PathProgramCache]: Analyzing trace with hash -1692198505, now seen corresponding path program 2 times [2020-11-28 03:20:35,911 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:20:35,911 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1181958116] [2020-11-28 03:20:35,912 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:20:35,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:36,267 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-28 03:20:36,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:36,273 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 5 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:20:36,273 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1181958116] [2020-11-28 03:20:36,274 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [326959063] [2020-11-28 03:20:36,274 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_d3fe285b-1e29-4e9f-bebc-2a5cb69e71de/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 [2020-11-28 03:20:36,399 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-11-28 03:20:36,400 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-28 03:20:36,401 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 33 conjunts are in the unsatisfiable core [2020-11-28 03:20:36,403 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:20:36,475 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 [2020-11-28 03:20:36,475 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-28 03:20:36,491 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-28 03:20:36,493 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. [2020-11-28 03:20:36,493 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:21 [2020-11-28 03:20:36,912 INFO L350 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2020-11-28 03:20:36,912 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 [2020-11-28 03:20:36,913 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2020-11-28 03:20:36,930 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-28 03:20:36,933 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-11-28 03:20:36,937 INFO L603 QuantifierPusher]: Distributing 3 conjuncts over 2 disjuncts [2020-11-28 03:20:36,947 INFO L545 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-11-28 03:20:36,947 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:36, output treesize:27 [2020-11-28 03:20:37,012 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 03:20:37,161 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:20:37,161 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-28 03:20:37,162 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 25 [2020-11-28 03:20:37,162 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1150434143] [2020-11-28 03:20:37,162 INFO L461 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-11-28 03:20:37,162 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-28 03:20:37,163 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-11-28 03:20:37,163 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=544, Unknown=0, NotChecked=0, Total=600 [2020-11-28 03:20:37,163 INFO L87 Difference]: Start difference. First operand 26 states and 27 transitions. Second operand 25 states. [2020-11-28 03:20:38,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 03:20:38,522 INFO L93 Difference]: Finished difference Result 48 states and 49 transitions. [2020-11-28 03:20:38,522 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-11-28 03:20:38,522 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 25 [2020-11-28 03:20:38,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 03:20:38,523 INFO L225 Difference]: With dead ends: 48 [2020-11-28 03:20:38,523 INFO L226 Difference]: Without dead ends: 39 [2020-11-28 03:20:38,524 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 298 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=207, Invalid=1773, Unknown=0, NotChecked=0, Total=1980 [2020-11-28 03:20:38,524 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-11-28 03:20:38,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 34. [2020-11-28 03:20:38,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-11-28 03:20:38,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 35 transitions. [2020-11-28 03:20:38,530 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 35 transitions. Word has length 25 [2020-11-28 03:20:38,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 03:20:38,531 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 35 transitions. [2020-11-28 03:20:38,531 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-11-28 03:20:38,531 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 35 transitions. [2020-11-28 03:20:38,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-11-28 03:20:38,532 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 03:20:38,532 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] [2020-11-28 03:20:38,750 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2020-11-28 03:20:38,751 INFO L429 AbstractCegarLoop]: === Iteration 13 === [mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, strlen_recErr1REQUIRES_VIOLATION, strlen_recErr0REQUIRES_VIOLATION]=== [2020-11-28 03:20:38,751 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:20:38,751 INFO L82 PathProgramCache]: Analyzing trace with hash -1867118562, now seen corresponding path program 3 times [2020-11-28 03:20:38,751 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:20:38,751 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1840564376] [2020-11-28 03:20:38,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:20:38,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:38,955 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-28 03:20:38,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:38,974 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 8 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:20:38,975 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1840564376] [2020-11-28 03:20:38,975 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1714408729] [2020-11-28 03:20:38,975 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_d3fe285b-1e29-4e9f-bebc-2a5cb69e71de/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 [2020-11-28 03:20:39,097 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2020-11-28 03:20:39,098 