./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/cstrcat-alloca-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 9ad7fb26 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/config/AutomizerMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/cstrcat-alloca-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU --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 bfd8ca9d9dda86f57445168715d124831c95b647e7c1b1093bb129b0384cce9e --- Real Ultimate output --- This is Ultimate 0.2.1-dev-9ad7fb2 [2021-11-02 22:33:30,786 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-02 22:33:30,788 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-02 22:33:30,843 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-02 22:33:30,844 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-02 22:33:30,853 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-02 22:33:30,856 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-02 22:33:30,860 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-02 22:33:30,863 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-02 22:33:30,869 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-02 22:33:30,871 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-02 22:33:30,873 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-02 22:33:30,873 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-02 22:33:30,876 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-02 22:33:30,880 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-02 22:33:30,883 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-02 22:33:30,884 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-02 22:33:30,885 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-02 22:33:30,891 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-02 22:33:30,895 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-02 22:33:30,896 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-02 22:33:30,898 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-02 22:33:30,900 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-02 22:33:30,901 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-02 22:33:30,905 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-02 22:33:30,905 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-02 22:33:30,906 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-02 22:33:30,907 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-02 22:33:30,908 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-02 22:33:30,909 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-02 22:33:30,909 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-02 22:33:30,910 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-02 22:33:30,912 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-02 22:33:30,913 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-02 22:33:30,914 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-02 22:33:30,914 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-02 22:33:30,915 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-02 22:33:30,916 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-02 22:33:30,916 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-02 22:33:30,917 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-02 22:33:30,918 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-02 22:33:30,919 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/config/svcomp-DerefFreeMemtrack-32bit-Automizer_Default.epf [2021-11-02 22:33:30,946 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-02 22:33:30,946 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-02 22:33:30,946 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-02 22:33:30,947 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-02 22:33:30,948 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-02 22:33:30,948 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-02 22:33:30,948 INFO L138 SettingsManager]: * Use SBE=true [2021-11-02 22:33:30,949 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-02 22:33:30,949 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-02 22:33:30,949 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-02 22:33:30,949 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-02 22:33:30,950 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-02 22:33:30,950 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-02 22:33:30,950 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-02 22:33:30,950 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-02 22:33:30,951 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-11-02 22:33:30,951 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-02 22:33:30,951 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-02 22:33:30,951 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-02 22:33:30,952 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-02 22:33:30,952 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-02 22:33:30,952 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-02 22:33:30,952 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-02 22:33:30,953 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-02 22:33:30,953 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-02 22:33:30,953 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-02 22:33:30,953 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-11-02 22:33:30,954 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-02 22:33:30,954 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-02 22:33:30,954 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_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> bfd8ca9d9dda86f57445168715d124831c95b647e7c1b1093bb129b0384cce9e [2021-11-02 22:33:31,285 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-02 22:33:31,311 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-02 22:33:31,316 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-02 22:33:31,318 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-02 22:33:31,321 INFO L275 PluginConnector]: CDTParser initialized [2021-11-02 22:33:31,322 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/../../sv-benchmarks/c/array-memsafety/cstrcat-alloca-2.i [2021-11-02 22:33:31,418 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/data/090723f00/d883125848e4497d98b2e89efedf59b5/FLAG9869bcd04 [2021-11-02 22:33:32,066 INFO L306 CDTParser]: Found 1 translation units. [2021-11-02 22:33:32,067 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/sv-benchmarks/c/array-memsafety/cstrcat-alloca-2.i [2021-11-02 22:33:32,102 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/data/090723f00/d883125848e4497d98b2e89efedf59b5/FLAG9869bcd04 [2021-11-02 22:33:32,334 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/data/090723f00/d883125848e4497d98b2e89efedf59b5 [2021-11-02 22:33:32,337 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-02 22:33:32,339 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-11-02 22:33:32,341 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-02 22:33:32,341 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-02 22:33:32,346 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-02 22:33:32,347 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.11 10:33:32" (1/1) ... [2021-11-02 22:33:32,348 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5ddaa85a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:33:32, skipping insertion in model container [2021-11-02 22:33:32,349 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.11 10:33:32" (1/1) ... [2021-11-02 22:33:32,358 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-02 22:33:32,401 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-02 22:33:32,775 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-02 22:33:32,783 INFO L203 MainTranslator]: Completed pre-run [2021-11-02 22:33:32,828 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-02 22:33:32,866 INFO L208 MainTranslator]: Completed translation [2021-11-02 22:33:32,867 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:33:32 WrapperNode [2021-11-02 22:33:32,867 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-02 22:33:32,868 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-02 22:33:32,869 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-02 22:33:32,869 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-02 22:33:32,882 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:33:32" (1/1) ... [2021-11-02 22:33:32,883 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:33:32" (1/1) ... [2021-11-02 22:33:32,899 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:33:32" (1/1) ... [2021-11-02 22:33:32,900 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:33:32" (1/1) ... [2021-11-02 22:33:32,928 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:33:32" (1/1) ... [2021-11-02 22:33:32,947 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:33:32" (1/1) ... [2021-11-02 22:33:32,954 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:33:32" (1/1) ... [2021-11-02 22:33:32,966 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-02 22:33:32,985 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-02 22:33:32,986 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-02 22:33:32,986 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-02 22:33:32,988 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:33:32" (1/1) ... [2021-11-02 22:33:32,998 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-02 22:33:33,011 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:33:33,026 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-02 22:33:33,040 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-02 22:33:33,083 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-11-02 22:33:33,084 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-02 22:33:33,084 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_32 [2021-11-02 22:33:33,085 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_64 [2021-11-02 22:33:33,085 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint16_identity [2021-11-02 22:33:33,085 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint32_identity [2021-11-02 22:33:33,085 INFO L138 BoogieDeclarations]: Found implementation of procedure __uint64_identity [2021-11-02 22:33:33,086 INFO L138 BoogieDeclarations]: Found implementation of procedure cstrcat [2021-11-02 22:33:33,087 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-11-02 22:33:33,087 INFO L130 BoogieDeclarations]: Found specification of procedure __ctype_get_mb_cur_max [2021-11-02 22:33:33,087 INFO L130 BoogieDeclarations]: Found specification of procedure atof [2021-11-02 22:33:33,088 INFO L130 BoogieDeclarations]: Found specification of procedure atoi [2021-11-02 22:33:33,089 INFO L130 BoogieDeclarations]: Found specification of procedure atol [2021-11-02 22:33:33,089 INFO L130 BoogieDeclarations]: Found specification of procedure atoll [2021-11-02 22:33:33,089 INFO L130 BoogieDeclarations]: Found specification of procedure strtod [2021-11-02 22:33:33,089 INFO L130 BoogieDeclarations]: Found specification of procedure strtof [2021-11-02 22:33:33,089 INFO L130 BoogieDeclarations]: Found specification of procedure strtold [2021-11-02 22:33:33,090 INFO L130 BoogieDeclarations]: Found specification of procedure strtol [2021-11-02 22:33:33,090 INFO L130 BoogieDeclarations]: Found specification of procedure strtoul [2021-11-02 22:33:33,090 INFO L130 BoogieDeclarations]: Found specification of procedure strtoq [2021-11-02 22:33:33,090 INFO L130 BoogieDeclarations]: Found specification of procedure strtouq [2021-11-02 22:33:33,091 INFO L130 BoogieDeclarations]: Found specification of procedure strtoll [2021-11-02 22:33:33,091 INFO L130 BoogieDeclarations]: Found specification of procedure strtoull [2021-11-02 22:33:33,091 INFO L130 BoogieDeclarations]: Found specification of procedure l64a [2021-11-02 22:33:33,091 INFO L130 BoogieDeclarations]: Found specification of procedure a64l [2021-11-02 22:33:33,091 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_32 [2021-11-02 22:33:33,092 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_64 [2021-11-02 22:33:33,092 INFO L130 BoogieDeclarations]: Found specification of procedure __uint16_identity [2021-11-02 22:33:33,092 INFO L130 BoogieDeclarations]: Found specification of procedure __uint32_identity [2021-11-02 22:33:33,092 INFO L130 BoogieDeclarations]: Found specification of procedure __uint64_identity [2021-11-02 22:33:33,092 INFO L130 BoogieDeclarations]: Found specification of procedure select [2021-11-02 22:33:33,093 INFO L130 BoogieDeclarations]: Found specification of procedure pselect [2021-11-02 22:33:33,093 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_major [2021-11-02 22:33:33,093 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_minor [2021-11-02 22:33:33,093 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_makedev [2021-11-02 22:33:33,094 INFO L130 BoogieDeclarations]: Found specification of procedure random [2021-11-02 22:33:33,094 INFO L130 BoogieDeclarations]: Found specification of procedure srandom [2021-11-02 22:33:33,094 INFO L130 BoogieDeclarations]: Found specification of procedure initstate [2021-11-02 22:33:33,094 INFO L130 BoogieDeclarations]: Found specification of procedure setstate [2021-11-02 22:33:33,094 INFO L130 BoogieDeclarations]: Found specification of procedure random_r [2021-11-02 22:33:33,095 INFO L130 BoogieDeclarations]: Found specification of procedure srandom_r [2021-11-02 22:33:33,095 INFO L130 BoogieDeclarations]: Found specification of procedure initstate_r [2021-11-02 22:33:33,095 INFO L130 BoogieDeclarations]: Found specification of procedure setstate_r [2021-11-02 22:33:33,095 INFO L130 BoogieDeclarations]: Found specification of procedure rand [2021-11-02 22:33:33,095 INFO L130 BoogieDeclarations]: Found specification of procedure srand [2021-11-02 22:33:33,096 INFO L130 BoogieDeclarations]: Found specification of procedure rand_r [2021-11-02 22:33:33,096 INFO L130 BoogieDeclarations]: Found specification of procedure drand48 [2021-11-02 22:33:33,096 INFO L130 BoogieDeclarations]: Found specification of procedure erand48 [2021-11-02 22:33:33,097 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48 [2021-11-02 22:33:33,097 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48 [2021-11-02 22:33:33,097 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48 [2021-11-02 22:33:33,097 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48 [2021-11-02 22:33:33,098 INFO L130 BoogieDeclarations]: Found specification of procedure srand48 [2021-11-02 22:33:33,099 INFO L130 BoogieDeclarations]: Found specification of procedure seed48 [2021-11-02 22:33:33,099 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48 [2021-11-02 22:33:33,099 INFO L130 BoogieDeclarations]: Found specification of procedure drand48_r [2021-11-02 22:33:33,100 INFO L130 BoogieDeclarations]: Found specification of procedure erand48_r [2021-11-02 22:33:33,100 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48_r [2021-11-02 22:33:33,100 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48_r [2021-11-02 22:33:33,101 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48_r [2021-11-02 22:33:33,101 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48_r [2021-11-02 22:33:33,101 INFO L130 BoogieDeclarations]: Found specification of procedure srand48_r [2021-11-02 22:33:33,101 INFO L130 BoogieDeclarations]: Found specification of procedure seed48_r [2021-11-02 22:33:33,102 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48_r [2021-11-02 22:33:33,102 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2021-11-02 22:33:33,102 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2021-11-02 22:33:33,103 INFO L130 BoogieDeclarations]: Found specification of procedure realloc [2021-11-02 22:33:33,104 INFO L130 BoogieDeclarations]: Found specification of procedure free [2021-11-02 22:33:33,106 INFO L130 BoogieDeclarations]: Found specification of procedure alloca [2021-11-02 22:33:33,107 INFO L130 BoogieDeclarations]: Found specification of procedure valloc [2021-11-02 22:33:33,107 INFO L130 BoogieDeclarations]: Found specification of procedure posix_memalign [2021-11-02 22:33:33,108 INFO L130 BoogieDeclarations]: Found specification of procedure aligned_alloc [2021-11-02 22:33:33,108 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-11-02 22:33:33,108 INFO L130 BoogieDeclarations]: Found specification of procedure atexit [2021-11-02 22:33:33,109 INFO L130 BoogieDeclarations]: Found specification of procedure at_quick_exit [2021-11-02 22:33:33,109 INFO L130 BoogieDeclarations]: Found specification of procedure on_exit [2021-11-02 22:33:33,109 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2021-11-02 22:33:33,109 INFO L130 BoogieDeclarations]: Found specification of procedure quick_exit [2021-11-02 22:33:33,110 INFO L130 BoogieDeclarations]: Found specification of procedure _Exit [2021-11-02 22:33:33,110 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2021-11-02 22:33:33,110 INFO L130 BoogieDeclarations]: Found specification of procedure putenv [2021-11-02 22:33:33,111 INFO L130 BoogieDeclarations]: Found specification of procedure setenv [2021-11-02 22:33:33,112 INFO L130 BoogieDeclarations]: Found specification of procedure unsetenv [2021-11-02 22:33:33,112 INFO L130 BoogieDeclarations]: Found specification of procedure clearenv [2021-11-02 22:33:33,112 INFO L130 BoogieDeclarations]: Found specification of procedure mktemp [2021-11-02 22:33:33,112 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemp [2021-11-02 22:33:33,112 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemps [2021-11-02 22:33:33,113 INFO L130 BoogieDeclarations]: Found specification of procedure mkdtemp [2021-11-02 22:33:33,113 INFO L130 BoogieDeclarations]: Found specification of procedure system [2021-11-02 22:33:33,113 INFO L130 BoogieDeclarations]: Found specification of procedure realpath [2021-11-02 22:33:33,113 INFO L130 BoogieDeclarations]: Found specification of procedure bsearch [2021-11-02 22:33:33,114 INFO L130 BoogieDeclarations]: Found specification of procedure qsort [2021-11-02 22:33:33,114 INFO L130 BoogieDeclarations]: Found specification of procedure abs [2021-11-02 22:33:33,114 INFO L130 BoogieDeclarations]: Found specification of procedure labs [2021-11-02 22:33:33,114 INFO L130 BoogieDeclarations]: Found specification of procedure llabs [2021-11-02 22:33:33,114 INFO L130 BoogieDeclarations]: Found specification of procedure div [2021-11-02 22:33:33,115 INFO L130 BoogieDeclarations]: Found specification of procedure ldiv [2021-11-02 22:33:33,115 INFO L130 BoogieDeclarations]: Found specification of procedure lldiv [2021-11-02 22:33:33,115 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt [2021-11-02 22:33:33,115 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt [2021-11-02 22:33:33,115 INFO L130 BoogieDeclarations]: Found specification of procedure gcvt [2021-11-02 22:33:33,116 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt [2021-11-02 22:33:33,116 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt [2021-11-02 22:33:33,116 INFO L130 BoogieDeclarations]: Found specification of procedure qgcvt [2021-11-02 22:33:33,116 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt_r [2021-11-02 22:33:33,116 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt_r [2021-11-02 22:33:33,117 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt_r [2021-11-02 22:33:33,117 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt_r [2021-11-02 22:33:33,118 INFO L130 BoogieDeclarations]: Found specification of procedure mblen [2021-11-02 22:33:33,118 INFO L130 BoogieDeclarations]: Found specification of procedure mbtowc [2021-11-02 22:33:33,118 INFO L130 BoogieDeclarations]: Found specification of procedure wctomb [2021-11-02 22:33:33,118 INFO L130 BoogieDeclarations]: Found specification of procedure mbstowcs [2021-11-02 22:33:33,119 INFO L130 BoogieDeclarations]: Found specification of procedure wcstombs [2021-11-02 22:33:33,119 INFO L130 BoogieDeclarations]: Found specification of procedure rpmatch [2021-11-02 22:33:33,120 INFO L130 BoogieDeclarations]: Found specification of procedure getsubopt [2021-11-02 22:33:33,120 INFO L130 BoogieDeclarations]: Found specification of procedure getloadavg [2021-11-02 22:33:33,120 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-11-02 22:33:33,121 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2021-11-02 22:33:33,121 INFO L130 BoogieDeclarations]: Found specification of procedure cstrcat [2021-11-02 22:33:33,121 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-02 22:33:33,121 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-02 22:33:33,121 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-11-02 22:33:33,122 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-02 22:33:33,122 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-02 22:33:33,122 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-11-02 22:33:33,123 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-02 22:33:33,716 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-02 22:33:33,716 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2021-11-02 22:33:33,718 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.11 10:33:33 BoogieIcfgContainer [2021-11-02 22:33:33,719 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-02 22:33:33,724 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-02 22:33:33,724 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-02 22:33:33,730 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-02 22:33:33,731 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.11 10:33:32" (1/3) ... [2021-11-02 22:33:33,733 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1b7af5a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.11 10:33:33, skipping insertion in model container [2021-11-02 22:33:33,733 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 10:33:32" (2/3) ... [2021-11-02 22:33:33,734 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1b7af5a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.11 10:33:33, skipping insertion in model container [2021-11-02 22:33:33,734 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.11 10:33:33" (3/3) ... [2021-11-02 22:33:33,736 INFO L111 eAbstractionObserver]: Analyzing ICFG cstrcat-alloca-2.i [2021-11-02 22:33:33,752 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-02 22:33:33,752 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 15 error locations. [2021-11-02 22:33:33,829 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-02 22:33:33,836 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-02 22:33:33,838 INFO L340 AbstractCegarLoop]: Starting to check reachability of 15 error locations. [2021-11-02 22:33:33,860 INFO L276 IsEmpty]: Start isEmpty. Operand has 52 states, 30 states have (on average 1.9) internal successors, (57), 45 states have internal predecessors, (57), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:33:33,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-02 22:33:33,871 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:33:33,872 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:33:33,873 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting mainErr8ENSURES_VIOLATIONMEMORY_LEAK === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:33:33,880 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:33:33,880 INFO L85 PathProgramCache]: Analyzing trace with hash 697927889, now seen corresponding path program 1 times [2021-11-02 22:33:33,903 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:33:33,904 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [41036192] [2021-11-02 22:33:33,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:33:33,905 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:33:34,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:34,231 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:33:34,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:34,258 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:33:34,259 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:33:34,259 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [41036192] [2021-11-02 22:33:34,260 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [41036192] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:33:34,260 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:33:34,261 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-02 22:33:34,264 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1446548057] [2021-11-02 22:33:34,272 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-02 22:33:34,274 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:33:34,293 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-02 22:33:34,294 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-02 22:33:34,298 INFO L87 Difference]: Start difference. First operand has 52 states, 30 states have (on average 1.9) internal successors, (57), 45 states have internal predecessors, (57), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 5 states have internal predecessors, (8), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:34,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:33:34,787 INFO L93 Difference]: Finished difference Result 106 states and 122 transitions. [2021-11-02 22:33:34,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-02 22:33:34,790 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 5 states have internal predecessors, (8), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-11-02 22:33:34,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:33:34,815 INFO L225 Difference]: With dead ends: 106 [2021-11-02 22:33:34,815 INFO L226 Difference]: Without dead ends: 99 [2021-11-02 22:33:34,819 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2021-11-02 22:33:34,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2021-11-02 22:33:34,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 49. [2021-11-02 22:33:34,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 29 states have (on average 1.7241379310344827) internal successors, (50), 43 states have internal predecessors, (50), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:33:34,881 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 55 transitions. [2021-11-02 22:33:34,882 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 55 transitions. Word has length 11 [2021-11-02 22:33:34,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:33:34,883 INFO L470 AbstractCegarLoop]: Abstraction has 49 states and 55 transitions. [2021-11-02 22:33:34,883 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 5 states have internal predecessors, (8), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:34,884 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 55 transitions. [2021-11-02 22:33:34,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-02 22:33:34,885 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:33:34,885 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:33:34,885 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-02 22:33:34,885 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting mainErr0REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:33:34,887 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:33:34,888 INFO L85 PathProgramCache]: Analyzing trace with hash 160927933, now seen corresponding path program 1 times [2021-11-02 22:33:34,888 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:33:34,888 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1089905364] [2021-11-02 22:33:34,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:33:34,889 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:33:34,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:35,028 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:33:35,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:35,036 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:33:35,036 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:33:35,037 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1089905364] [2021-11-02 22:33:35,037 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1089905364] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:33:35,037 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:33:35,037 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-02 22:33:35,038 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [512458133] [2021-11-02 22:33:35,039 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-02 22:33:35,039 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:33:35,040 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-02 22:33:35,040 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-02 22:33:35,040 INFO L87 Difference]: Start difference. First operand 49 states and 55 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:35,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:33:35,173 INFO L93 Difference]: Finished difference Result 70 states and 79 transitions. [2021-11-02 22:33:35,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-02 22:33:35,174 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-11-02 22:33:35,174 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:33:35,175 INFO L225 Difference]: With dead ends: 70 [2021-11-02 22:33:35,176 INFO L226 Difference]: Without dead ends: 70 [2021-11-02 22:33:35,176 INFO L786 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 [2021-11-02 22:33:35,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-11-02 22:33:35,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 53. [2021-11-02 22:33:35,183 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 33 states have (on average 1.696969696969697) internal successors, (56), 47 states have internal predecessors, (56), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:33:35,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 61 transitions. [2021-11-02 22:33:35,184 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 61 transitions. Word has length 12 [2021-11-02 22:33:35,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:33:35,185 INFO L470 AbstractCegarLoop]: Abstraction has 53 states and 61 transitions. [2021-11-02 22:33:35,185 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:35,185 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 61 transitions. [2021-11-02 22:33:35,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-02 22:33:35,186 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:33:35,186 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:33:35,186 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-02 22:33:35,187 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting mainErr0REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:33:35,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:33:35,187 INFO L85 PathProgramCache]: Analyzing trace with hash 218186235, now seen corresponding path program 1 times [2021-11-02 22:33:35,188 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:33:35,188 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [216065727] [2021-11-02 22:33:35,188 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:33:35,188 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:33:35,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:35,296 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:33:35,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:35,315 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:33:35,315 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:33:35,316 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [216065727] [2021-11-02 22:33:35,316 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [216065727] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:33:35,316 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:33:35,316 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-02 22:33:35,317 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1280343653] [2021-11-02 22:33:35,317 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-02 22:33:35,317 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:33:35,318 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-02 22:33:35,318 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-02 22:33:35,319 INFO L87 Difference]: Start difference. First operand 53 states and 61 transitions. Second operand has 6 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:35,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:33:35,523 INFO L93 Difference]: Finished difference Result 76 states and 87 transitions. [2021-11-02 22:33:35,523 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-02 22:33:35,524 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-11-02 22:33:35,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:33:35,525 INFO L225 Difference]: With dead ends: 76 [2021-11-02 22:33:35,525 INFO L226 Difference]: Without dead ends: 76 [2021-11-02 22:33:35,526 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-02 22:33:35,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-11-02 22:33:35,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 53. [2021-11-02 22:33:35,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 33 states have (on average 1.696969696969697) internal successors, (56), 47 states have internal predecessors, (56), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:33:35,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 61 transitions. [2021-11-02 22:33:35,533 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 61 transitions. Word has length 12 [2021-11-02 22:33:35,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:33:35,534 INFO L470 AbstractCegarLoop]: Abstraction has 53 states and 61 transitions. [2021-11-02 22:33:35,534 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:35,534 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 61 transitions. [2021-11-02 22:33:35,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-02 22:33:35,535 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:33:35,535 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:33:35,535 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-02 22:33:35,536 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting mainErr0REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:33:35,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:33:35,536 INFO L85 PathProgramCache]: Analyzing trace with hash 220033277, now seen corresponding path program 1 times [2021-11-02 22:33:35,537 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:33:35,537 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [306304551] [2021-11-02 22:33:35,537 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:33:35,537 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:33:35,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:35,612 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:33:35,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:35,625 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:33:35,625 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:33:35,625 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [306304551] [2021-11-02 22:33:35,626 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [306304551] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:33:35,626 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:33:35,626 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-02 22:33:35,626 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [383684996] [2021-11-02 22:33:35,627 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-02 22:33:35,627 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:33:35,628 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-02 22:33:35,628 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-02 22:33:35,628 INFO L87 Difference]: Start difference. First operand 53 states and 61 transitions. Second operand has 4 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:35,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:33:35,737 INFO L93 Difference]: Finished difference Result 51 states and 59 transitions. [2021-11-02 22:33:35,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-02 22:33:35,738 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-11-02 22:33:35,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:33:35,740 INFO L225 Difference]: With dead ends: 51 [2021-11-02 22:33:35,740 INFO L226 Difference]: Without dead ends: 51 [2021-11-02 22:33:35,740 INFO L786 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 [2021-11-02 22:33:35,741 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-11-02 22:33:35,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2021-11-02 22:33:35,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 33 states have (on average 1.6363636363636365) internal successors, (54), 45 states have internal predecessors, (54), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:33:35,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 59 transitions. [2021-11-02 22:33:35,760 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 59 transitions. Word has length 12 [2021-11-02 22:33:35,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:33:35,760 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 59 transitions. [2021-11-02 22:33:35,761 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:35,761 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 59 transitions. [2021-11-02 22:33:35,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-02 22:33:35,762 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:33:35,762 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:33:35,762 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-02 22:33:35,765 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting mainErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:33:35,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:33:35,766 INFO L85 PathProgramCache]: Analyzing trace with hash 220033278, now seen corresponding path program 1 times [2021-11-02 22:33:35,766 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:33:35,767 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [164967494] [2021-11-02 22:33:35,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:33:35,767 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:33:35,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:35,931 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:33:35,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:35,948 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:33:35,949 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:33:35,949 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [164967494] [2021-11-02 22:33:35,949 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [164967494] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:33:35,949 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:33:35,950 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-02 22:33:35,950 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1458926399] [2021-11-02 22:33:35,950 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-02 22:33:35,950 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:33:35,951 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-02 22:33:35,951 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-02 22:33:35,952 INFO L87 Difference]: Start difference. First operand 51 states and 59 transitions. Second operand has 5 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:36,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:33:36,167 INFO L93 Difference]: Finished difference Result 71 states and 81 transitions. [2021-11-02 22:33:36,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-02 22:33:36,169 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-11-02 22:33:36,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:33:36,174 INFO L225 Difference]: With dead ends: 71 [2021-11-02 22:33:36,174 INFO L226 Difference]: Without dead ends: 71 [2021-11-02 22:33:36,175 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-02 22:33:36,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-11-02 22:33:36,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 53. [2021-11-02 22:33:36,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 35 states have (on average 1.6285714285714286) internal successors, (57), 47 states have internal predecessors, (57), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:33:36,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 62 transitions. [2021-11-02 22:33:36,191 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 62 transitions. Word has length 12 [2021-11-02 22:33:36,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:33:36,191 INFO L470 AbstractCegarLoop]: Abstraction has 53 states and 62 transitions. [2021-11-02 22:33:36,191 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:36,191 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 62 transitions. [2021-11-02 22:33:36,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-02 22:33:36,192 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:33:36,192 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:33:36,194 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-02 22:33:36,195 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting mainErr5REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:33:36,195 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:33:36,195 INFO L85 PathProgramCache]: Analyzing trace with hash 32870805, now seen corresponding path program 1 times [2021-11-02 22:33:36,196 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:33:36,196 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [355218482] [2021-11-02 22:33:36,196 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:33:36,196 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:33:36,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:36,294 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:33:36,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:36,304 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:33:36,304 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:33:36,304 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [355218482] [2021-11-02 22:33:36,304 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [355218482] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:33:36,305 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:33:36,305 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-02 22:33:36,305 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2073935495] [2021-11-02 22:33:36,305 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-02 22:33:36,306 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:33:36,306 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-02 22:33:36,306 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-02 22:33:36,306 INFO L87 Difference]: Start difference. First operand 53 states and 62 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:36,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:33:36,406 INFO L93 Difference]: Finished difference Result 59 states and 68 transitions. [2021-11-02 22:33:36,406 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-02 22:33:36,406 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2021-11-02 22:33:36,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:33:36,407 INFO L225 Difference]: With dead ends: 59 [2021-11-02 22:33:36,407 INFO L226 Difference]: Without dead ends: 59 [2021-11-02 22:33:36,407 INFO L786 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 [2021-11-02 22:33:36,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-11-02 22:33:36,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 54. [2021-11-02 22:33:36,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 36 states have (on average 1.6111111111111112) internal successors, (58), 48 states have internal predecessors, (58), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:33:36,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 63 transitions. [2021-11-02 22:33:36,427 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 63 transitions. Word has length 14 [2021-11-02 22:33:36,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:33:36,427 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 63 transitions. [2021-11-02 22:33:36,428 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:36,428 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 63 transitions. [2021-11-02 22:33:36,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-02 22:33:36,429 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:33:36,429 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:33:36,429 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-02 22:33:36,430 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting mainErr2REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:33:36,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:33:36,431 INFO L85 PathProgramCache]: Analyzing trace with hash 32870857, now seen corresponding path program 1 times [2021-11-02 22:33:36,431 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:33:36,431 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1786940923] [2021-11-02 22:33:36,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:33:36,433 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:33:36,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:36,484 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:33:36,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:36,493 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:33:36,494 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:33:36,494 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1786940923] [2021-11-02 22:33:36,494 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1786940923] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:33:36,494 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:33:36,495 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-02 22:33:36,495 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1099434488] [2021-11-02 22:33:36,495 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-02 22:33:36,495 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:33:36,496 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-02 22:33:36,496 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-02 22:33:36,496 INFO L87 Difference]: Start difference. First operand 54 states and 63 transitions. Second operand has 4 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:36,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:33:36,566 INFO L93 Difference]: Finished difference Result 52 states and 61 transitions. [2021-11-02 22:33:36,566 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-02 22:33:36,566 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2021-11-02 22:33:36,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:33:36,567 INFO L225 Difference]: With dead ends: 52 [2021-11-02 22:33:36,567 INFO L226 Difference]: Without dead ends: 52 [2021-11-02 22:33:36,568 INFO L786 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 [2021-11-02 22:33:36,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-11-02 22:33:36,570 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2021-11-02 22:33:36,570 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 36 states have (on average 1.5555555555555556) internal successors, (56), 46 states have internal predecessors, (56), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:33:36,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 61 transitions. [2021-11-02 22:33:36,571 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 61 transitions. Word has length 14 [2021-11-02 22:33:36,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:33:36,571 INFO L470 AbstractCegarLoop]: Abstraction has 52 states and 61 transitions. [2021-11-02 22:33:36,571 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:36,572 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 61 transitions. [2021-11-02 22:33:36,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-02 22:33:36,572 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:33:36,572 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:33:36,572 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-02 22:33:36,573 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:33:36,573 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:33:36,573 INFO L85 PathProgramCache]: Analyzing trace with hash 32870858, now seen corresponding path program 1 times [2021-11-02 22:33:36,573 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:33:36,573 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1271728041] [2021-11-02 22:33:36,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:33:36,574 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:33:36,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:36,653 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:33:36,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:36,658 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:33:36,658 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:33:36,658 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1271728041] [2021-11-02 22:33:36,658 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1271728041] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:33:36,659 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:33:36,659 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-02 22:33:36,659 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [940955737] [2021-11-02 22:33:36,659 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-02 22:33:36,659 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:33:36,660 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-02 22:33:36,660 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-02 22:33:36,660 INFO L87 Difference]: Start difference. First operand 52 states and 61 transitions. Second operand has 7 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 6 states have internal predecessors, (11), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:36,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:33:36,772 INFO L93 Difference]: Finished difference Result 55 states and 64 transitions. [2021-11-02 22:33:36,773 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-02 22:33:36,773 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 6 states have internal predecessors, (11), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2021-11-02 22:33:36,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:33:36,774 INFO L225 Difference]: With dead ends: 55 [2021-11-02 22:33:36,774 INFO L226 Difference]: Without dead ends: 55 [2021-11-02 22:33:36,774 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-02 22:33:36,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-11-02 22:33:36,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 53. [2021-11-02 22:33:36,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 37 states have (on average 1.5405405405405406) internal successors, (57), 47 states have internal predecessors, (57), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:33:36,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 62 transitions. [2021-11-02 22:33:36,778 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 62 transitions. Word has length 14 [2021-11-02 22:33:36,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:33:36,778 INFO L470 AbstractCegarLoop]: Abstraction has 53 states and 62 transitions. [2021-11-02 22:33:36,778 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 6 states have internal predecessors, (11), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:36,778 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 62 transitions. [2021-11-02 22:33:36,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-02 22:33:36,779 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:33:36,779 INFO L513 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:33:36,779 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-02 22:33:36,779 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting mainErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:33:36,780 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:33:36,780 INFO L85 PathProgramCache]: Analyzing trace with hash 1859671169, now seen corresponding path program 1 times [2021-11-02 22:33:36,780 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:33:36,780 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1905793126] [2021-11-02 22:33:36,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:33:36,781 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:33:36,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:36,855 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:33:36,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:36,866 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:33:36,866 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:33:36,866 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1905793126] [2021-11-02 22:33:36,867 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1905793126] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:33:36,867 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [673300821] [2021-11-02 22:33:36,867 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:33:36,867 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:33:36,867 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:33:36,873 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:33:36,893 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-02 22:33:36,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:36,984 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-02 22:33:36,990 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:33:37,141 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-02 22:33:37,142 INFO L388 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 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-02 22:33:37,169 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-02 22:33:37,252 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:33:37,252 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [673300821] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:33:37,253 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:33:37,253 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-11-02 22:33:37,253 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [793987273] [2021-11-02 22:33:37,253 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-02 22:33:37,254 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:33:37,254 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-02 22:33:37,254 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-11-02 22:33:37,255 INFO L87 Difference]: Start difference. First operand 53 states and 62 transitions. Second operand has 7 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 6 states have internal predecessors, (19), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:37,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:33:37,419 INFO L93 Difference]: Finished difference Result 70 states and 80 transitions. [2021-11-02 22:33:37,419 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-02 22:33:37,420 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 6 states have internal predecessors, (19), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 16 [2021-11-02 22:33:37,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:33:37,421 INFO L225 Difference]: With dead ends: 70 [2021-11-02 22:33:37,421 INFO L226 Difference]: Without dead ends: 70 [2021-11-02 22:33:37,421 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-11-02 22:33:37,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-11-02 22:33:37,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 50. [2021-11-02 22:33:37,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 35 states have (on average 1.5142857142857142) internal successors, (53), 44 states have internal predecessors, (53), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:33:37,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 58 transitions. [2021-11-02 22:33:37,425 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 58 transitions. Word has length 16 [2021-11-02 22:33:37,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:33:37,426 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 58 transitions. [2021-11-02 22:33:37,426 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 6 states have internal predecessors, (19), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:37,426 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 58 transitions. [2021-11-02 22:33:37,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-02 22:33:37,427 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:33:37,427 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:33:37,470 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-02 22:33:37,645 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:33:37,645 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting mainErr5REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:33:37,646 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:33:37,646 INFO L85 PathProgramCache]: Analyzing trace with hash 98804632, now seen corresponding path program 1 times [2021-11-02 22:33:37,646 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:33:37,646 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1434338042] [2021-11-02 22:33:37,647 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:33:37,647 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:33:37,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:37,712 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:33:37,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:37,719 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:33:37,719 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:33:37,720 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1434338042] [2021-11-02 22:33:37,720 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1434338042] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:33:37,720 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:33:37,720 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-02 22:33:37,720 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1564852780] [2021-11-02 22:33:37,721 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-02 22:33:37,721 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:33:37,722 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-02 22:33:37,722 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-02 22:33:37,722 INFO L87 Difference]: Start difference. First operand 50 states and 58 transitions. Second operand has 5 states, 4 states have (on average 3.75) internal successors, (15), 4 states have internal predecessors, (15), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:37,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:33:37,810 INFO L93 Difference]: Finished difference Result 49 states and 57 transitions. [2021-11-02 22:33:37,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-02 22:33:37,810 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 3.75) internal successors, (15), 4 states have internal predecessors, (15), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 18 [2021-11-02 22:33:37,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:33:37,811 INFO L225 Difference]: With dead ends: 49 [2021-11-02 22:33:37,811 INFO L226 Difference]: Without dead ends: 49 [2021-11-02 22:33:37,812 INFO L786 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 [2021-11-02 22:33:37,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-11-02 22:33:37,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2021-11-02 22:33:37,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 35 states have (on average 1.4857142857142858) internal successors, (52), 43 states have internal predecessors, (52), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:33:37,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 57 transitions. [2021-11-02 22:33:37,815 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 57 transitions. Word has length 18 [2021-11-02 22:33:37,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:33:37,816 INFO L470 AbstractCegarLoop]: Abstraction has 49 states and 57 transitions. [2021-11-02 22:33:37,816 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 3.75) internal successors, (15), 4 states have internal predecessors, (15), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:37,816 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 57 transitions. [2021-11-02 22:33:37,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-02 22:33:37,817 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:33:37,817 INFO L513 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:33:37,817 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-02 22:33:37,818 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:33:37,818 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:33:37,818 INFO L85 PathProgramCache]: Analyzing trace with hash 98804685, now seen corresponding path program 1 times [2021-11-02 22:33:37,818 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:33:37,819 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1309564211] [2021-11-02 22:33:37,819 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:33:37,819 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:33:37,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:37,872 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:33:37,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:37,877 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:33:37,877 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:33:37,877 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1309564211] [2021-11-02 22:33:37,878 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1309564211] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:33:37,878 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1111063348] [2021-11-02 22:33:37,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:33:37,878 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:33:37,878 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:33:37,880 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:33:37,911 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-02 22:33:38,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:38,011 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-02 22:33:38,013 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:33:38,141 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:33:38,146 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1111063348] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:33:38,147 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-11-02 22:33:38,147 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 8 [2021-11-02 22:33:38,147 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [505232876] [2021-11-02 22:33:38,148 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-02 22:33:38,148 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:33:38,149 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-02 22:33:38,149 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-02 22:33:38,149 INFO L87 Difference]: Start difference. First operand 49 states and 57 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:38,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:33:38,181 INFO L93 Difference]: Finished difference Result 65 states and 74 transitions. [2021-11-02 22:33:38,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-02 22:33:38,181 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 18 [2021-11-02 22:33:38,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:33:38,183 INFO L225 Difference]: With dead ends: 65 [2021-11-02 22:33:38,184 INFO L226 Difference]: Without dead ends: 65 [2021-11-02 22:33:38,184 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-02 22:33:38,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-11-02 22:33:38,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 58. [2021-11-02 22:33:38,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 44 states have (on average 1.4090909090909092) internal successors, (62), 52 states have internal predecessors, (62), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:33:38,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 67 transitions. [2021-11-02 22:33:38,191 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 67 transitions. Word has length 18 [2021-11-02 22:33:38,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:33:38,191 INFO L470 AbstractCegarLoop]: Abstraction has 58 states and 67 transitions. [2021-11-02 22:33:38,192 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:38,192 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 67 transitions. [2021-11-02 22:33:38,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-02 22:33:38,198 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:33:38,198 INFO L513 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:33:38,233 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2021-11-02 22:33:38,412 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-02 22:33:38,413 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting mainErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:33:38,413 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:33:38,413 INFO L85 PathProgramCache]: Analyzing trace with hash 799869263, now seen corresponding path program 1 times [2021-11-02 22:33:38,413 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:33:38,414 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1503184114] [2021-11-02 22:33:38,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:33:38,414 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:33:38,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:38,526 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:33:38,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:38,535 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:33:38,536 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:33:38,536 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1503184114] [2021-11-02 22:33:38,536 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1503184114] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:33:38,536 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1203452556] [2021-11-02 22:33:38,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:33:38,537 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:33:38,537 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:33:38,538 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:33:38,573 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-02 22:33:38,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:38,688 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-02 22:33:38,689 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:33:38,739 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:33:38,739 INFO L388 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-02 22:33:38,858 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:33:38,858 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1203452556] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:33:38,858 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:33:38,858 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-11-02 22:33:38,859 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1985455192] [2021-11-02 22:33:38,859 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-02 22:33:38,859 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:33:38,860 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-02 22:33:38,860 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-11-02 