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-28 03:20:39,099 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 37 conjunts are in the unsatisfiable core [2020-11-28 03:20:39,102 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:20:39,232 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 [2020-11-28 03:20:39,232 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-28 03:20:39,238 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-28 03:20:39,239 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. [2020-11-28 03:20:39,239 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:21, output treesize:17 [2020-11-28 03:20:39,391 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 [2020-11-28 03:20:39,392 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-28 03:20:39,394 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-28 03:20:39,394 INFO L545 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-11-28 03:20:39,394 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:15, output treesize:3 [2020-11-28 03:20:39,398 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 8 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:20:39,398 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-28 03:20:39,398 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 24 [2020-11-28 03:20:39,399 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1466532131] [2020-11-28 03:20:39,399 INFO L461 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-11-28 03:20:39,399 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-28 03:20:39,400 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-11-28 03:20:39,400 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=496, Unknown=0, NotChecked=0, Total=552 [2020-11-28 03:20:39,400 INFO L87 Difference]: Start difference. First operand 34 states and 35 transitions. Second operand 24 states. [2020-11-28 03:20:40,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 03:20:40,022 INFO L93 Difference]: Finished difference Result 54 states and 55 transitions. [2020-11-28 03:20:40,023 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-11-28 03:20:40,023 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 33 [2020-11-28 03:20:40,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 03:20:40,023 INFO L225 Difference]: With dead ends: 54 [2020-11-28 03:20:40,024 INFO L226 Difference]: Without dead ends: 41 [2020-11-28 03:20:40,024 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=120, Invalid=1002, Unknown=0, NotChecked=0, Total=1122 [2020-11-28 03:20:40,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-11-28 03:20:40,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 38. [2020-11-28 03:20:40,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-11-28 03:20:40,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 39 transitions. [2020-11-28 03:20:40,028 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 39 transitions. Word has length 33 [2020-11-28 03:20:40,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 03:20:40,028 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 39 transitions. [2020-11-28 03:20:40,028 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-11-28 03:20:40,029 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 39 transitions. [2020-11-28 03:20:40,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-11-28 03:20:40,030 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 03:20:40,030 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] [2020-11-28 03:20:40,246 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 03:20:40,247 INFO L429 AbstractCegarLoop]: === Iteration 14 === [mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, strlen_recErr1REQUIRES_VIOLATION, strlen_recErr0REQUIRES_VIOLATION]=== [2020-11-28 03:20:40,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:20:40,247 INFO L82 PathProgramCache]: Analyzing trace with hash 545438971, now seen corresponding path program 4 times [2020-11-28 03:20:40,247 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:20:40,248 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1960183215] [2020-11-28 03:20:40,248 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:20:40,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:40,482 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-28 03:20:40,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:40,489 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 1 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:20:40,489 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1960183215] [2020-11-28 03:20:40,489 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [626040762] [2020-11-28 03:20:40,489 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_d3fe285b-1e29-4e9f-bebc-2a5cb69e71de/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 [2020-11-28 03:20:40,584 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-11-28 03:20:40,585 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-28 03:20:40,587 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 47 conjunts are in the unsatisfiable core [2020-11-28 03:20:40,593 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:20:40,607 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 [2020-11-28 03:20:40,607 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-28 03:20:40,618 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-28 03:20:40,618 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2020-11-28 03:20:40,619 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:13, output treesize:12 [2020-11-28 03:20:40,680 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 [2020-11-28 03:20:40,680 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-28 03:20:40,686 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-28 03:20:40,686 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-11-28 03:20:40,686 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:27, output treesize:23 [2020-11-28 03:20:41,002 INFO L350 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2020-11-28 03:20:41,003 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 [2020-11-28 03:20:41,003 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2020-11-28 03:20:41,013 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-28 03:20:41,013 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-11-28 03:20:41,013 