22:33:38,860 INFO L87 Difference]: Start difference. First operand 58 states and 67 transitions. Second operand has 8 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:39,013 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:33:39,014 INFO L93 Difference]: Finished difference Result 59 states and 68 transitions. [2021-11-02 22:33:39,014 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-02 22:33:39,014 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 18 [2021-11-02 22:33:39,015 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:33:39,015 INFO L225 Difference]: With dead ends: 59 [2021-11-02 22:33:39,016 INFO L226 Difference]: Without dead ends: 59 [2021-11-02 22:33:39,016 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-02 22:33:39,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-11-02 22:33:39,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 56. [2021-11-02 22:33:39,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 43 states have (on average 1.3953488372093024) internal successors, (60), 50 states have internal predecessors, (60), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:33:39,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 65 transitions. [2021-11-02 22:33:39,019 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 65 transitions. Word has length 18 [2021-11-02 22:33:39,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:33:39,020 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 65 transitions. [2021-11-02 22:33:39,020 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:39,020 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 65 transitions. [2021-11-02 22:33:39,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-02 22:33:39,021 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:33:39,021 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:33:39,065 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-02 22:33:39,241 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-02 22:33:39,241 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting mainErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:33:39,242 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:33:39,242 INFO L85 PathProgramCache]: Analyzing trace with hash -1232023695, now seen corresponding path program 1 times [2021-11-02 22:33:39,242 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:33:39,242 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [102400917] [2021-11-02 22:33:39,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:33:39,243 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:33:39,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:39,370 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:33:39,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:39,386 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:33:39,386 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:33:39,386 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [102400917] [2021-11-02 22:33:39,387 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [102400917] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:33:39,387 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [18062845] [2021-11-02 22:33:39,387 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:33:39,387 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:33:39,388 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:33:39,396 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:33:39,420 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-02 22:33:39,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:39,537 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-02 22:33:39,540 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:33:39,767 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:33:39,767 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [18062845] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:33:39,767 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:33:39,768 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5] total 10 [2021-11-02 22:33:39,771 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2069783818] [2021-11-02 22:33:39,772 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-02 22:33:39,772 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:33:39,773 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-02 22:33:39,773 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2021-11-02 22:33:39,774 INFO L87 Difference]: Start difference. First operand 56 states and 65 transitions. Second operand has 11 states, 10 states have (on average 2.7) internal successors, (27), 10 states have internal predecessors, (27), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:40,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:33:40,025 INFO L93 Difference]: Finished difference Result 86 states and 97 transitions. [2021-11-02 22:33:40,026 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-02 22:33:40,026 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.7) internal successors, (27), 10 states have internal predecessors, (27), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2021-11-02 22:33:40,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:33:40,026 INFO L225 Difference]: With dead ends: 86 [2021-11-02 22:33:40,027 INFO L226 Difference]: Without dead ends: 86 [2021-11-02 22:33:40,027 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=147, Unknown=0, NotChecked=0, Total=210 [2021-11-02 22:33:40,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-11-02 22:33:40,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 79. [2021-11-02 22:33:40,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 66 states have (on average 1.2878787878787878) internal successors, (85), 73 states have internal predecessors, (85), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:33:40,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 90 transitions. [2021-11-02 22:33:40,032 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 90 transitions. Word has length 19 [2021-11-02 22:33:40,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:33:40,032 INFO L470 AbstractCegarLoop]: Abstraction has 79 states and 90 transitions. [2021-11-02 22:33:40,032 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 2.7) internal successors, (27), 10 states have internal predecessors, (27), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:40,032 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 90 transitions. [2021-11-02 22:33:40,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-02 22:33:40,033 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:33:40,033 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:33:40,082 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-02 22:33:40,234 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:33:40,234 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting mainErr7REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:33:40,234 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:33:40,234 INFO L85 PathProgramCache]: Analyzing trace with hash -530959117, now seen corresponding path program 1 times [2021-11-02 22:33:40,235 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:33:40,235 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1915533888] [2021-11-02 22:33:40,235 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:33:40,235 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:33:40,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:40,395 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:33:40,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:40,400 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:33:40,400 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:33:40,400 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1915533888] [2021-11-02 22:33:40,401 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1915533888] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:33:40,401 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [176529714] [2021-11-02 22:33:40,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:33:40,401 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:33:40,402 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:33:40,407 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:33:40,429 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-02 22:33:40,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:40,575 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-02 22:33:40,576 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:33:40,658 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:33:40,659 INFO L388 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 1 case distinctions, treesize of input 13 treesize of output 18 [2021-11-02 22:33:40,779 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:33:40,779 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [176529714] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:33:40,780 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-11-02 22:33:40,780 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [9] total 10 [2021-11-02 22:33:40,780 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1731861951] [2021-11-02 22:33:40,781 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-02 22:33:40,781 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:33:40,781 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-02 22:33:40,782 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-11-02 22:33:40,782 INFO L87 Difference]: Start difference. First operand 79 states and 90 transitions. Second operand has 4 states, 3 states have (on average 5.333333333333333) internal successors, (16), 4 states have internal predecessors, (16), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:40,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:33:40,798 INFO L93 Difference]: Finished difference Result 78 states and 89 transitions. [2021-11-02 22:33:40,798 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-02 22:33:40,798 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 5.333333333333333) internal successors, (16), 4 states have internal predecessors, (16), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2021-11-02 22:33:40,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:33:40,800 INFO L225 Difference]: With dead ends: 78 [2021-11-02 22:33:40,800 INFO L226 Difference]: Without dead ends: 78 [2021-11-02 22:33:40,800 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-11-02 22:33:40,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-11-02 22:33:40,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 55. [2021-11-02 22:33:40,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 43 states have (on average 1.372093023255814) internal successors, (59), 49 states have internal predecessors, (59), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:33:40,804 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 64 transitions. [2021-11-02 22:33:40,804 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 64 transitions. Word has length 19 [2021-11-02 22:33:40,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:33:40,804 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 64 transitions. [2021-11-02 22:33:40,805 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 5.333333333333333) internal successors, (16), 4 states have internal predecessors, (16), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:40,805 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 64 transitions. [2021-11-02 22:33:40,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-02 22:33:40,806 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:33:40,806 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:33:40,847 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-02 22:33:41,021 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:33:41,021 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting cstrcatErr0REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:33:41,022 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:33:41,022 INFO L85 PathProgramCache]: Analyzing trace with hash 1572671214, now seen corresponding path program 1 times [2021-11-02 22:33:41,022 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:33:41,022 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [147683936] [2021-11-02 22:33:41,022 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:33:41,022 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:33:41,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:41,064 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:33:41,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:41,068 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:33:41,068 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:33:41,068 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [147683936] [2021-11-02 22:33:41,069 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [147683936] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:33:41,069 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:33:41,069 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-02 22:33:41,069 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [240766443] [2021-11-02 22:33:41,070 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-02 22:33:41,070 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:33:41,070 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-02 22:33:41,070 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-02 22:33:41,071 INFO L87 Difference]: Start difference. First operand 55 states and 64 transitions. Second operand has 6 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:41,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:33:41,167 INFO L93 Difference]: Finished difference Result 54 states and 63 transitions. [2021-11-02 22:33:41,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-02 22:33:41,167 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 22 [2021-11-02 22:33:41,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:33:41,168 INFO L225 Difference]: With dead ends: 54 [2021-11-02 22:33:41,168 INFO L226 Difference]: Without dead ends: 54 [2021-11-02 22:33:41,168 INFO L786 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 [2021-11-02 22:33:41,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-11-02 22:33:41,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2021-11-02 22:33:41,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 43 states have (on average 1.3488372093023255) internal successors, (58), 48 states have internal predecessors, (58), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:33:41,171 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 63 transitions. [2021-11-02 22:33:41,171 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 63 transitions. Word has length 22 [2021-11-02 22:33:41,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:33:41,171 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 63 transitions. [2021-11-02 22:33:41,172 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:41,172 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 63 transitions. [2021-11-02 22:33:41,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-02 22:33:41,173 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:33:41,173 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:33:41,173 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-11-02 22:33:41,173 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting cstrcatErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:33:41,174 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:33:41,174 INFO L85 PathProgramCache]: Analyzing trace with hash 1572671215, now seen corresponding path program 1 times [2021-11-02 22:33:41,174 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:33:41,174 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1753982878] [2021-11-02 22:33:41,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:33:41,174 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:33:41,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:41,263 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:33:41,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:41,267 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:33:41,267 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:33:41,268 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1753982878] [2021-11-02 22:33:41,268 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1753982878] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:33:41,268 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1305784397] [2021-11-02 22:33:41,268 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:33:41,268 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:33:41,269 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:33:41,269 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:33:41,315 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-02 22:33:41,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:41,468 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-02 22:33:41,472 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:33:41,539 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:33:41,539 INFO L388 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 1 case distinctions, treesize of input 13 treesize of output 18 [2021-11-02 22:33:41,683 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:33:41,683 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1305784397] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:33:41,684 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-11-02 22:33:41,684 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [8] total 12 [2021-11-02 22:33:41,684 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [164681928] [2021-11-02 22:33:41,686 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-02 22:33:41,686 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:33:41,687 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-02 22:33:41,688 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-11-02 22:33:41,688 INFO L87 Difference]: Start difference. First operand 54 states and 63 transitions. Second operand has 6 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:41,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:33:41,774 INFO L93 Difference]: Finished difference Result 57 states and 67 transitions. [2021-11-02 22:33:41,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-02 22:33:41,774 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 22 [2021-11-02 22:33:41,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:33:41,776 INFO L225 Difference]: With dead ends: 57 [2021-11-02 22:33:41,776 INFO L226 Difference]: Without dead ends: 57 [2021-11-02 22:33:41,779 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2021-11-02 22:33:41,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-11-02 22:33:41,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 55. [2021-11-02 22:33:41,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 44 states have (on average 1.3409090909090908) internal successors, (59), 49 states have internal predecessors, (59), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:33:41,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 64 transitions. [2021-11-02 22:33:41,786 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 64 transitions. Word has length 22 [2021-11-02 22:33:41,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:33:41,786 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 64 transitions. [2021-11-02 22:33:41,786 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 3.6) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:41,786 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 64 transitions. [2021-11-02 22:33:41,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-02 22:33:41,789 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:33:41,790 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:33:41,828 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-02 22:33:42,017 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:33:42,017 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting cstrcatErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:33:42,018 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:33:42,018 INFO L85 PathProgramCache]: Analyzing trace with hash -491449560, now seen corresponding path program 1 times [2021-11-02 22:33:42,018 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:33:42,018 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [796327052] [2021-11-02 22:33:42,018 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:33:42,018 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:33:42,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:42,116 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:33:42,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:42,124 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:33:42,124 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:33:42,124 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [796327052] [2021-11-02 22:33:42,125 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [796327052] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:33:42,125 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1222738439] [2021-11-02 22:33:42,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:33:42,125 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:33:42,125 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:33:42,127 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:33:42,131 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-02 22:33:42,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:42,281 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-02 22:33:42,283 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:33:42,394 INFO L388 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 11 treesize of output 7 [2021-11-02 22:33:42,469 INFO L388 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 [2021-11-02 22:33:42,496 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:33:42,496 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1222738439] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:33:42,496 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-11-02 22:33:42,496 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [8] total 15 [2021-11-02 22:33:42,498 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1775630884] [2021-11-02 22:33:42,499 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-02 22:33:42,499 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:33:42,500 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-02 22:33:42,501 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2021-11-02 22:33:42,501 INFO L87 Difference]: Start difference. First operand 55 states and 64 transitions. Second operand has 8 states, 7 states have (on average 2.857142857142857) internal successors, (20), 7 states have internal predecessors, (20), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:42,597 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:33:42,598 INFO L93 Difference]: Finished difference Result 92 states and 103 transitions. [2021-11-02 22:33:42,605 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-02 22:33:42,606 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.857142857142857) internal successors, (20), 7 states have internal predecessors, (20), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 24 [2021-11-02 22:33:42,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:33:42,607 INFO L225 Difference]: With dead ends: 92 [2021-11-02 22:33:42,607 INFO L226 Difference]: Without dead ends: 92 [2021-11-02 22:33:42,608 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=261, Unknown=0, NotChecked=0, Total=306 [2021-11-02 22:33:42,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-11-02 22:33:42,612 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 82. [2021-11-02 22:33:42,612 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 70 states have (on average 1.2428571428571429) internal successors, (87), 75 states have internal predecessors, (87), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:33:42,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 94 transitions. [2021-11-02 22:33:42,614 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 94 transitions. Word has length 24 [2021-11-02 22:33:42,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:33:42,614 INFO L470 AbstractCegarLoop]: Abstraction has 82 states and 94 transitions. [2021-11-02 22:33:42,614 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.857142857142857) internal successors, (20), 7 states have internal predecessors, (20), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:42,615 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 94 transitions. [2021-11-02 22:33:42,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-02 22:33:42,615 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:33:42,616 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:33:42,654 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-02 22:33:42,832 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-02 22:33:42,833 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting cstrcatErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:33:42,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:33:42,833 INFO L85 PathProgramCache]: Analyzing trace with hash -1512517914, now seen corresponding path program 1 times [2021-11-02 22:33:42,834 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:33:42,834 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [347387862] [2021-11-02 22:33:42,834 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:33:42,834 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:33:42,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:42,958 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:33:42,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:42,970 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:33:42,971 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:33:42,971 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [347387862] [2021-11-02 22:33:42,971 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [347387862] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:33:42,971 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1875596413] [2021-11-02 22:33:42,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:33:42,972 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:33:42,972 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:33:42,973 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:33:42,974 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-02 22:33:43,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:43,180 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-02 22:33:43,182 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:33:43,241 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:33:43,242 INFO L388 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 1 case distinctions, treesize of input 13 treesize of output 18 [2021-11-02 22:33:43,409 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:33:43,409 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1875596413] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:33:43,409 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:33:43,410 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 12 [2021-11-02 22:33:43,410 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [53212356] [2021-11-02 22:33:43,410 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-02 22:33:43,411 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:33:43,411 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-02 22:33:43,412 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=126, Unknown=0, NotChecked=0, Total=156 [2021-11-02 22:33:43,412 INFO L87 Difference]: Start difference. First operand 82 states and 94 transitions. Second operand has 13 states, 12 states have (on average 2.9166666666666665) internal successors, (35), 10 states have internal predecessors, (35), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:43,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:33:43,688 INFO L93 Difference]: Finished difference Result 97 states and 113 transitions. [2021-11-02 22:33:43,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-02 22:33:43,690 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 2.9166666666666665) internal successors, (35), 10 states have internal predecessors, (35), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 24 [2021-11-02 22:33:43,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:33:43,692 INFO L225 Difference]: With dead ends: 97 [2021-11-02 22:33:43,693 INFO L226 Difference]: Without dead ends: 97 [2021-11-02 22:33:43,693 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2021-11-02 22:33:43,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2021-11-02 22:33:43,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 84. [2021-11-02 22:33:43,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 72 states have (on average 1.25) internal successors, (90), 77 states have internal predecessors, (90), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:33:43,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 97 transitions. [2021-11-02 22:33:43,699 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 97 transitions. Word has length 24 [2021-11-02 22:33:43,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:33:43,700 INFO L470 AbstractCegarLoop]: Abstraction has 84 states and 97 transitions. [2021-11-02 22:33:43,700 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 2.9166666666666665) internal successors, (35), 10 states have internal predecessors, (35), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:43,700 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 97 transitions. [2021-11-02 22:33:43,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-02 22:33:43,701 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:33:43,701 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:33:43,744 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-02 22:33:43,926 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-02 22:33:43,926 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting cstrcatErr2REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:33:43,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:33:43,926 INFO L85 PathProgramCache]: Analyzing trace with hash 1944931375, now seen corresponding path program 1 times [2021-11-02 22:33:43,926 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:33:43,927 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [420609872] [2021-11-02 22:33:43,927 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:33:43,927 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:33:43,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:43,972 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:33:43,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:43,986 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:33:43,986 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:33:43,986 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [420609872] [2021-11-02 22:33:43,986 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [420609872] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:33:43,987 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:33:43,987 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-02 22:33:43,987 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1929794240] [2021-11-02 22:33:43,987 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-02 22:33:43,988 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:33:43,988 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-02 22:33:43,988 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-02 22:33:43,989 INFO L87 Difference]: Start difference. First operand 84 states and 97 transitions. Second operand has 7 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:44,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:33:44,113 INFO L93 Difference]: Finished difference Result 83 states and 96 transitions. [2021-11-02 22:33:44,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-02 22:33:44,114 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 25 [2021-11-02 22:33:44,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:33:44,115 INFO L225 Difference]: With dead ends: 83 [2021-11-02 22:33:44,115 INFO L226 Difference]: Without dead ends: 83 [2021-11-02 22:33:44,115 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2021-11-02 22:33:44,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-11-02 22:33:44,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2021-11-02 22:33:44,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 72 states have (on average 1.2361111111111112) internal successors, (89), 76 states have internal predecessors, (89), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:33:44,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 96 transitions. [2021-11-02 22:33:44,120 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 96 transitions. Word has length 25 [2021-11-02 22:33:44,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:33:44,120 INFO L470 AbstractCegarLoop]: Abstraction has 83 states and 96 transitions. [2021-11-02 22:33:44,120 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:44,120 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 96 transitions. [2021-11-02 22:33:44,120 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-02 22:33:44,121 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:33:44,124 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:33:44,124 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-11-02 22:33:44,124 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting cstrcatErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:33:44,125 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:33:44,125 INFO L85 PathProgramCache]: Analyzing trace with hash 1944931376, now seen corresponding path program 1 times [2021-11-02 22:33:44,126 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:33:44,126 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [85728256] [2021-11-02 22:33:44,127 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:33:44,127 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:33:44,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:44,259 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:33:44,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:44,265 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:33:44,266 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:33:44,266 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [85728256] [2021-11-02 22:33:44,266 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [85728256] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:33:44,266 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:33:44,266 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-02 22:33:44,267 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2113617717] [2021-11-02 22:33:44,267 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-02 22:33:44,267 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:33:44,268 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-02 22:33:44,268 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-11-02 22:33:44,269 INFO L87 Difference]: Start difference. First operand 83 states and 96 transitions. Second operand has 9 states, 8 states have (on average 2.625) internal successors, (21), 7 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:44,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:33:44,470 INFO L93 Difference]: Finished difference Result 89 states and 103 transitions. [2021-11-02 22:33:44,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-02 22:33:44,471 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.625) internal successors, (21), 7 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 25 [2021-11-02 22:33:44,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:33:44,472 INFO L225 Difference]: With dead ends: 89 [2021-11-02 22:33:44,472 INFO L226 Difference]: Without dead ends: 89 [2021-11-02 22:33:44,472 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=141, Unknown=0, NotChecked=0, Total=182 [2021-11-02 22:33:44,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-11-02 22:33:44,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 85. [2021-11-02 22:33:44,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 74 states have (on average 1.2297297297297298) internal successors, (91), 78 states have internal predecessors, (91), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:33:44,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 98 transitions. [2021-11-02 22:33:44,477 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 98 transitions. Word has length 25 [2021-11-02 22:33:44,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:33:44,478 INFO L470 AbstractCegarLoop]: Abstraction has 85 states and 98 transitions. [2021-11-02 22:33:44,479 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 2.625) internal successors, (21), 7 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:44,479 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 98 transitions. [2021-11-02 22:33:44,480 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-02 22:33:44,480 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:33:44,480 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:33:44,480 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-11-02 22:33:44,480 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting cstrcatErr4REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:33:44,481 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:33:44,481 INFO L85 PathProgramCache]: Analyzing trace with hash 163330554, now seen corresponding path program 1 times [2021-11-02 22:33:44,481 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:33:44,481 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1535463217] [2021-11-02 22:33:44,481 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:33:44,482 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:33:44,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:44,553 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:33:44,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:44,557 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:33:44,557 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:33:44,557 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1535463217] [2021-11-02 22:33:44,557 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1535463217] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:33:44,558 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:33:44,558 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-02 22:33:44,558 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [701744267] [2021-11-02 22:33:44,558 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-02 22:33:44,558 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:33:44,559 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-02 22:33:44,559 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-02 22:33:44,559 INFO L87 Difference]: Start difference. First operand 85 states and 98 transitions. Second operand has 7 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:44,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:33:44,678 INFO L93 Difference]: Finished difference Result 84 states and 97 transitions. [2021-11-02 22:33:44,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-02 22:33:44,678 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 26 [2021-11-02 22:33:44,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:33:44,679 INFO L225 Difference]: With dead ends: 84 [2021-11-02 22:33:44,679 INFO L226 Difference]: Without dead ends: 84 [2021-11-02 22:33:44,680 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2021-11-02 22:33:44,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-11-02 22:33:44,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2021-11-02 22:33:44,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 74 states have (on average 1.2162162162162162) internal successors, (90), 77 states have internal predecessors, (90), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:33:44,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 97 transitions. [2021-11-02 22:33:44,684 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 97 transitions. Word has length 26 [2021-11-02 22:33:44,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:33:44,684 INFO L470 AbstractCegarLoop]: Abstraction has 84 states and 97 transitions. [2021-11-02 22:33:44,684 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:44,684 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 97 transitions. [2021-11-02 22:33:44,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-02 22:33:44,685 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:33:44,685 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:33:44,685 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-11-02 22:33:44,686 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting cstrcatErr5REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:33:44,686 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:33:44,686 INFO L85 PathProgramCache]: Analyzing trace with hash 163330555, now seen corresponding path program 1 times [2021-11-02 22:33:44,686 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:33:44,687 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [610025339] [2021-11-02 22:33:44,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:33:44,687 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:33:44,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:44,777 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:33:44,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:44,787 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:33:44,787 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:33:44,787 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [610025339] [2021-11-02 22:33:44,787 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [610025339] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:33:44,788 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:33:44,788 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-02 22:33:44,788 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1922607111] [2021-11-02 22:33:44,788 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-02 22:33:44,788 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:33:44,789 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-02 22:33:44,789 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-11-02 22:33:44,789 INFO L87 Difference]: Start difference. First operand 84 states and 97 transitions. Second operand has 9 states, 8 states have (on average 2.75) internal successors, (22), 7 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:44,960 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:33:44,961 INFO L93 Difference]: Finished difference Result 88 states and 102 transitions. [2021-11-02 22:33:44,961 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-02 22:33:44,962 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.75) internal successors, (22), 7 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 26 [2021-11-02 22:33:44,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:33:44,963 INFO L225 Difference]: With dead ends: 88 [2021-11-02 22:33:44,963 INFO L226 Difference]: Without dead ends: 88 [2021-11-02 22:33:44,964 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2021-11-02 22:33:44,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-11-02 22:33:44,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2021-11-02 22:33:44,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 77 states have (on average 1.2077922077922079) internal successors, (93), 80 states have internal predecessors, (93), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:33:44,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 100 transitions. [2021-11-02 22:33:44,968 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 100 transitions. Word has length 26 [2021-11-02 22:33:44,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:33:44,969 INFO L470 AbstractCegarLoop]: Abstraction has 87 states and 100 transitions. [2021-11-02 22:33:44,969 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 2.75) internal successors, (22), 7 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:44,969 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 100 transitions. [2021-11-02 22:33:44,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-02 22:33:44,970 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:33:44,970 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:33:44,970 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2021-11-02 22:33:44,970 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting cstrcatErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:33:44,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:33:44,971 INFO L85 PathProgramCache]: Analyzing trace with hash -1830768289, now seen corresponding path program 2 times [2021-11-02 22:33:44,971 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:33:44,971 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [58648001] [2021-11-02 22:33:44,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:33:44,971 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:33:44,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:45,126 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:33:45,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:45,131 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-02 22:33:45,131 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:33:45,131 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [58648001] [2021-11-02 22:33:45,131 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [58648001] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:33:45,132 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:33:45,132 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-11-02 22:33:45,132 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [532795256] [2021-11-02 22:33:45,132 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-02 22:33:45,132 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:33:45,133 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-02 22:33:45,133 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=90, Unknown=0, NotChecked=0, Total=110 [2021-11-02 22:33:45,133 INFO L87 Difference]: Start difference. First operand 87 states and 100 transitions. Second operand has 11 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:45,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:33:45,442 INFO L93 Difference]: Finished difference Result 105 states and 119 transitions. [2021-11-02 22:33:45,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-02 22:33:45,442 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 26 [2021-11-02 22:33:45,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:33:45,443 INFO L225 Difference]: With dead ends: 105 [2021-11-02 22:33:45,443 INFO L226 Difference]: Without dead ends: 105 [2021-11-02 22:33:45,444 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=70, Invalid=272, Unknown=0, NotChecked=0, Total=342 [2021-11-02 22:33:45,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2021-11-02 22:33:45,447 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 79. [2021-11-02 22:33:45,448 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 69 states have (on average 1.2318840579710144) internal successors, (85), 72 states have internal predecessors, (85), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:33:45,448 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 92 transitions. [2021-11-02 22:33:45,448 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 92 transitions. Word has length 26 [2021-11-02 22:33:45,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:33:45,449 INFO L470 AbstractCegarLoop]: Abstraction has 79 states and 92 transitions. [2021-11-02 22:33:45,449 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:45,449 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 92 transitions. [2021-11-02 22:33:45,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-02 22:33:45,450 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:33:45,450 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:33:45,450 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2021-11-02 22:33:45,450 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting cstrcatErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:33:45,451 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:33:45,451 INFO L85 PathProgramCache]: Analyzing trace with hash 775255265, now seen corresponding path program 1 times [2021-11-02 22:33:45,451 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:33:45,451 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2097916169] [2021-11-02 22:33:45,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:33:45,452 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:33:45,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:45,741 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:33:45,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:45,749 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:33:45,749 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:33:45,749 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2097916169] [2021-11-02 22:33:45,750 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2097916169] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:33:45,750 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [409850957] [2021-11-02 22:33:45,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:33:45,750 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:33:45,750 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:33:45,751 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:33:45,773 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-02 22:33:45,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:45,989 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-02 22:33:45,991 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:33:46,244 INFO L388 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 21 treesize of output 17 [2021-11-02 22:33:46,384 INFO L388 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 [2021-11-02 22:33:46,395 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:33:46,395 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [409850957] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:33:46,396 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:33:46,396 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 18 [2021-11-02 22:33:46,396 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1733482053] [2021-11-02 22:33:46,397 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-02 22:33:46,397 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:33:46,397 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-02 22:33:46,398 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=263, Unknown=0, NotChecked=0, Total=306 [2021-11-02 22:33:46,398 INFO L87 Difference]: Start difference. First operand 79 states and 92 transitions. Second operand has 18 states, 16 states have (on average 2.0625) internal successors, (33), 16 states have internal predecessors, (33), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:47,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:33:47,005 INFO L93 Difference]: Finished difference Result 119 states and 134 transitions. [2021-11-02 22:33:47,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-02 22:33:47,006 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 16 states have (on average 2.0625) internal successors, (33), 16 states have internal predecessors, (33), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 26 [2021-11-02 22:33:47,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:33:47,006 INFO L225 Difference]: With dead ends: 119 [2021-11-02 22:33:47,007 INFO L226 Difference]: Without dead ends: 119 [2021-11-02 22:33:47,007 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 166 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=176, Invalid=816, Unknown=0, NotChecked=0, Total=992 [2021-11-02 22:33:47,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2021-11-02 22:33:47,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 83. [2021-11-02 22:33:47,010 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 73 states have (on average 1.2328767123287672) internal successors, (90), 76 states have internal predecessors, (90), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-02 22:33:47,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 97 transitions. [2021-11-02 22:33:47,011 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 97 transitions. Word has length 26 [2021-11-02 22:33:47,011 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:33:47,011 INFO L470 AbstractCegarLoop]: Abstraction has 83 states and 97 transitions. [2021-11-02 22:33:47,012 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 16 states have (on average 2.0625) internal successors, (33), 16 states have internal predecessors, (33), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:47,012 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 97 transitions. [2021-11-02 22:33:47,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-02 22:33:47,012 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:33:47,012 INFO L513 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:33:47,038 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-02 22:33:47,213 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:33:47,213 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting cstrcatErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:33:47,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:33:47,213 INFO L85 PathProgramCache]: Analyzing trace with hash -417333064, now seen corresponding path program 1 times [2021-11-02 22:33:47,213 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:33:47,213 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [493042462] [2021-11-02 22:33:47,214 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:33:47,214 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:33:47,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:47,352 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:33:47,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:47,356 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:33:47,356 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:33:47,356 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [493042462] [2021-11-02 22:33:47,357 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [493042462] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:33:47,357 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:33:47,357 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-11-02 22:33:47,357 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1860217619] [2021-11-02 22:33:47,357 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-02 22:33:47,358 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:33:47,358 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-02 22:33:47,358 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2021-11-02 22:33:47,358 INFO L87 Difference]: Start difference. First operand 83 states and 97 transitions. Second operand has 10 states, 10 states have (on average 2.5) internal successors, (25), 8 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:47,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:33:47,610 INFO L93 Difference]: Finished difference Result 138 states and 158 transitions. [2021-11-02 22:33:47,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-02 22:33:47,611 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.5) internal successors, (25), 8 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 29 [2021-11-02 22:33:47,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:33:47,612 INFO L225 Difference]: With dead ends: 138 [2021-11-02 22:33:47,612 INFO L226 Difference]: Without dead ends: 138 [2021-11-02 22:33:47,612 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=51, Invalid=189, Unknown=0, NotChecked=0, Total=240 [2021-11-02 22:33:47,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2021-11-02 22:33:47,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 133. [2021-11-02 22:33:47,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 120 states have (on average 1.2083333333333333) internal successors, (145), 124 states have internal predecessors, (145), 6 states have call successors, (6), 6 states have call predecessors, (6), 3 states have return successors, (5), 2 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-02 22:33:47,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 156 transitions. [2021-11-02 22:33:47,618 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 156 transitions. Word has length 29 [2021-11-02 22:33:47,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:33:47,619 INFO L470 AbstractCegarLoop]: Abstraction has 133 states and 156 transitions. [2021-11-02 22:33:47,620 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.5) internal successors, (25), 8 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:47,620 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 156 transitions. [2021-11-02 22:33:47,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-02 22:33:47,621 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:33:47,621 INFO L513 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:33:47,621 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2021-11-02 22:33:47,621 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting cstrcatErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:33:47,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:33:47,622 INFO L85 PathProgramCache]: Analyzing trace with hash 2072195898, now seen corresponding path program 1 times [2021-11-02 22:33:47,622 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:33:47,622 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [698074805] [2021-11-02 22:33:47,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:33:47,622 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:33:47,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:47,771 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:33:47,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:47,775 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:33:47,775 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:33:47,775 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [698074805] [2021-11-02 22:33:47,775 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [698074805] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:33:47,776 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:33:47,776 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-11-02 22:33:47,776 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [340798051] [2021-11-02 22:33:47,776 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-02 22:33:47,776 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:33:47,777 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-02 22:33:47,777 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=108, Unknown=0, NotChecked=0, Total=132 [2021-11-02 22:33:47,777 INFO L87 Difference]: Start difference. First operand 133 states and 156 transitions. Second operand has 12 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 10 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:48,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:33:48,115 INFO L93 Difference]: Finished difference Result 162 states and 184 transitions. [2021-11-02 22:33:48,115 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-02 22:33:48,115 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 10 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 29 [2021-11-02 22:33:48,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:33:48,116 INFO L225 Difference]: With dead ends: 162 [2021-11-02 22:33:48,116 INFO L226 Difference]: Without dead ends: 162 [2021-11-02 22:33:48,117 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=80, Invalid=340, Unknown=0, NotChecked=0, Total=420 [2021-11-02 22:33:48,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2021-11-02 22:33:48,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 137. [2021-11-02 22:33:48,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 122 states have (on average 1.1967213114754098) internal successors, (146), 127 states have internal predecessors, (146), 7 states have call successors, (7), 7 states have call predecessors, (7), 4 states have return successors, (6), 2 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-02 22:33:48,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 159 transitions. [2021-11-02 22:33:48,123 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 159 transitions. Word has length 29 [2021-11-02 22:33:48,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:33:48,123 INFO L470 AbstractCegarLoop]: Abstraction has 137 states and 159 transitions. [2021-11-02 22:33:48,123 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 10 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:48,123 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 159 transitions. [2021-11-02 22:33:48,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-02 22:33:48,124 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:33:48,124 INFO L513 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:33:48,124 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2021-11-02 22:33:48,125 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting cstrcatErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:33:48,125 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:33:48,125 INFO L85 PathProgramCache]: Analyzing trace with hash -2003916680, now seen corresponding path program 1 times [2021-11-02 22:33:48,125 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:33:48,125 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1438360470] [2021-11-02 22:33:48,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:33:48,126 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:33:48,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:48,289 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:33:48,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:48,293 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:33:48,293 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:33:48,293 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1438360470] [2021-11-02 22:33:48,294 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1438360470] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:33:48,294 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:33:48,294 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-11-02 22:33:48,294 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [45434149] [2021-11-02 22:33:48,294 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-02 22:33:48,295 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:33:48,295 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-02 22:33:48,295 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2021-11-02 22:33:48,295 INFO L87 Difference]: Start difference. First operand 137 states and 159 transitions. Second operand has 11 states, 11 states have (on average 2.272727272727273) internal successors, (25), 9 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:48,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:33:48,569 INFO L93 Difference]: Finished difference Result 191 states and 220 transitions. [2021-11-02 22:33:48,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-02 22:33:48,569 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.272727272727273) internal successors, (25), 9 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 29 [2021-11-02 22:33:48,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:33:48,571 INFO L225 Difference]: With dead ends: 191 [2021-11-02 22:33:48,571 INFO L226 Difference]: Without dead ends: 191 [2021-11-02 22:33:48,571 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=56, Invalid=216, Unknown=0, NotChecked=0, Total=272 [2021-11-02 22:33:48,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2021-11-02 22:33:48,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 139. [2021-11-02 22:33:48,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 124 states have (on average 1.2096774193548387) internal successors, (150), 129 states have internal predecessors, (150), 7 states have call successors, (7), 7 states have call predecessors, (7), 4 states have return successors, (6), 2 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-02 22:33:48,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 163 transitions. [2021-11-02 22:33:48,578 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 163 transitions. Word has length 29 [2021-11-02 22:33:48,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:33:48,578 INFO L470 AbstractCegarLoop]: Abstraction has 139 states and 163 transitions. [2021-11-02 22:33:48,579 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.272727272727273) internal successors, (25), 9 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:48,579 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 163 transitions. [2021-11-02 22:33:48,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-02 22:33:48,580 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:33:48,580 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:33:48,580 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2021-11-02 22:33:48,580 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting cstrcatErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:33:48,580 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:33:48,581 INFO L85 PathProgramCache]: Analyzing trace with hash 1008188004, now seen corresponding path program 2 times [2021-11-02 22:33:48,581 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:33:48,581 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1746243431] [2021-11-02 22:33:48,581 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:33:48,581 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:33:48,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:48,737 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:33:48,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:48,742 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:33:48,742 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:33:48,742 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1746243431] [2021-11-02 22:33:48,742 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1746243431] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:33:48,742 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [48745227] [2021-11-02 22:33:48,743 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:33:48,743 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:33:48,743 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:33:48,756 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:33:48,781 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-02 22:33:49,025 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-02 22:33:49,025 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:33:49,026 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-02 22:33:49,028 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:33:49,073 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:33:49,074 