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:30, output treesize:24 [2020-11-28 03:20:41,048 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 03:20:41,193 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 8 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:20:41,193 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-28 03:20:41,193 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17] total 28 [2020-11-28 03:20:41,193 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1034568157] [2020-11-28 03:20:41,194 INFO L461 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-11-28 03:20:41,194 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-28 03:20:41,195 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-11-28 03:20:41,195 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=748, Unknown=0, NotChecked=0, Total=812 [2020-11-28 03:20:41,196 INFO L87 Difference]: Start difference. First operand 38 states and 39 transitions. Second operand 29 states. [2020-11-28 03:20:42,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 03:20:42,095 INFO L93 Difference]: Finished difference Result 44 states and 45 transitions. [2020-11-28 03:20:42,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-11-28 03:20:42,096 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 37 [2020-11-28 03:20:42,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 03:20:42,096 INFO L225 Difference]: With dead ends: 44 [2020-11-28 03:20:42,097 INFO L226 Difference]: Without dead ends: 44 [2020-11-28 03:20:42,098 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 156 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=151, Invalid=1489, Unknown=0, NotChecked=0, Total=1640 [2020-11-28 03:20:42,098 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-11-28 03:20:42,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 42. [2020-11-28 03:20:42,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-11-28 03:20:42,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2020-11-28 03:20:42,101 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 37 [2020-11-28 03:20:42,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 03:20:42,101 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2020-11-28 03:20:42,101 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-11-28 03:20:42,101 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2020-11-28 03:20:42,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-11-28 03:20:42,106 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 03:20:42,107 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] [2020-11-28 03:20:42,318 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2020-11-28 03:20:42,319 INFO L429 AbstractCegarLoop]: === Iteration 15 === [mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, strlen_recErr1REQUIRES_VIOLATION, strlen_recErr0REQUIRES_VIOLATION]=== [2020-11-28 03:20:42,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:20:42,319 INFO L82 PathProgramCache]: Analyzing trace with hash 1989258789, now seen corresponding path program 5 times [2020-11-28 03:20:42,319 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:20:42,319 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2055159264] [2020-11-28 03:20:42,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:20:42,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:42,621 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-28 03:20:42,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:42,629 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 11 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:20:42,629 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2055159264] [2020-11-28 03:20:42,629 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [658931925] [2020-11-28 03:20:42,630 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_d3fe285b-1e29-4e9f-bebc-2a5cb69e71de/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 [2020-11-28 03:20:42,742 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2020-11-28 03:20:42,742 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-28 03:20:42,744 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 56 conjunts are in the unsatisfiable core [2020-11-28 03:20:42,762 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:20:42,773 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 [2020-11-28 03:20:42,773 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-28 03:20:42,779 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-28 03:20:42,780 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2020-11-28 03:20:42,780 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:13, output treesize:12 [2020-11-28 03:20:42,905 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 [2020-11-28 03:20:42,905 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-28 03:20:42,910 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-28 03:20:42,911 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-11-28 03:20:42,911 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:21 [2020-11-28 03:20:43,256 INFO L350 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2020-11-28 03:20:43,256 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 [2020-11-28 03:20:43,257 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2020-11-28 03:20:43,266 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-28 03:20:43,266 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-11-28 03:20:43,267 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:27, output treesize:21 [2020-11-28 03:20:43,305 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 03:20:43,426 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 6 proven. 41 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:20:43,426 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-28 03:20:43,427 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 36 [2020-11-28 03:20:43,427 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [633707062] [2020-11-28 03:20:43,427 INFO L461 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-11-28 03:20:43,427 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-28 03:20:43,428 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-11-28 03:20:43,429 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=1186, Unknown=0, NotChecked=0, Total=1260 [2020-11-28 03:20:43,429 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand 36 states. [2020-11-28 03:20:45,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 03:20:45,325 INFO L93 Difference]: Finished difference Result 72 states and 73 transitions. [2020-11-28 03:20:45,326 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-11-28 03:20:45,326 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 41 [2020-11-28 03:20:45,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 03:20:45,327 INFO L225 Difference]: With dead ends: 72 [2020-11-28 03:20:45,327 INFO L226 Difference]: Without dead ends: 55 [2020-11-28 03:20:45,328 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 551 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=293, Invalid=3997, Unknown=0, NotChecked=0, Total=4290 [2020-11-28 03:20:45,328 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-11-28 03:20:45,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 50. [2020-11-28 03:20:45,331 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-11-28 03:20:45,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 51 transitions. [2020-11-28 03:20:45,331 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 51 transitions. Word has length 41 [2020-11-28 03:20:45,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 03:20:45,332 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 51 transitions. [2020-11-28 03:20:45,332 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-11-28 03:20:45,332 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 51 transitions. [2020-11-28 03:20:45,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-11-28 03:20:45,333 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 03:20:45,333 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] [2020-11-28 03:20:45,550 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 03:20:45,551 INFO L429 AbstractCegarLoop]: === Iteration 16 === [mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4ENSURES_VIOLATIONMEMORY_LEAK, mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, strlen_recErr1REQUIRES_VIOLATION, strlen_recErr0REQUIRES_VIOLATION]=== [2020-11-28 03:20:45,551 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:20:45,551 INFO L82 PathProgramCache]: Analyzing trace with hash -1584706644, now seen corresponding path program 6 times [2020-11-28 03:20:45,551 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:20:45,551 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [413740020] [2020-11-28 03:20:45,552 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:20:45,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:45,988 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-28 03:20:45,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:20:45,999 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 14 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:20:45,999 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [413740020] [2020-11-28 03:20:45,999 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1325613624] [2020-11-28 03:20:45,999 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_d3fe285b-1e29-4e9f-bebc-2a5cb69e71de/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 [2020-11-28 03:20:46,124 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2020-11-28 03:20:46,125 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-28 03:20:46,126 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 41 conjunts are in the unsatisfiable core [2020-11-28 03:20:46,132 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:20:46,145 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 [2020-11-28 03:20:46,145 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-28 03:20:46,149 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-28 03:20:46,149 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2020-11-28 03:20:46,149 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:10, output treesize:9 [2020-11-28 03:20:46,196 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 [2020-11-28 03:20:46,196 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-28 03:20:46,202 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-28 03:20:46,203 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. [2020-11-28 03:20:46,203 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:23, output treesize:19 [2020-11-28 03:20:46,415 INFO L350 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2020-11-28 03:20:46,415 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 [2020-11-28 03:20:46,416 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2020-11-28 03:20:46,429 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-28 03:20:46,430 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-11-28 03:20:46,431 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-11-28 03:20:46,431 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:36, output treesize:29 [2020-11-28 03:20:46,483 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-28 03:20:46,606 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2020-11-28 03:20:46,607 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-28 03:20:46,607 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 9] total 30 [2020-11-28 03:20:46,607 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [147244249] [2020-11-28 03:20:46,608 INFO L461 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-11-28 03:20:46,608 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-28 03:20:46,608 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-11-28 03:20:46,609 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=811, Unknown=0, NotChecked=0, Total=870 [2020-11-28 03:20:46,609 INFO L87 Difference]: Start difference. First operand 50 states and 51 transitions. Second operand 30 states. [2020-11-28 03:20:48,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 03:20:48,934 INFO L93 Difference]: Finished difference Result 77 states and 78 transitions. [2020-11-28 03:20:48,934 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-11-28 03:20:48,934 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 49 [2020-11-28 03:20:48,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 03:20:48,935 INFO L225 Difference]: With dead ends: 77 [2020-11-28 03:20:48,935 INFO L226 Difference]: Without dead ends: 0 [2020-11-28 03:20:48,936 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 594 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=452, Invalid=3838, Unknown=0, NotChecked=0, Total=4290 [2020-11-28 03:20:48,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-11-28 03:20:48,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-11-28 03:20:48,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-11-28 03:20:48,937 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-11-28 03:20:48,937 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 49 [2020-11-28 03:20:48,937 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 03:20:48,937 INFO L481 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-11-28 03:20:48,937 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-11-28 03:20:48,937 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-11-28 03:20:48,937 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-11-28 03:20:49,150 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2020-11-28 03:20:49,154 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 28.11 03:20:49 BoogieIcfgContainer [2020-11-28 03:20:49,154 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-28 03:20:49,154 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-11-28 03:20:49,154 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-11-28 03:20:49,154 INFO L275 PluginConnector]: Witness Printer initialized [2020-11-28 03:20:49,155 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 03:20:31" (3/4) ... [2020-11-28 03:20:49,157 INFO L137 WitnessPrinter]: Generating witness for correct program [2020-11-28 03:20:49,161 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure ULTIMATE.init [2020-11-28 03:20:49,161 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure __bswap_32 [2020-11-28 03:20:49,162 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure __bswap_64 [2020-11-28 03:20:49,162 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure __uint16_identity [2020-11-28 03:20:49,162 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure __uint64_identity [2020-11-28 03:20:49,162 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure main [2020-11-28 03:20:49,162 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure strlen_rec [2020-11-28 03:20:49,162 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure __uint32_identity [2020-11-28 03:20:49,165 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 12 nodes and edges [2020-11-28 03:20:49,165 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 4 nodes and edges [2020-11-28 03:20:49,165 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 2 nodes and edges [2020-11-28 03:20:49,165 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2020-11-28 03:20:49,204 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_d3fe285b-1e29-4e9f-bebc-2a5cb69e71de/bin/uautomizer/witness.graphml [2020-11-28 03:20:49,204 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-11-28 03:20:49,205 INFO L168 Benchmark]: Toolchain (without parser) took 19342.66 ms. Allocated memory was 121.6 MB in the beginning and 285.2 MB in the end (delta: 163.6 MB). Free memory was 87.4 MB in the beginning and 225.9 MB in the end (delta: -138.5 MB). Peak memory consumption was 26.2 MB. Max. memory is 16.1 GB. [2020-11-28 03:20:49,205 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 73.4 MB. Free memory was 31.8 MB in the beginning and 31.8 MB in the end (delta: 33.6 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-28 03:20:49,205 INFO L168 Benchmark]: CACSL2BoogieTranslator took 525.12 ms. Allocated memory is still 121.6 MB. Free memory was 87.1 MB in the beginning and 86.3 MB in the end (delta: 780.2 kB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2020-11-28 03:20:49,206 INFO L168 Benchmark]: Boogie Preprocessor took 46.41 ms. Allocated memory is still 121.6 MB. Free memory was 86.3 MB in the beginning and 83.8 MB in the end (delta: 2.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-28 03:20:49,206 INFO L168 Benchmark]: RCFGBuilder took 647.20 ms. Allocated memory is still 121.6 MB. Free memory was 83.8 MB in the beginning and 46.9 MB in the end (delta: 36.9 MB). Peak memory consumption was 37.7 MB. Max. memory is 16.1 GB. [2020-11-28 03:20:49,207 INFO L168 Benchmark]: TraceAbstraction took 18066.53 ms. Allocated memory was 121.6 MB in the beginning and 285.2 MB in the end (delta: 163.6 MB). Free memory was 46.5 MB in the beginning and 228.6 MB in the end (delta: -182.1 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-28 03:20:49,208 INFO L168 Benchmark]: Witness Printer took 49.84 ms. Allocated memory is still 285.2 MB. Free memory was 228.6 MB in the beginning and 225.9 MB in the end (delta: 2.7 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-28 03:20:49,210 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 73.4 MB. Free memory was 31.8 MB in the beginning and 31.8 MB in the end (delta: 33.6 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 525.12 ms. Allocated memory is still 121.6 MB. Free memory was 87.1 MB in the beginning and 86.3 MB in the end (delta: 780.2 kB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 46.41 ms. Allocated memory is still 121.6 MB. Free memory was 86.3 MB in the beginning and 83.8 MB in the end (delta: 2.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 647.20 ms. Allocated memory is still 121.6 MB. Free memory was 83.8 MB in the beginning and 46.9 MB in the end (delta: 36.9 MB). Peak memory consumption was 37.7 MB. Max. memory is 16.1 GB. * TraceAbstraction took 18066.53 ms. Allocated memory was 121.6 MB in the beginning and 285.2 MB in the end (delta: 163.6 MB). Free memory was 46.5 MB in the beginning and 228.6 MB in the end (delta: -182.1 MB). There was no memory consumed. Max. memory is 16.1 GB. * Witness Printer took 49.84 ms. Allocated memory is still 285.2 MB. Free memory was 228.6 MB in the beginning and 225.9 MB in the end (delta: 2.7 MB). Peak memory consumption was 2.1 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: 17.9s, OverallIterations: 16, TraceHistogramMax: 6, AutomataDifference: 9.0s, 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, 2.8s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 515 GetRequests, 185 SyntacticMatches, 4 SemanticMatches, 326 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1786 ImplicationChecksByTransitivity, 9.4s 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, 5.8s 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...