INFO L388 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-02 22:33:49,437 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:33:49,437 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [48745227] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:33:49,437 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:33:49,437 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 19 [2021-11-02 22:33:49,438 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [593952874] [2021-11-02 22:33:49,438 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-02 22:33:49,438 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:33:49,439 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-02 22:33:49,439 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=323, Unknown=0, NotChecked=0, Total=380 [2021-11-02 22:33:49,439 INFO L87 Difference]: Start difference. First operand 139 states and 163 transitions. Second operand has 20 states, 19 states have (on average 2.473684210526316) internal successors, (47), 17 states have internal predecessors, (47), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:50,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:33:50,039 INFO L93 Difference]: Finished difference Result 216 states and 251 transitions. [2021-11-02 22:33:50,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-02 22:33:50,049 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 2.473684210526316) internal successors, (47), 17 states have internal predecessors, (47), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 30 [2021-11-02 22:33:50,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:33:50,051 INFO L225 Difference]: With dead ends: 216 [2021-11-02 22:33:50,051 INFO L226 Difference]: Without dead ends: 216 [2021-11-02 22:33:50,052 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 139 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=96, Invalid=504, Unknown=0, NotChecked=0, Total=600 [2021-11-02 22:33:50,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216 states. [2021-11-02 22:33:50,060 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 171. [2021-11-02 22:33:50,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 171 states, 153 states have (on average 1.2156862745098038) internal successors, (186), 160 states have internal predecessors, (186), 8 states have call successors, (8), 8 states have call predecessors, (8), 6 states have return successors, (8), 2 states have call predecessors, (8), 7 states have call successors, (8) [2021-11-02 22:33:50,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 202 transitions. [2021-11-02 22:33:50,063 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 202 transitions. Word has length 30 [2021-11-02 22:33:50,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:33:50,063 INFO L470 AbstractCegarLoop]: Abstraction has 171 states and 202 transitions. [2021-11-02 22:33:50,063 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 2.473684210526316) internal successors, (47), 17 states have internal predecessors, (47), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:50,064 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 202 transitions. [2021-11-02 22:33:50,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-02 22:33:50,065 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:33:50,065 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:33:50,096 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-02 22:33:50,281 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-11-02 22:33:50,281 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting mainErr8ENSURES_VIOLATIONMEMORY_LEAK === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:33:50,281 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:33:50,282 INFO L85 PathProgramCache]: Analyzing trace with hash 1118111750, now seen corresponding path program 1 times [2021-11-02 22:33:50,282 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:33:50,282 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [888916897] [2021-11-02 22:33:50,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:33:50,282 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:33:50,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:50,340 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:33:50,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:50,348 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-11-02 22:33:50,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:50,364 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:33:50,364 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:33:50,364 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [888916897] [2021-11-02 22:33:50,364 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [888916897] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:33:50,364 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-02 22:33:50,364 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-02 22:33:50,364 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1275496229] [2021-11-02 22:33:50,365 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-02 22:33:50,365 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:33:50,365 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-02 22:33:50,366 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-02 22:33:50,366 INFO L87 Difference]: Start difference. First operand 171 states and 202 transitions. Second operand has 6 states, 5 states have (on average 5.4) internal successors, (27), 4 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:33:50,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:33:50,474 INFO L93 Difference]: Finished difference Result 174 states and 205 transitions. [2021-11-02 22:33:50,475 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-02 22:33:50,475 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 5.4) internal successors, (27), 4 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 32 [2021-11-02 22:33:50,476 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:33:50,477 INFO L225 Difference]: With dead ends: 174 [2021-11-02 22:33:50,477 INFO L226 Difference]: Without dead ends: 115 [2021-11-02 22:33:50,477 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-11-02 22:33:50,478 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2021-11-02 22:33:50,481 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 94. [2021-11-02 22:33:50,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 85 states have (on average 1.2117647058823529) internal successors, (103), 87 states have internal predecessors, (103), 5 states have call successors, (5), 5 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:50,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 109 transitions. [2021-11-02 22:33:50,483 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 109 transitions. Word has length 32 [2021-11-02 22:33:50,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:33:50,483 INFO L470 AbstractCegarLoop]: Abstraction has 94 states and 109 transitions. [2021-11-02 22:33:50,484 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 5.4) internal successors, (27), 4 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-02 22:33:50,484 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 109 transitions. [2021-11-02 22:33:50,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-02 22:33:50,485 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:33:50,485 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:33:50,485 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2021-11-02 22:33:50,485 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting cstrcatErr5REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:33:50,486 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:33:50,486 INFO L85 PathProgramCache]: Analyzing trace with hash -1793981897, now seen corresponding path program 1 times [2021-11-02 22:33:50,486 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:33:50,486 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [133628434] [2021-11-02 22:33:50,487 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:33:50,487 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:33:50,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:50,663 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:33:50,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:50,667 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:33:50,667 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:33:50,667 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [133628434] [2021-11-02 22:33:50,668 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [133628434] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:33:50,668 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2039789668] [2021-11-02 22:33:50,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:33:50,668 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:33:50,668 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:33:50,673 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:33:50,697 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-02 22:33:51,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:51,032 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-02 22:33:51,035 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:33:51,082 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:33:51,083 INFO L388 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-02 22:33:51,443 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:33:51,444 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2039789668] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:33:51,444 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:33:51,444 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 19 [2021-11-02 22:33:51,444 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [285529007] [2021-11-02 22:33:51,444 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-02 22:33:51,444 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:33:51,445 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-02 22:33:51,445 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=323, Unknown=0, NotChecked=0, Total=380 [2021-11-02 22:33:51,445 INFO L87 Difference]: Start difference. First operand 94 states and 109 transitions. Second operand has 20 states, 19 states have (on average 2.6842105263157894) internal successors, (51), 17 states have internal predecessors, (51), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:51,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:33:51,792 INFO L93 Difference]: Finished difference Result 124 states and 139 transitions. [2021-11-02 22:33:51,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-02 22:33:51,793 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 2.6842105263157894) internal successors, (51), 17 states have internal predecessors, (51), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2021-11-02 22:33:51,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:33:51,794 INFO L225 Difference]: With dead ends: 124 [2021-11-02 22:33:51,794 INFO L226 Difference]: Without dead ends: 121 [2021-11-02 22:33:51,794 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 139 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=96, Invalid=504, Unknown=0, NotChecked=0, Total=600 [2021-11-02 22:33:51,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2021-11-02 22:33:51,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 110. [2021-11-02 22:33:51,798 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 100 states have (on average 1.19) internal successors, (119), 102 states have internal predecessors, (119), 6 states have call successors, (6), 6 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:51,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 126 transitions. [2021-11-02 22:33:51,799 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 126 transitions. Word has length 32 [2021-11-02 22:33:51,799 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:33:51,800 INFO L470 AbstractCegarLoop]: Abstraction has 110 states and 126 transitions. [2021-11-02 22:33:51,800 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 2.6842105263157894) internal successors, (51), 17 states have internal predecessors, (51), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:51,800 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 126 transitions. [2021-11-02 22:33:51,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-02 22:33:51,801 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:33:51,801 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:33:51,838 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-02 22:33:52,017 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:33:52,017 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting cstrcatErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:33:52,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:33:52,018 INFO L85 PathProgramCache]: Analyzing trace with hash -1793936035, now seen corresponding path program 3 times [2021-11-02 22:33:52,018 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:33:52,018 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1696740705] [2021-11-02 22:33:52,018 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:33:52,018 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:33:52,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:52,479 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:33:52,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:52,484 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:33:52,484 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:33:52,484 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1696740705] [2021-11-02 22:33:52,484 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1696740705] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:33:52,484 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1061394175] [2021-11-02 22:33:52,484 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-02 22:33:52,484 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:33:52,485 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:33:52,489 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:33:52,525 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-02 22:33:52,829 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-02 22:33:52,829 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:33:52,831 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-02 22:33:52,833 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:33:53,103 INFO L388 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 23 treesize of output 19 [2021-11-02 22:33:53,273 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-02 22:33:53,273 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 11 [2021-11-02 22:33:53,304 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:33:53,304 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1061394175] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:33:53,304 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:33:53,304 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 14] total 24 [2021-11-02 22:33:53,305 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [827199979] [2021-11-02 22:33:53,305 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-02 22:33:53,305 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:33:53,306 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-02 22:33:53,306 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=488, Unknown=0, NotChecked=0, Total=552 [2021-11-02 22:33:53,307 INFO L87 Difference]: Start difference. First operand 110 states and 126 transitions. Second operand has 24 states, 23 states have (on average 2.0869565217391304) internal successors, (48), 22 states have internal predecessors, (48), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:54,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:33:54,150 INFO L93 Difference]: Finished difference Result 160 states and 179 transitions. [2021-11-02 22:33:54,151 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-02 22:33:54,151 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 2.0869565217391304) internal successors, (48), 22 states have internal predecessors, (48), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2021-11-02 22:33:54,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:33:54,152 INFO L225 Difference]: With dead ends: 160 [2021-11-02 22:33:54,152 INFO L226 Difference]: Without dead ends: 152 [2021-11-02 22:33:54,153 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 24 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=225, Invalid=1335, Unknown=0, NotChecked=0, Total=1560 [2021-11-02 22:33:54,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2021-11-02 22:33:54,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 124. [2021-11-02 22:33:54,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 113 states have (on average 1.1858407079646018) internal successors, (134), 115 states have internal predecessors, (134), 7 states have call successors, (7), 7 states have call predecessors, (7), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:54,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 142 transitions. [2021-11-02 22:33:54,159 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 142 transitions. Word has length 32 [2021-11-02 22:33:54,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:33:54,160 INFO L470 AbstractCegarLoop]: Abstraction has 124 states and 142 transitions. [2021-11-02 22:33:54,160 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 2.0869565217391304) internal successors, (48), 22 states have internal predecessors, (48), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:54,160 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 142 transitions. [2021-11-02 22:33:54,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-02 22:33:54,161 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:33:54,162 INFO L513 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:33:54,188 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-02 22:33:54,365 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:33:54,365 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting cstrcatErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:33:54,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:33:54,365 INFO L85 PathProgramCache]: Analyzing trace with hash -2076386475, now seen corresponding path program 1 times [2021-11-02 22:33:54,366 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:33:54,366 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [987691946] [2021-11-02 22:33:54,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:33:54,366 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:33:54,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:54,458 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:33:54,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:54,463 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-02 22:33:54,463 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:33:54,463 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [987691946] [2021-11-02 22:33:54,464 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [987691946] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:33:54,464 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1389028978] [2021-11-02 22:33:54,464 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:33:54,464 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:33:54,464 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:33:54,465 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:33:54,491 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-02 22:33:54,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:54,749 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-02 22:33:54,750 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:33:54,893 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-02 22:33:54,893 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1389028978] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:33:54,893 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:33:54,893 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7] total 12 [2021-11-02 22:33:54,893 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2125155405] [2021-11-02 22:33:54,894 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-02 22:33:54,894 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:33:54,894 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-02 22:33:54,894 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2021-11-02 22:33:54,894 INFO L87 Difference]: Start difference. First operand 124 states and 142 transitions. Second operand has 12 states, 12 states have (on average 3.3333333333333335) internal successors, (40), 11 states have internal predecessors, (40), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:55,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:33:55,168 INFO L93 Difference]: Finished difference Result 129 states and 145 transitions. [2021-11-02 22:33:55,168 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-02 22:33:55,168 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.3333333333333335) internal successors, (40), 11 states have internal predecessors, (40), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 33 [2021-11-02 22:33:55,169 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:33:55,170 INFO L225 Difference]: With dead ends: 129 [2021-11-02 22:33:55,170 INFO L226 Difference]: Without dead ends: 129 [2021-11-02 22:33:55,170 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=90, Invalid=290, Unknown=0, NotChecked=0, Total=380 [2021-11-02 22:33:55,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2021-11-02 22:33:55,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 120. [2021-11-02 22:33:55,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 110 states have (on average 1.1727272727272726) internal successors, (129), 112 states have internal predecessors, (129), 6 states have call successors, (6), 6 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:55,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 136 transitions. [2021-11-02 22:33:55,176 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 136 transitions. Word has length 33 [2021-11-02 22:33:55,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:33:55,176 INFO L470 AbstractCegarLoop]: Abstraction has 120 states and 136 transitions. [2021-11-02 22:33:55,177 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.3333333333333335) internal successors, (40), 11 states have internal predecessors, (40), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:55,177 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 136 transitions. [2021-11-02 22:33:55,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-02 22:33:55,178 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:33:55,178 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:33:55,213 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-02 22:33:55,393 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:33:55,393 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting cstrcatErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:33:55,393 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:33:55,394 INFO L85 PathProgramCache]: Analyzing trace with hash 1362988192, now seen corresponding path program 4 times [2021-11-02 22:33:55,394 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:33:55,394 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1210438078] [2021-11-02 22:33:55,394 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:33:55,394 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:33:55,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:55,601 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:33:55,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:55,605 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 1 proven. 23 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:33:55,605 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:33:55,605 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1210438078] [2021-11-02 22:33:55,605 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1210438078] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:33:55,605 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [296062299] [2021-11-02 22:33:55,605 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-02 22:33:55,605 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:33:55,606 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:33:55,617 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:33:55,618 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-02 22:33:55,902 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-02 22:33:55,902 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:33:55,904 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 40 conjunts are in the unsatisfiable core [2021-11-02 22:33:55,906 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:33:55,994 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:33:55,995 INFO L388 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 1 case distinctions, treesize of input 18 treesize of output 23 [2021-11-02 22:33:56,262 INFO L388 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 25 treesize of output 21 [2021-11-02 22:33:56,699 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:33:56,740 INFO L354 Elim1Store]: treesize reduction 6, result has 76.0 percent of original size [2021-11-02 22:33:56,740 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 46 treesize of output 47 [2021-11-02 22:33:57,016 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-02 22:33:57,016 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [296062299] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:33:57,016 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:33:57,017 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 24 [2021-11-02 22:33:57,017 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1154920987] [2021-11-02 22:33:57,017 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-02 22:33:57,017 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:33:57,018 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-02 22:33:57,018 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=543, Unknown=0, NotChecked=0, Total=600 [2021-11-02 22:33:57,018 INFO L87 Difference]: Start difference. First operand 120 states and 136 transitions. Second operand has 25 states, 23 states have (on average 2.347826086956522) internal successors, (54), 22 states have internal predecessors, (54), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:58,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:33:58,813 INFO L93 Difference]: Finished difference Result 173 states and 194 transitions. [2021-11-02 22:33:58,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-02 22:33:58,813 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 23 states have (on average 2.347826086956522) internal successors, (54), 22 states have internal predecessors, (54), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 36 [2021-11-02 22:33:58,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:33:58,815 INFO L225 Difference]: With dead ends: 173 [2021-11-02 22:33:58,815 INFO L226 Difference]: Without dead ends: 173 [2021-11-02 22:33:58,817 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 539 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=277, Invalid=2173, Unknown=0, NotChecked=0, Total=2450 [2021-11-02 22:33:58,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2021-11-02 22:33:58,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 124. [2021-11-02 22:33:58,822 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 114 states have (on average 1.1842105263157894) internal successors, (135), 116 states have internal predecessors, (135), 6 states have call successors, (6), 6 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:58,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 142 transitions. [2021-11-02 22:33:58,824 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 142 transitions. Word has length 36 [2021-11-02 22:33:58,824 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:33:58,824 INFO L470 AbstractCegarLoop]: Abstraction has 124 states and 142 transitions. [2021-11-02 22:33:58,824 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 23 states have (on average 2.347826086956522) internal successors, (54), 22 states have internal predecessors, (54), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:33:58,825 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 142 transitions. [2021-11-02 22:33:58,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-02 22:33:58,826 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:33:58,826 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:33:58,865 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-02 22:33:59,040 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2021-11-02 22:33:59,040 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting cstrcatErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:33:59,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:33:59,040 INFO L85 PathProgramCache]: Analyzing trace with hash 1736805490, now seen corresponding path program 2 times [2021-11-02 22:33:59,040 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:33:59,040 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [812282520] [2021-11-02 22:33:59,041 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:33:59,041 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:33:59,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:59,196 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:33:59,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:33:59,200 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:33:59,200 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:33:59,200 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [812282520] [2021-11-02 22:33:59,200 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [812282520] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:33:59,200 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1505950423] [2021-11-02 22:33:59,201 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:33:59,201 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:33:59,201 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:33:59,213 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:33:59,218 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-02 22:33:59,564 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-02 22:33:59,564 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:33:59,566 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-02 22:33:59,568 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:33:59,808 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:33:59,808 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1505950423] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:33:59,808 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:33:59,808 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9] total 17 [2021-11-02 22:33:59,808 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1953160834] [2021-11-02 22:33:59,809 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-02 22:33:59,809 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:33:59,809 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-02 22:33:59,809 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=263, Unknown=0, NotChecked=0, Total=306 [2021-11-02 22:33:59,810 INFO L87 Difference]: Start difference. First operand 124 states and 142 transitions. Second operand has 18 states, 17 states have (on average 2.8823529411764706) internal successors, (49), 15 states have internal predecessors, (49), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:34:00,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:34:00,202 INFO L93 Difference]: Finished difference Result 141 states and 156 transitions. [2021-11-02 22:34:00,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-02 22:34:00,202 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 2.8823529411764706) internal successors, (49), 15 states have internal predecessors, (49), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 37 [2021-11-02 22:34:00,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:34:00,203 INFO L225 Difference]: With dead ends: 141 [2021-11-02 22:34:00,203 INFO L226 Difference]: Without dead ends: 141 [2021-11-02 22:34:00,204 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=94, Invalid=506, Unknown=0, NotChecked=0, Total=600 [2021-11-02 22:34:00,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2021-11-02 22:34:00,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 129. [2021-11-02 22:34:00,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 119 states have (on average 1.1764705882352942) internal successors, (140), 121 states have internal predecessors, (140), 6 states have call successors, (6), 6 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:34:00,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 147 transitions. [2021-11-02 22:34:00,210 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 147 transitions. Word has length 37 [2021-11-02 22:34:00,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:34:00,210 INFO L470 AbstractCegarLoop]: Abstraction has 129 states and 147 transitions. [2021-11-02 22:34:00,211 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 2.8823529411764706) internal successors, (49), 15 states have internal predecessors, (49), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:34:00,211 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 147 transitions. [2021-11-02 22:34:00,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-02 22:34:00,212 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:34:00,212 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:34:00,238 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-02 22:34:00,417 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-11-02 22:34:00,417 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting cstrcatErr5REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:34:00,417 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:34:00,418 INFO L85 PathProgramCache]: Analyzing trace with hash -133417613, now seen corresponding path program 2 times [2021-11-02 22:34:00,418 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:34:00,418 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2045299499] [2021-11-02 22:34:00,418 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:34:00,418 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:34:00,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:34:00,638 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:34:00,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:34:00,642 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 1 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:34:00,642 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:34:00,642 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2045299499] [2021-11-02 22:34:00,642 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2045299499] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:34:00,642 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1909185116] [2021-11-02 22:34:00,642 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:34:00,642 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:34:00,643 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:34:00,647 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:34:00,669 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-02 22:34:00,985 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2021-11-02 22:34:00,985 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:34:00,986 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-02 22:34:00,987 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:34:01,138 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-02 22:34:01,138 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1909185116] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-02 22:34:01,138 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-11-02 22:34:01,139 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [13] total 15 [2021-11-02 22:34:01,139 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2049783504] [2021-11-02 22:34:01,139 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-02 22:34:01,139 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:34:01,140 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-02 22:34:01,140 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=201, Unknown=0, NotChecked=0, Total=240 [2021-11-02 22:34:01,140 INFO L87 Difference]: Start difference. First operand 129 states and 147 transitions. Second operand has 4 states, 3 states have (on average 8.0) internal successors, (24), 4 states have internal predecessors, (24), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:34:01,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:34:01,167 INFO L93 Difference]: Finished difference Result 129 states and 145 transitions. [2021-11-02 22:34:01,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-02 22:34:01,167 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 8.0) internal successors, (24), 4 states have internal predecessors, (24), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 38 [2021-11-02 22:34:01,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:34:01,168 INFO L225 Difference]: With dead ends: 129 [2021-11-02 22:34:01,168 INFO L226 Difference]: Without dead ends: 126 [2021-11-02 22:34:01,171 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=201, Unknown=0, NotChecked=0, Total=240 [2021-11-02 22:34:01,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2021-11-02 22:34:01,173 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 123. [2021-11-02 22:34:01,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 113 states have (on average 1.1592920353982301) internal successors, (131), 115 states have internal predecessors, (131), 6 states have call successors, (6), 6 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:34:01,175 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 138 transitions. [2021-11-02 22:34:01,175 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 138 transitions. Word has length 38 [2021-11-02 22:34:01,175 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:34:01,176 INFO L470 AbstractCegarLoop]: Abstraction has 123 states and 138 transitions. [2021-11-02 22:34:01,176 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 8.0) internal successors, (24), 4 states have internal predecessors, (24), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:34:01,176 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 138 transitions. [2021-11-02 22:34:01,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-11-02 22:34:01,177 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:34:01,177 INFO L513 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:34:01,204 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-02 22:34:01,389 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-11-02 22:34:01,389 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting cstrcatErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:34:01,389 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:34:01,390 INFO L85 PathProgramCache]: Analyzing trace with hash -133371751, now seen corresponding path program 5 times [2021-11-02 22:34:01,390 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:34:01,390 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1439020581] [2021-11-02 22:34:01,390 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:34:01,390 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:34:01,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:34:02,056 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:34:02,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:34:02,061 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 9 proven. 21 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:34:02,061 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:34:02,061 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1439020581] [2021-11-02 22:34:02,061 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1439020581] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:34:02,061 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [36737646] [2021-11-02 22:34:02,062 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-02 22:34:02,062 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:34:02,062 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:34:02,065 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:34:02,089 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-02 22:34:02,537 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-11-02 22:34:02,537 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:34:02,539 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-02 22:34:02,540 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:34:02,947 INFO L388 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 21 treesize of output 17 [2021-11-02 22:34:03,480 INFO L354 Elim1Store]: treesize reduction 58, result has 17.1 percent of original size [2021-11-02 22:34:03,481 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 44 treesize of output 32 [2021-11-02 22:34:03,492 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 13 proven. 17 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:34:03,492 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [36737646] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:34:03,492 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:34:03,493 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 32 [2021-11-02 22:34:03,493 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1098885559] [2021-11-02 22:34:03,493 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-02 22:34:03,494 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:34:03,494 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-02 22:34:03,495 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=894, Unknown=0, NotChecked=0, Total=992 [2021-11-02 22:34:03,495 INFO L87 Difference]: Start difference. First operand 123 states and 138 transitions. Second operand has 32 states, 30 states have (on average 1.9666666666666666) internal successors, (59), 29 states have internal predecessors, (59), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:34:05,500 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:34:05,500 INFO L93 Difference]: Finished difference Result 181 states and 201 transitions. [2021-11-02 22:34:05,501 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-02 22:34:05,501 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 30 states have (on average 1.9666666666666666) internal successors, (59), 29 states have internal predecessors, (59), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 38 [2021-11-02 22:34:05,501 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:34:05,502 INFO L225 Difference]: With dead ends: 181 [2021-11-02 22:34:05,503 INFO L226 Difference]: Without dead ends: 171 [2021-11-02 22:34:05,504 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 677 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=415, Invalid=2891, Unknown=0, NotChecked=0, Total=3306 [2021-11-02 22:34:05,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2021-11-02 22:34:05,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 139. [2021-11-02 22:34:05,508 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 128 states have (on average 1.1640625) internal successors, (149), 130 states have internal predecessors, (149), 7 states have call successors, (7), 7 states have call predecessors, (7), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:34:05,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 157 transitions. [2021-11-02 22:34:05,510 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 157 transitions. Word has length 38 [2021-11-02 22:34:05,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:34:05,510 INFO L470 AbstractCegarLoop]: Abstraction has 139 states and 157 transitions. [2021-11-02 22:34:05,510 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 30 states have (on average 1.9666666666666666) internal successors, (59), 29 states have internal predecessors, (59), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:34:05,510 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 157 transitions. [2021-11-02 22:34:05,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-02 22:34:05,511 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:34:05,511 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:34:05,548 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-02 22:34:05,727 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-11-02 22:34:05,727 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting cstrcatErr5REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:34:05,727 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:34:05,727 INFO L85 PathProgramCache]: Analyzing trace with hash -667913360, now seen corresponding path program 1 times [2021-11-02 22:34:05,727 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:34:05,728 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [824799059] [2021-11-02 22:34:05,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:34:05,728 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:34:05,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:34:05,931 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:34:05,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:34:05,936 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:34:05,936 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:34:05,936 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [824799059] [2021-11-02 22:34:05,936 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [824799059] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:34:05,937 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1767764450] [2021-11-02 22:34:05,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:34:05,937 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:34:05,937 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:34:05,938 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:34:05,957 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-02 22:34:06,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:34:06,311 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-02 22:34:06,312 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:34:06,371 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:34:06,371 INFO L388 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 1 case distinctions, treesize of input 15 treesize of output 20 [2021-11-02 22:34:06,727 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:34:06,728 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1767764450] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:34:06,728 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:34:06,728 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 10] total 19 [2021-11-02 22:34:06,728 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [589644049] [2021-11-02 22:34:06,729 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-02 22:34:06,729 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:34:06,729 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-02 22:34:06,729 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=331, Unknown=0, NotChecked=0, Total=380 [2021-11-02 22:34:06,730 INFO L87 Difference]: Start difference. First operand 139 states and 157 transitions. Second operand has 20 states, 19 states have (on average 3.1052631578947367) internal successors, (59), 17 states have internal predecessors, (59), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:34:07,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:34:07,328 INFO L93 Difference]: Finished difference Result 164 states and 181 transitions. [2021-11-02 22:34:07,329 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-02 22:34:07,329 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 3.1052631578947367) internal successors, (59), 17 states have internal predecessors, (59), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 40 [2021-11-02 22:34:07,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:34:07,330 INFO L225 Difference]: With dead ends: 164 [2021-11-02 22:34:07,330 INFO L226 Difference]: Without dead ends: 164 [2021-11-02 22:34:07,331 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 106 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=113, Invalid=699, Unknown=0, NotChecked=0, Total=812 [2021-11-02 22:34:07,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2021-11-02 22:34:07,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 151. [2021-11-02 22:34:07,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 151 states, 140 states have (on average 1.1571428571428573) internal successors, (162), 142 states have internal predecessors, (162), 7 states have call successors, (7), 7 states have call predecessors, (7), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:34:07,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 170 transitions. [2021-11-02 22:34:07,337 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 170 transitions. Word has length 40 [2021-11-02 22:34:07,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:34:07,338 INFO L470 AbstractCegarLoop]: Abstraction has 151 states and 170 transitions. [2021-11-02 22:34:07,338 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 3.1052631578947367) internal successors, (59), 17 states have internal predecessors, (59), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:34:07,338 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 170 transitions. [2021-11-02 22:34:07,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-02 22:34:07,339 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:34:07,340 INFO L513 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:34:07,389 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-02 22:34:07,550 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-11-02 22:34:07,550 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting cstrcatErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:34:07,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:34:07,551 INFO L85 PathProgramCache]: Analyzing trace with hash -667267078, now seen corresponding path program 3 times [2021-11-02 22:34:07,551 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:34:07,551 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [570533966] [2021-11-02 22:34:07,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:34:07,551 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:34:07,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:34:07,984 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:34:07,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:34:07,988 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-02 22:34:07,988 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:34:07,988 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [570533966] [2021-11-02 22:34:07,988 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [570533966] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:34:07,988 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [811937740] [2021-11-02 22:34:07,988 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-02 22:34:07,988 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:34:07,989 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:34:07,990 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:34:07,999 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-02 22:34:08,398 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-02 22:34:08,398 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:34:08,400 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 55 conjunts are in the unsatisfiable core [2021-11-02 22:34:08,401 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:34:08,471 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-02 22:34:08,974 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-02 22:34:09,045 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 35 [2021-11-02 22:34:09,642 INFO L354 Elim1Store]: treesize reduction 64, result has 30.4 percent of original size [2021-11-02 22:34:09,642 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 46 treesize of output 56 [2021-11-02 22:34:09,745 INFO L388 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 21 treesize of output 13 [2021-11-02 22:34:09,755 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 4 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:34:09,755 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [811937740] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:34:09,756 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:34:09,756 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 17] total 27 [2021-11-02 22:34:09,756 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [306596297] [2021-11-02 22:34:09,756 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-02 22:34:09,757 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:34:09,757 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-02 22:34:09,757 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=624, Unknown=0, NotChecked=0, Total=702 [2021-11-02 22:34:09,758 INFO L87 Difference]: Start difference. First operand 151 states and 170 transitions. Second operand has 27 states, 26 states have (on average 2.269230769230769) internal successors, (59), 24 states have internal predecessors, (59), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:34:10,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:34:10,944 INFO L93 Difference]: Finished difference Result 264 states and 295 transitions. [2021-11-02 22:34:10,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-02 22:34:10,945 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 2.269230769230769) internal successors, (59), 24 states have internal predecessors, (59), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 41 [2021-11-02 22:34:10,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:34:10,946 INFO L225 Difference]: With dead ends: 264 [2021-11-02 22:34:10,946 INFO L226 Difference]: Without dead ends: 214 [2021-11-02 22:34:10,948 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 30 SyntacticMatches, 3 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 490 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=246, Invalid=1824, Unknown=0, NotChecked=0, Total=2070 [2021-11-02 22:34:10,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2021-11-02 22:34:10,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 203. [2021-11-02 22:34:10,952 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 203 states, 191 states have (on average 1.1361256544502618) internal successors, (217), 193 states have internal predecessors, (217), 8 states have call successors, (8), 8 states have call predecessors, (8), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:34:10,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 203 states to 203 states and 226 transitions. [2021-11-02 22:34:10,959 INFO L78 Accepts]: Start accepts. Automaton has 203 states and 226 transitions. Word has length 41 [2021-11-02 22:34:10,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:34:10,959 INFO L470 AbstractCegarLoop]: Abstraction has 203 states and 226 transitions. [2021-11-02 22:34:10,960 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 26 states have (on average 2.269230769230769) internal successors, (59), 24 states have internal predecessors, (59), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:34:10,961 INFO L276 IsEmpty]: Start isEmpty. Operand 203 states and 226 transitions. [2021-11-02 22:34:10,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-02 22:34:10,962 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:34:10,962 INFO L513 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:34:11,003 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-02 22:34:11,185 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-11-02 22:34:11,185 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting cstrcatErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:34:11,185 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:34:11,186 INFO L85 PathProgramCache]: Analyzing trace with hash -1598291556, now seen corresponding path program 6 times [2021-11-02 22:34:11,186 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:34:11,186 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1776388233] [2021-11-02 22:34:11,186 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:34:11,186 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:34:11,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:34:11,434 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:34:11,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:34:11,441 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 6 proven. 38 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:34:11,441 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:34:11,441 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1776388233] [2021-11-02 22:34:11,441 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1776388233] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:34:11,441 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1351986908] [2021-11-02 22:34:11,441 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-02 22:34:11,442 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:34:11,442 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:34:11,442 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:34:11,444 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-02 22:34:11,910 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2021-11-02 22:34:11,910 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:34:11,911 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-02 22:34:11,912 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:34:11,945 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:34:11,945 INFO L388 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-02 22:34:12,392 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 15 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:34:12,392 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1351986908] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:34:12,393 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:34:12,393 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 28 [2021-11-02 22:34:12,393 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1372073387] [2021-11-02 22:34:12,394 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-02 22:34:12,394 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:34:12,394 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-02 22:34:12,395 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=711, Unknown=0, NotChecked=0, Total=812 [2021-11-02 22:34:12,395 INFO L87 Difference]: Start difference. First operand 203 states and 226 transitions. Second operand has 29 states, 28 states have (on average 2.5357142857142856) internal successors, (71), 26 states have internal predecessors, (71), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:34:13,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:34:13,002 INFO L93 Difference]: Finished difference Result 292 states and 320 transitions. [2021-11-02 22:34:13,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-02 22:34:13,014 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 2.5357142857142856) internal successors, (71), 26 states have internal predecessors, (71), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 42 [2021-11-02 22:34:13,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:34:13,016 INFO L225 Difference]: With dead ends: 292 [2021-11-02 22:34:13,016 INFO L226 Difference]: Without dead ends: 292 [2021-11-02 22:34:13,016 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 316 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=170, Invalid=1090, Unknown=0, NotChecked=0, Total=1260 [2021-11-02 22:34:13,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 292 states. [2021-11-02 22:34:13,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 292 to 209. [2021-11-02 22:34:13,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 209 states, 197 states have (on average 1.1421319796954315) internal successors, (225), 199 states have internal predecessors, (225), 8 states have call successors, (8), 8 states have call predecessors, (8), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:34:13,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 209 states to 209 states and 234 transitions. [2021-11-02 22:34:13,024 INFO L78 Accepts]: Start accepts. Automaton has 209 states and 234 transitions. Word has length 42 [2021-11-02 22:34:13,024 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:34:13,025 INFO L470 AbstractCegarLoop]: Abstraction has 209 states and 234 transitions. [2021-11-02 22:34:13,025 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 28 states have (on average 2.5357142857142856) internal successors, (71), 26 states have internal predecessors, (71), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:34:13,025 INFO L276 IsEmpty]: Start isEmpty. Operand 209 states and 234 transitions. [2021-11-02 22:34:13,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-02 22:34:13,026 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:34:13,026 INFO L513 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:34:13,066 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-02 22:34:13,239 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-11-02 22:34:13,239 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting cstrcatErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:34:13,240 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:34:13,240 INFO L85 PathProgramCache]: Analyzing trace with hash 1640107669, now seen corresponding path program 7 times [2021-11-02 22:34:13,240 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:34:13,240 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [561828932] [2021-11-02 22:34:13,240 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:34:13,240 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:34:13,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:34:14,057 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:34:14,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:34:14,062 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 14 proven. 38 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:34:14,062 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:34:14,062 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [561828932] [2021-11-02 22:34:14,062 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [561828932] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:34:14,062 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1017369610] [2021-11-02 22:34:14,063 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-02 22:34:14,063 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:34:14,063 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:34:14,065 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:34:14,089 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-02 22:34:14,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:34:14,597 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 50 conjunts are in the unsatisfiable core [2021-11-02 22:34:14,598 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:34:15,125 INFO L388 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 21 treesize of output 17 [2021-11-02 22:34:16,251 INFO L354 Elim1Store]: treesize reduction 93, result has 20.5 percent of original size [2021-11-02 22:34:16,252 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 65 treesize of output 59 [2021-11-02 22:34:16,272 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 12 proven. 40 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:34:16,273 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1017369610] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:34:16,273 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:34:16,273 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 38 [2021-11-02 22:34:16,273 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1782643659] [2021-11-02 22:34:16,274 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-02 22:34:16,274 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:34:16,275 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-02 22:34:16,275 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=1279, Unknown=0, NotChecked=0, Total=1406 [2021-11-02 22:34:16,276 INFO L87 Difference]: Start difference. First operand 209 states and 234 transitions. Second operand has 38 states, 36 states have (on average 1.9722222222222223) internal successors, (71), 35 states have internal predecessors, (71), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:34:18,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:34:18,278 INFO L93 Difference]: Finished difference Result 300 states and 333 transitions. [2021-11-02 22:34:18,279 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-02 22:34:18,279 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 36 states have (on average 1.9722222222222223) internal successors, (71), 35 states have internal predecessors, (71), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 44 [2021-11-02 22:34:18,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:34:18,280 INFO L225 Difference]: With dead ends: 300 [2021-11-02 22:34:18,280 INFO L226 Difference]: Without dead ends: 288 [2021-11-02 22:34:18,282 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 906 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=401, Invalid=3505, Unknown=0, NotChecked=0, Total=3906 [2021-11-02 22:34:18,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 288 states. [2021-11-02 22:34:18,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 288 to 241. [2021-11-02 22:34:18,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 241 states, 227 states have (on average 1.1497797356828194) internal successors, (261), 229 states have internal predecessors, (261), 10 states have call successors, (10), 10 states have call predecessors, (10), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:34:18,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 241 states to 241 states and 272 transitions. [2021-11-02 22:34:18,290 INFO L78 Accepts]: Start accepts. Automaton has 241 states and 272 transitions. Word has length 44 [2021-11-02 22:34:18,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:34:18,291 INFO L470 AbstractCegarLoop]: Abstraction has 241 states and 272 transitions. [2021-11-02 22:34:18,291 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 36 states have (on average 1.9722222222222223) internal successors, (71), 35 states have internal predecessors, (71), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:34:18,291 INFO L276 IsEmpty]: Start isEmpty. Operand 241 states and 272 transitions. [2021-11-02 22:34:18,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-02 22:34:18,292 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:34:18,293 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:34:18,333 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-02 22:34:18,509 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-11-02 22:34:18,509 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting cstrcatErr5REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:34:18,509 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:34:18,509 INFO L85 PathProgramCache]: Analyzing trace with hash 1898173420, now seen corresponding path program 2 times [2021-11-02 22:34:18,510 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:34:18,510 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1587203465] [2021-11-02 22:34:18,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:34:18,510 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:34:18,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:34:18,756 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:34:18,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:34:18,760 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 1 proven. 23 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:34:18,760 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:34:18,760 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1587203465] [2021-11-02 22:34:18,761 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1587203465] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:34:18,761 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1641502476] [2021-11-02 22:34:18,761 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:34:18,761 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:34:18,761 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:34:18,769 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:34:18,785 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-02 22:34:19,345 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-02 22:34:19,346 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:34:19,347 INFO L263 TraceCheckSpWp]: Trace formula consists of 230 conjuncts, 40 conjunts are in the unsatisfiable core [2021-11-02 22:34:19,349 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:34:19,391 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:34:19,392 INFO L388 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-02 22:34:19,922 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 6 proven. 18 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:34:19,922 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1641502476] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:34:19,922 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:34:19,922 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 25 [2021-11-02 22:34:19,922 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [919104108] [2021-11-02 22:34:19,923 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-02 22:34:19,923 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:34:19,923 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-02 22:34:19,923 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=570, Unknown=0, NotChecked=0, Total=650 [2021-11-02 22:34:19,923 INFO L87 Difference]: Start difference. First operand 241 states and 272 transitions. Second operand has 26 states, 25 states have (on average 3.16) internal successors, (79), 23 states have internal predecessors, (79), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:34:20,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:34:20,466 INFO L93 Difference]: Finished difference Result 273 states and 302 transitions. [2021-11-02 22:34:20,467 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-02 22:34:20,468 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 3.16) internal successors, (79), 23 states have internal predecessors, (79), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 46 [2021-11-02 22:34:20,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:34:20,469 INFO L225 Difference]: With dead ends: 273 [2021-11-02 22:34:20,469 INFO L226 Difference]: Without dead ends: 256 [2021-11-02 22:34:20,469 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 269 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=137, Invalid=919, Unknown=0, NotChecked=0, Total=1056 [2021-11-02 22:34:20,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2021-11-02 22:34:20,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 245. [2021-11-02 22:34:20,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 245 states, 232 states have (on average 1.1379310344827587) internal successors, (264), 234 states have internal predecessors, (264), 9 states have call successors, (9), 9 states have call predecessors, (9), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:34:20,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 245 states to 245 states and 274 transitions. [2021-11-02 22:34:20,477 INFO L78 Accepts]: Start accepts. Automaton has 245 states and 274 transitions. Word has length 46 [2021-11-02 22:34:20,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:34:20,478 INFO L470 AbstractCegarLoop]: Abstraction has 245 states and 274 transitions. [2021-11-02 22:34:20,478 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 3.16) internal successors, (79), 23 states have internal predecessors, (79), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:34:20,478 INFO L276 IsEmpty]: Start isEmpty. Operand 245 states and 274 transitions. [2021-11-02 22:34:20,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-02 22:34:20,479 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:34:20,479 INFO L513 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:34:20,508 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-02 22:34:20,697 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:34:20,697 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting cstrcatErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:34:20,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:34:20,697 INFO L85 PathProgramCache]: Analyzing trace with hash -1515382440, now seen corresponding path program 8 times [2021-11-02 22:34:20,698 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:34:20,698 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [802422389] [2021-11-02 22:34:20,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:34:20,699 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:34:20,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:34:20,999 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:34:21,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:34:21,006 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 15 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:34:21,006 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:34:21,006 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [802422389] [2021-11-02 22:34:21,006 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [802422389] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:34:21,006 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1783037585] [2021-11-02 22:34:21,006 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:34:21,007 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:34:21,007 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:34:21,008 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:34:21,033 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-02 22:34:21,683 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-02 22:34:21,683 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:34:21,685 INFO L263 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-02 22:34:21,687 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:34:21,726 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:34:21,726 INFO L388 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-02 22:34:22,346 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 28 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:34:22,346 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1783037585] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:34:22,346 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:34:22,347 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 31 [2021-11-02 22:34:22,347 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1572086837] [2021-11-02 22:34:22,347 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-02 22:34:22,347 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:34:22,347 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-02 22:34:22,348 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=872, Unknown=0, NotChecked=0, Total=992 [2021-11-02 22:34:22,348 INFO L87 Difference]: Start difference. First operand 245 states and 274 transitions. Second operand has 32 states, 31 states have (on average 2.6774193548387095) internal successors, (83), 29 states have internal predecessors, (83), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:34:23,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:34:23,265 INFO L93 Difference]: Finished difference Result 352 states and 387 transitions. [2021-11-02 22:34:23,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-02 22:34:23,266 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 31 states have (on average 2.6774193548387095) internal successors, (83), 29 states have internal predecessors, (83), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 48 [2021-11-02 22:34:23,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:34:23,268 INFO L225 Difference]: With dead ends: 352 [2021-11-02 22:34:23,268 INFO L226 Difference]: Without dead ends: 352 [2021-11-02 22:34:23,269 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 457 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=189, Invalid=1371, Unknown=0, NotChecked=0, Total=1560 [2021-11-02 22:34:23,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 352 states. [2021-11-02 22:34:23,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 352 to 251. [2021-11-02 22:34:23,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 251 states, 238 states have (on average 1.1428571428571428) internal successors, (272), 240 states have internal predecessors, (272), 9 states have call successors, (9), 9 states have call predecessors, (9), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:34:23,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 251 states to 251 states and 282 transitions. [2021-11-02 22:34:23,283 INFO L78 Accepts]: Start accepts. Automaton has 251 states and 282 transitions. Word has length 48 [2021-11-02 22:34:23,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:34:23,283 INFO L470 AbstractCegarLoop]: Abstraction has 251 states and 282 transitions. [2021-11-02 22:34:23,283 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 31 states have (on average 2.6774193548387095) internal successors, (83), 29 states have internal predecessors, (83), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:34:23,284 INFO L276 IsEmpty]: Start isEmpty. Operand 251 states and 282 transitions. [2021-11-02 22:34:23,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-02 22:34:23,285 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:34:23,285 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:34:23,331 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-02 22:34:23,505 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable41 [2021-11-02 22:34:23,505 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting cstrcatErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:34:23,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:34:23,506 INFO L85 PathProgramCache]: Analyzing trace with hash -1078891276, now seen corresponding path program 4 times [2021-11-02 22:34:23,506 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:34:23,506 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [218638519] [2021-11-02 22:34:23,506 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:34:23,506 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:34:23,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:34:23,780 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:34:23,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:34:23,785 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-02 22:34:23,785 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:34:23,785 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [218638519] [2021-11-02 22:34:23,785 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [218638519] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:34:23,785 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1295722545] [2021-11-02 22:34:23,785 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-02 22:34:23,786 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:34:23,786 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:34:23,787 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:34:23,806 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-02 22:34:24,753 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-02 22:34:24,753 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:34:24,755 INFO L263 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 61 conjunts are in the unsatisfiable core [2021-11-02 22:34:24,758 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:34:24,812 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:34:24,813 INFO L388 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-02 22:34:25,512 INFO L388 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 24 treesize of output 20 [2021-11-02 22:34:25,629 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-02 22:34:25,629 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 44 treesize of output 43 [2021-11-02 22:34:26,378 INFO L354 Elim1Store]: treesize reduction 54, result has 41.3 percent of original size [2021-11-02 22:34:26,378 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 50 treesize of output 70 [2021-11-02 22:34:26,712 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-02 22:34:26,713 INFO L388 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 30 treesize of output 30 [2021-11-02 22:34:26,978 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 10 proven. 19 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:34:26,978 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1295722545] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:34:26,978 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:34:26,978 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 30 [2021-11-02 22:34:26,978 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1322539629] [2021-11-02 22:34:26,979 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-02 22:34:26,979 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:34:26,979 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-02 22:34:26,980 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=857, Unknown=0, NotChecked=0, Total=930 [2021-11-02 22:34:26,980 INFO L87 Difference]: Start difference. First operand 251 states and 282 transitions. Second operand has 31 states, 29 states have (on average 2.6551724137931036) internal successors, (77), 28 states have internal predecessors, (77), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:34:35,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:34:35,839 INFO L93 Difference]: Finished difference Result 270 states and 298 transitions. [2021-11-02 22:34:35,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-02 22:34:35,840 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 29 states have (on average 2.6551724137931036) internal successors, (77), 28 states have internal predecessors, (77), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 49 [2021-11-02 22:34:35,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:34:35,841 INFO L225 Difference]: With dead ends: 270 [2021-11-02 22:34:35,842 INFO L226 Difference]: Without dead ends: 270 [2021-11-02 22:34:35,843 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 328 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=265, Invalid=2185, Unknown=0, NotChecked=0, Total=2450 [2021-11-02 22:34:35,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 270 states. [2021-11-02 22:34:35,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 270 to 260. [2021-11-02 22:34:35,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 260 states, 247 states have (on average 1.1376518218623481) internal successors, (281), 249 states have internal predecessors, (281), 9 states have call successors, (9), 9 states have call predecessors, (9), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:34:35,851 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 260 states to 260 states and 291 transitions. [2021-11-02 22:34:35,852 INFO L78 Accepts]: Start accepts. Automaton has 260 states and 291 transitions. Word has length 49 [2021-11-02 22:34:35,852 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:34:35,852 INFO L470 AbstractCegarLoop]: Abstraction has 260 states and 291 transitions. [2021-11-02 22:34:35,852 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 29 states have (on average 2.6551724137931036) internal successors, (77), 28 states have internal predecessors, (77), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:34:35,853 INFO L276 IsEmpty]: Start isEmpty. Operand 260 states and 291 transitions. [2021-11-02 22:34:35,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-02 22:34:35,854 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:34:35,854 INFO L513 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:34:35,900 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-11-02 22:34:36,081 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:34:36,081 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting cstrcatErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:34:36,081 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:34:36,081 INFO L85 PathProgramCache]: Analyzing trace with hash -288610479, now seen corresponding path program 9 times [2021-11-02 22:34:36,082 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:34:36,082 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1246303967] [2021-11-02 22:34:36,082 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:34:36,082 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:34:36,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:34:37,240 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:34:37,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:34:37,255 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 21 proven. 59 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:34:37,255 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:34:37,255 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1246303967] [2021-11-02 22:34:37,255 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1246303967] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:34:37,256 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [791247707] [2021-11-02 22:34:37,256 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-02 22:34:37,256 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:34:37,256 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:34:37,269 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:34:37,270 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-02 22:34:38,261 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-02 22:34:38,262 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:34:38,265 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 69 conjunts are in the unsatisfiable core [2021-11-02 22:34:38,267 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:34:39,298 INFO L388 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 33 treesize of output 29 [2021-11-02 22:34:40,270 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-02 22:34:40,271 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 47 treesize of output 23 [2021-11-02 22:34:40,284 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 15 proven. 65 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:34:40,284 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [791247707] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:34:40,284 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:34:40,284 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 43 [2021-11-02 22:34:40,285 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1808771055] [2021-11-02 22:34:40,285 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-11-02 22:34:40,285 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:34:40,286 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-11-02 22:34:40,287 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=199, Invalid=1607, Unknown=0, NotChecked=0, Total=1806 [2021-11-02 22:34:40,287 INFO L87 Difference]: Start difference. First operand 260 states and 291 transitions. Second operand has 43 states, 42 states have (on average 2.0) internal successors, (84), 41 states have internal predecessors, (84), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:34:42,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:34:42,952 INFO L93 Difference]: Finished difference Result 390 states and 433 transitions. [2021-11-02 22:34:42,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-11-02 22:34:42,952 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 42 states have (on average 2.0) internal successors, (84), 41 states have internal predecessors, (84), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 50 [2021-11-02 22:34:42,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:34:42,955 INFO L225 Difference]: With dead ends: 390 [2021-11-02 22:34:42,956 INFO L226 Difference]: Without dead ends: 373 [2021-11-02 22:34:42,958 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 30 SyntacticMatches, 4 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1822 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=599, Invalid=5563, Unknown=0, NotChecked=0, Total=6162 [2021-11-02 22:34:42,959 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 373 states. [2021-11-02 22:34:42,963 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 373 to 296. [2021-11-02 22:34:42,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 296 states, 281 states have (on average 1.1459074733096086) internal successors, (322), 283 states have internal predecessors, (322), 11 states have call successors, (11), 11 states have call predecessors, (11), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:34:42,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 296 states to 296 states and 334 transitions. [2021-11-02 22:34:42,965 INFO L78 Accepts]: Start accepts. Automaton has 296 states and 334 transitions. Word has length 50 [2021-11-02 22:34:42,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:34:42,965 INFO L470 AbstractCegarLoop]: Abstraction has 296 states and 334 transitions. [2021-11-02 22:34:42,966 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 42 states have (on average 2.0) internal successors, (84), 41 states have internal predecessors, (84), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:34:42,966 INFO L276 IsEmpty]: Start isEmpty. Operand 296 states and 334 transitions. [2021-11-02 22:34:42,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-02 22:34:42,967 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:34:42,967 INFO L513 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:34:43,000 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Ended with exit code 0 [2021-11-02 22:34:43,185 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable43 [2021-11-02 22:34:43,185 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting cstrcatErr5REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:34:43,185 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:34:43,186 INFO L85 PathProgramCache]: Analyzing trace with hash -195209432, now seen corresponding path program 3 times [2021-11-02 22:34:43,186 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:34:43,186 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [907679822] [2021-11-02 22:34:43,186 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:34:43,186 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:34:43,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:34:43,516 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:34:43,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:34:43,521 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 6 proven. 37 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:34:43,521 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:34:43,521 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [907679822] [2021-11-02 22:34:43,521 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [907679822] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:34:43,521 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [946418781] [2021-11-02 22:34:43,521 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-02 22:34:43,521 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:34:43,522 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:34:43,523 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:34:43,542 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-02 22:34:44,758 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-02 22:34:44,758 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:34:44,760 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 49 conjunts are in the unsatisfiable core [2021-11-02 22:34:44,762 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:34:44,825 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:34:44,826 INFO L388 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 1 case distinctions, treesize of input 15 treesize of output 20 [2021-11-02 22:34:45,149 INFO L388 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 25 treesize of output 21 [2021-11-02 22:34:45,728 INFO L354 Elim1Store]: treesize reduction 2, result has 93.5 percent of original size [2021-11-02 22:34:45,728 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 47 treesize of output 60 [2021-11-02 22:34:46,317 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-02 22:34:46,318 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [946418781] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:34:46,318 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:34:46,318 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 30 [2021-11-02 22:34:46,318 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [826500242] [2021-11-02 22:34:46,318 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-02 22:34:46,318 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:34:46,319 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-02 22:34:46,319 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=846, Unknown=0, NotChecked=0, Total=930 [2021-11-02 22:34:46,320 INFO L87 Difference]: Start difference. First operand 296 states and 334 transitions. Second operand has 31 states, 29 states have (on average 2.7586206896551726) internal successors, (80), 28 states have internal predecessors, (80), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:34:59,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:34:59,609 INFO L93 Difference]: Finished difference Result 388 states and 425 transitions. [2021-11-02 22:34:59,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-11-02 22:34:59,610 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 29 states have (on average 2.7586206896551726) internal successors, (80), 28 states have internal predecessors, (80), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 52 [2021-11-02 22:34:59,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:34:59,612 INFO L225 Difference]: With dead ends: 388 [2021-11-02 22:34:59,613 INFO L226 Difference]: Without dead ends: 369 [2021-11-02 22:34:59,616 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1772 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=715, Invalid=6255, Unknown=2, NotChecked=0, Total=6972 [2021-11-02 22:34:59,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 369 states. [2021-11-02 22:34:59,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 369 to 312. [2021-11-02 22:34:59,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 312 states, 297 states have (on average 1.1346801346801347) internal successors, (337), 299 states have internal predecessors, (337), 11 states have call successors, (11), 11 states have call predecessors, (11), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:34:59,627 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 312 states to 312 states and 349 transitions. [2021-11-02 22:34:59,627 INFO L78 Accepts]: Start accepts. Automaton has 312 states and 349 transitions. Word has length 52 [2021-11-02 22:34:59,627 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:34:59,627 INFO L470 AbstractCegarLoop]: Abstraction has 312 states and 349 transitions. [2021-11-02 22:34:59,628 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 29 states have (on average 2.7586206896551726) internal successors, (80), 28 states have internal predecessors, (80), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:34:59,628 INFO L276 IsEmpty]: Start isEmpty. Operand 312 states and 349 transitions. [2021-11-02 22:34:59,629 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-02 22:34:59,630 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:34:59,630 INFO L513 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:34:59,671 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2021-11-02 22:34:59,854 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:34:59,854 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting cstrcatErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:34:59,854 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:34:59,855 INFO L85 PathProgramCache]: Analyzing trace with hash 2124291964, now seen corresponding path program 5 times [2021-11-02 22:34:59,855 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:34:59,855 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1579277758] [2021-11-02 22:34:59,855 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:34:59,855 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:34:59,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:00,480 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:35:00,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:00,498 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 6 proven. 33 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:35:00,498 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:35:00,499 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1579277758] [2021-11-02 22:35:00,499 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1579277758] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:35:00,499 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [359524394] [2021-11-02 22:35:00,499 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-02 22:35:00,499 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:35:00,499 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:35:00,511 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:35:00,541 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-11-02 22:35:01,419 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-11-02 22:35:01,420 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:35:01,423 INFO L263 TraceCheckSpWp]: Trace formula consists of 271 conjuncts, 65 conjunts are in the unsatisfiable core [2021-11-02 22:35:01,425 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:35:01,457 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-02 22:35:02,054 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-02 22:35:02,116 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 35 [2021-11-02 22:35:02,772 INFO L354 Elim1Store]: treesize reduction 18, result has 50.0 percent of original size [2021-11-02 22:35:02,773 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 43 treesize of output 53 [2021-11-02 22:35:02,936 INFO L354 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2021-11-02 22:35:02,936 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 22 [2021-11-02 22:35:02,954 INFO L388 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 [2021-11-02 22:35:02,967 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 7 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:35:02,967 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [359524394] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:35:02,967 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:35:02,967 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 21] total 37 [2021-11-02 22:35:02,967 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1537576780] [2021-11-02 22:35:02,969 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-11-02 22:35:02,969 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:35:02,970 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-11-02 22:35:02,971 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1225, Unknown=0, NotChecked=0, Total=1332 [2021-11-02 22:35:02,971 INFO L87 Difference]: Start difference. First operand 312 states and 349 transitions. Second operand has 37 states, 36 states have (on average 2.361111111111111) internal successors, (85), 34 states have internal predecessors, (85), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:35:05,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:35:05,264 INFO L93 Difference]: Finished difference Result 339 states and 374 transitions. [2021-11-02 22:35:05,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-02 22:35:05,265 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 36 states have (on average 2.361111111111111) internal successors, (85), 34 states have internal predecessors, (85), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 53 [2021-11-02 22:35:05,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:35:05,266 INFO L225 Difference]: With dead ends: 339 [2021-11-02 22:35:05,266 INFO L226 Difference]: Without dead ends: 299 [2021-11-02 22:35:05,268 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 40 SyntacticMatches, 2 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 663 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=349, Invalid=3191, Unknown=0, NotChecked=0, Total=3540 [2021-11-02 22:35:05,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 299 states. [2021-11-02 22:35:05,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 299 to 296. [2021-11-02 22:35:05,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 296 states, 283 states have (on average 1.127208480565371) internal successors, (319), 285 states have internal predecessors, (319), 9 states have call successors, (9), 9 states have call predecessors, (9), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:35:05,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 296 states to 296 states and 329 transitions. [2021-11-02 22:35:05,275 INFO L78 Accepts]: Start accepts. Automaton has 296 states and 329 transitions. Word has length 53 [2021-11-02 22:35:05,275 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:35:05,275 INFO L470 AbstractCegarLoop]: Abstraction has 296 states and 329 transitions. [2021-11-02 22:35:05,276 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 36 states have (on average 2.361111111111111) internal successors, (85), 34 states have internal predecessors, (85), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:35:05,276 INFO L276 IsEmpty]: Start isEmpty. Operand 296 states and 329 transitions. [2021-11-02 22:35:05,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-02 22:35:05,277 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:35:05,277 INFO L513 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:35:05,324 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2021-11-02 22:35:05,505 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:35:05,505 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting cstrcatErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:35:05,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:35:05,505 INFO L85 PathProgramCache]: Analyzing trace with hash -1608068140, now seen corresponding path program 10 times [2021-11-02 22:35:05,505 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:35:05,506 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [121618083] [2021-11-02 22:35:05,506 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:05,506 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:35:05,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:05,873 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:35:05,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:05,877 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 28 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:35:05,877 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:35:05,877 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [121618083] [2021-11-02 22:35:05,877 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [121618083] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:35:05,877 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [588841750] [2021-11-02 22:35:05,877 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-02 22:35:05,877 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:35:05,878 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:35:05,879 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:35:05,897 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-11-02 22:35:07,125 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-02 22:35:07,125 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:35:07,127 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 61 conjunts are in the unsatisfiable core [2021-11-02 22:35:07,128 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:35:07,210 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:35:07,211 INFO L388 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 1 case distinctions, treesize of input 18 treesize of output 23 [2021-11-02 22:35:07,516 INFO L388 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 25 treesize of output 21 [2021-11-02 22:35:08,659 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:35:08,665 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:35:08,666 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:35:08,667 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:35:08,667 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:35:08,668 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:35:08,669 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:35:08,670 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:35:08,671 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:35:08,672 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:35:08,702 INFO L354 Elim1Store]: treesize reduction 24, result has 62.5 percent of original size [2021-11-02 22:35:08,703 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 76 treesize of output 80 [2021-11-02 22:35:08,937 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-02 22:35:08,937 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [588841750] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:35:08,938 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:35:08,938 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 36 [2021-11-02 22:35:08,938 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [563785017] [2021-11-02 22:35:08,938 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-11-02 22:35:08,938 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:35:08,939 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-11-02 22:35:08,940 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1236, Unknown=0, NotChecked=0, Total=1332 [2021-11-02 22:35:08,940 INFO L87 Difference]: Start difference. First operand 296 states and 329 transitions. Second operand has 37 states, 35 states have (on average 2.2285714285714286) internal successors, (78), 34 states have internal predecessors, (78), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:35:17,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:35:17,459 INFO L93 Difference]: Finished difference Result 433 states and 473 transitions. [2021-11-02 22:35:17,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-11-02 22:35:17,459 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 35 states have (on average 2.2285714285714286) internal successors, (78), 34 states have internal predecessors, (78), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 54 [2021-11-02 22:35:17,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:35:17,461 INFO L225 Difference]: With dead ends: 433 [2021-11-02 22:35:17,461 INFO L226 Difference]: Without dead ends: 433 [2021-11-02 22:35:17,463 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1971 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=569, Invalid=6741, Unknown=0, NotChecked=0, Total=7310 [2021-11-02 22:35:17,464 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 433 states. [2021-11-02 22:35:17,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 433 to 302. [2021-11-02 22:35:17,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 302 states, 289 states have (on average 1.1314878892733564) internal successors, (327), 291 states have internal predecessors, (327), 9 states have call successors, (9), 9 states have call predecessors, (9), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:35:17,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 302 states to 302 states and 337 transitions. [2021-11-02 22:35:17,473 INFO L78 Accepts]: Start accepts. Automaton has 302 states and 337 transitions. Word has length 54 [2021-11-02 22:35:17,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:35:17,474 INFO L470 AbstractCegarLoop]: Abstraction has 302 states and 337 transitions. [2021-11-02 22:35:17,474 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 35 states have (on average 2.2285714285714286) internal successors, (78), 34 states have internal predecessors, (78), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:35:17,474 INFO L276 IsEmpty]: Start isEmpty. Operand 302 states and 337 transitions. [2021-11-02 22:35:17,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-02 22:35:17,475 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:35:17,476 INFO L513 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:35:17,515 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2021-11-02 22:35:17,698 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:35:17,698 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting cstrcatErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:35:17,698 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:35:17,698 INFO L85 PathProgramCache]: Analyzing trace with hash 834745037, now seen corresponding path program 11 times [2021-11-02 22:35:17,698 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:35:17,698 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [614610535] [2021-11-02 22:35:17,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:17,699 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:35:17,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:19,164 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:35:19,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:19,167 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 30 proven. 84 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:35:19,168 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:35:19,168 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [614610535] [2021-11-02 22:35:19,168 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [614610535] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:35:19,168 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1251069874] [2021-11-02 22:35:19,168 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-02 22:35:19,168 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:35:19,168 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:35:19,169 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:35:19,171 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-11-02 22:35:20,112 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 8 check-sat command(s) [2021-11-02 22:35:20,113 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:35:20,115 INFO L263 TraceCheckSpWp]: Trace formula consists of 251 conjuncts, 64 conjunts are in the unsatisfiable core [2021-11-02 22:35:20,116 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:35:20,734 INFO L388 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 21 treesize of output 17 [2021-11-02 22:35:33,617 INFO L354 Elim1Store]: treesize reduction 223, result has 9.7 percent of original size [2021-11-02 22:35:33,618 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 7 select indices, 7 select index equivalence classes, 0 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 21 case distinctions, treesize of input 74 treesize of output 56 [2021-11-02 22:35:33,636 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 29 proven. 71 refuted. 14 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:35:33,636 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1251069874] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:35:33,636 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:35:33,636 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27] total 50 [2021-11-02 22:35:33,637 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1910992964] [2021-11-02 22:35:33,637 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-11-02 22:35:33,637 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:35:33,638 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-11-02 22:35:33,638 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=219, Invalid=2212, Unknown=19, NotChecked=0, Total=2450 [2021-11-02 22:35:33,639 INFO L87 Difference]: Start difference. First operand 302 states and 337 transitions. Second operand has 50 states, 48 states have (on average 1.9791666666666667) internal successors, (95), 47 states have internal predecessors, (95), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:35:38,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:35:38,576 INFO L93 Difference]: Finished difference Result 415 states and 461 transitions. [2021-11-02 22:35:38,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-11-02 22:35:38,577 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 48 states have (on average 1.9791666666666667) internal successors, (95), 47 states have internal predecessors, (95), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 56 [2021-11-02 22:35:38,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:35:38,579 INFO L225 Difference]: With dead ends: 415 [2021-11-02 22:35:38,580 INFO L226 Difference]: Without dead ends: 399 [2021-11-02 22:35:38,581 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2222 ImplicationChecksByTransitivity, 17.1s TimeCoverageRelationStatistics Valid=912, Invalid=7625, Unknown=19, NotChecked=0, Total=8556 [2021-11-02 22:35:38,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 399 states. [2021-11-02 22:35:38,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 399 to 342. [2021-11-02 22:35:38,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 342 states, 327 states have (on average 1.1406727828746177) internal successors, (373), 329 states have internal predecessors, (373), 11 states have call successors, (11), 11 states have call predecessors, (11), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:35:38,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 342 states to 342 states and 385 transitions. [2021-11-02 22:35:38,590 INFO L78 Accepts]: Start accepts. Automaton has 342 states and 385 transitions. Word has length 56 [2021-11-02 22:35:38,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:35:38,591 INFO L470 AbstractCegarLoop]: Abstraction has 342 states and 385 transitions. [2021-11-02 22:35:38,591 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 48 states have (on average 1.9791666666666667) internal successors, (95), 47 states have internal predecessors, (95), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:35:38,591 INFO L276 IsEmpty]: Start isEmpty. Operand 342 states and 385 transitions. [2021-11-02 22:35:38,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-02 22:35:38,593 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:35:38,593 INFO L513 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:35:38,637 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2021-11-02 22:35:38,809 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:35:38,809 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting cstrcatErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:35:38,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:35:38,809 INFO L85 PathProgramCache]: Analyzing trace with hash 761298969, now seen corresponding path program 6 times [2021-11-02 22:35:38,809 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:35:38,810 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [76751268] [2021-11-02 22:35:38,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:38,810 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:35:38,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:39,542 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:35:39,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:39,547 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 6 proven. 45 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:35:39,547 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:35:39,547 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [76751268] [2021-11-02 22:35:39,547 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [76751268] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:35:39,548 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1123323586] [2021-11-02 22:35:39,548 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-02 22:35:39,548 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:35:39,548 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:35:39,549 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:35:39,569 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-02 22:35:40,692 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2021-11-02 22:35:40,692 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:35:40,695 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 86 conjunts are in the unsatisfiable core [2021-11-02 22:35:40,696 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:35:40,727 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-02 22:35:41,202 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-02 22:35:41,243 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:35:41,245 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 23 [2021-11-02 22:35:41,608 INFO L354 Elim1Store]: treesize reduction 23, result has 36.1 percent of original size [2021-11-02 22:35:41,608 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 36 [2021-11-02 22:35:41,764 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:35:41,765 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 24 [2021-11-02 22:35:41,870 INFO L388 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 [2021-11-02 22:35:41,887 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 6 proven. 18 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-02 22:35:41,887 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1123323586] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:35:41,887 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:35:41,887 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 17] total 31 [2021-11-02 22:35:41,887 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1292789388] [2021-11-02 22:35:41,888 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-02 22:35:41,888 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:35:41,888 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-02 22:35:41,889 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=848, Unknown=0, NotChecked=0, Total=930 [2021-11-02 22:35:41,889 INFO L87 Difference]: Start difference. First operand 342 states and 385 transitions. Second operand has 31 states, 30 states have (on average 2.433333333333333) internal successors, (73), 28 states have internal predecessors, (73), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:35:43,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:35:43,482 INFO L93 Difference]: Finished difference Result 526 states and 592 transitions. [2021-11-02 22:35:43,482 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-02 22:35:43,482 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 2.433333333333333) internal successors, (73), 28 states have internal predecessors, (73), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 57 [2021-11-02 22:35:43,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:35:43,484 INFO L225 Difference]: With dead ends: 526 [2021-11-02 22:35:43,484 INFO L226 Difference]: Without dead ends: 466 [2021-11-02 22:35:43,485 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 47 SyntacticMatches, 5 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 663 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=252, Invalid=2610, Unknown=0, NotChecked=0, Total=2862 [2021-11-02 22:35:43,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 466 states. [2021-11-02 22:35:43,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 466 to 450. [2021-11-02 22:35:43,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 450 states, 431 states have (on average 1.1392111368909512) internal successors, (491), 433 states have internal predecessors, (491), 15 states have call successors, (15), 15 states have call predecessors, (15), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:35:43,494 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 450 states to 450 states and 507 transitions. [2021-11-02 22:35:43,494 INFO L78 Accepts]: Start accepts. Automaton has 450 states and 507 transitions. Word has length 57 [2021-11-02 22:35:43,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:35:43,494 INFO L470 AbstractCegarLoop]: Abstraction has 450 states and 507 transitions. [2021-11-02 22:35:43,495 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 30 states have (on average 2.433333333333333) internal successors, (73), 28 states have internal predecessors, (73), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:35:43,495 INFO L276 IsEmpty]: Start isEmpty. Operand 450 states and 507 transitions. [2021-11-02 22:35:43,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-02 22:35:43,496 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:35:43,497 INFO L513 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:35:43,554 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2021-11-02 22:35:43,721 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2021-11-02 22:35:43,721 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting cstrcatErr5REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:35:43,721 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:35:43,721 INFO L85 PathProgramCache]: Analyzing trace with hash -917832412, now seen corresponding path program 4 times [2021-11-02 22:35:43,721 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:35:43,722 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1251253744] [2021-11-02 22:35:43,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:43,722 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:35:43,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:44,110 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:35:44,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:44,115 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 15 proven. 53 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:35:44,115 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:35:44,115 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1251253744] [2021-11-02 22:35:44,115 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1251253744] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:35:44,115 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [821448176] [2021-11-02 22:35:44,115 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-02 22:35:44,115 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:35:44,116 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:35:44,117 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:35:44,133 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2021-11-02 22:35:45,380 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-02 22:35:45,380 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:35:45,382 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 62 conjunts are in the unsatisfiable core [2021-11-02 22:35:45,384 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:35:45,459 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:35:45,459 INFO L388 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 1 case distinctions, treesize of input 18 treesize of output 23 [2021-11-02 22:35:45,761 INFO L388 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 25 treesize of output 21 [2021-11-02 22:35:46,637 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:35:46,638 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:35:46,639 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:35:46,639 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:35:46,640 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:35:46,641 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:35:46,664 INFO L354 Elim1Store]: treesize reduction 18, result has 64.7 percent of original size [2021-11-02 22:35:46,664 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 6 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 66 treesize of output 69 [2021-11-02 22:35:46,968 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 0 proven. 23 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-02 22:35:46,969 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [821448176] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:35:46,969 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:35:46,969 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 34 [2021-11-02 22:35:46,969 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [750483732] [2021-11-02 22:35:46,969 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-02 22:35:46,969 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:35:46,970 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-02 22:35:46,970 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=1103, Unknown=0, NotChecked=0, Total=1190 [2021-11-02 22:35:46,970 INFO L87 Difference]: Start difference. First operand 450 states and 507 transitions. Second operand has 35 states, 33 states have (on average 2.727272727272727) internal successors, (90), 32 states have internal predecessors, (90), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:35:51,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:35:51,964 INFO L93 Difference]: Finished difference Result 579 states and 636 transitions. [2021-11-02 22:35:51,964 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-11-02 22:35:51,964 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 33 states have (on average 2.727272727272727) internal successors, (90), 32 states have internal predecessors, (90), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 58 [2021-11-02 22:35:51,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:35:51,968 INFO L225 Difference]: With dead ends: 579 [2021-11-02 22:35:51,968 INFO L226 Difference]: Without dead ends: 554 [2021-11-02 22:35:51,969 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1413 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=423, Invalid=5127, Unknown=0, NotChecked=0, Total=5550 [2021-11-02 22:35:51,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 554 states. [2021-11-02 22:35:51,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 554 to 450. [2021-11-02 22:35:51,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 450 states, 431 states have (on average 1.122969837587007) internal successors, (484), 433 states have internal predecessors, (484), 15 states have call successors, (15), 15 states have call predecessors, (15), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:35:51,983 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 450 states to 450 states and 500 transitions. [2021-11-02 22:35:51,984 INFO L78 Accepts]: Start accepts. Automaton has 450 states and 500 transitions. Word has length 58 [2021-11-02 22:35:51,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:35:51,984 INFO L470 AbstractCegarLoop]: Abstraction has 450 states and 500 transitions. [2021-11-02 22:35:51,985 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 33 states have (on average 2.727272727272727) internal successors, (90), 32 states have internal predecessors, (90), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:35:51,985 INFO L276 IsEmpty]: Start isEmpty. Operand 450 states and 500 transitions. [2021-11-02 22:35:51,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-02 22:35:51,987 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:35:51,987 INFO L513 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:35:52,020 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2021-11-02 22:35:52,201 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2021-11-02 22:35:52,201 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting cstrcatErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:35:52,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:35:52,201 INFO L85 PathProgramCache]: Analyzing trace with hash -1187303152, now seen corresponding path program 12 times [2021-11-02 22:35:52,201 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:35:52,202 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [805219631] [2021-11-02 22:35:52,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:52,202 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:35:52,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:52,672 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:35:52,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:52,676 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 45 proven. 95 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:35:52,676 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:35:52,677 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [805219631] [2021-11-02 22:35:52,677 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [805219631] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:35:52,677 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1356269352] [2021-11-02 22:35:52,677 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-02 22:35:52,677 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:35:52,677 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:35:52,681 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:35:52,697 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-11-02 22:35:54,012 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 8 check-sat command(s) [2021-11-02 22:35:54,012 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:35:54,014 INFO L263 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 46 conjunts are in the unsatisfiable core [2021-11-02 22:35:54,016 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:35:54,049 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:35:54,050 INFO L388 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-02 22:35:54,865 INFO L134 CoverageAnalysis]: Checked inductivity of 140 backedges. 66 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:35:54,865 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1356269352] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:35:54,865 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:35:54,865 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 40 [2021-11-02 22:35:54,865 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1845508936] [2021-11-02 22:35:54,866 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2021-11-02 22:35:54,866 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:35:54,866 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-11-02 22:35:54,866 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=201, Invalid=1439, Unknown=0, NotChecked=0, Total=1640 [2021-11-02 22:35:54,867 INFO L87 Difference]: Start difference. First operand 450 states and 500 transitions. Second operand has 41 states, 40 states have (on average 2.675) internal successors, (107), 38 states have internal predecessors, (107), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:35:56,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:35:56,226 INFO L93 Difference]: Finished difference Result 628 states and 690 transitions. [2021-11-02 22:35:56,227 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-02 22:35:56,227 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 40 states have (on average 2.675) internal successors, (107), 38 states have internal predecessors, (107), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 60 [2021-11-02 22:35:56,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:35:56,230 INFO L225 Difference]: With dead ends: 628 [2021-11-02 22:35:56,230 INFO L226 Difference]: Without dead ends: 628 [2021-11-02 22:35:56,231 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 702 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=324, Invalid=2226, Unknown=0, NotChecked=0, Total=2550 [2021-11-02 22:35:56,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 628 states. [2021-11-02 22:35:56,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 628 to 458. [2021-11-02 22:35:56,242 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 458 states, 439 states have (on average 1.1275626423690206) internal successors, (495), 441 states have internal predecessors, (495), 15 states have call successors, (15), 15 states have call predecessors, (15), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:35:56,244 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 458 states to 458 states and 511 transitions. [2021-11-02 22:35:56,244 INFO L78 Accepts]: Start accepts. Automaton has 458 states and 511 transitions. Word has length 60 [2021-11-02 22:35:56,244 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:35:56,244 INFO L470 AbstractCegarLoop]: Abstraction has 458 states and 511 transitions. [2021-11-02 22:35:56,244 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 40 states have (on average 2.675) internal successors, (107), 38 states have internal predecessors, (107), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:35:56,245 INFO L276 IsEmpty]: Start isEmpty. Operand 458 states and 511 transitions. [2021-11-02 22:35:56,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-02 22:35:56,246 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:35:56,247 INFO L513 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:35:56,293 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2021-11-02 22:35:56,465 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:35:56,465 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting cstrcatErr5REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:35:56,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:35:56,465 INFO L85 PathProgramCache]: Analyzing trace with hash 297185571, now seen corresponding path program 5 times [2021-11-02 22:35:56,465 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:35:56,466 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1947892203] [2021-11-02 22:35:56,466 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:35:56,466 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:35:56,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:57,145 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:35:57,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:35:57,149 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 8 proven. 36 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-02 22:35:57,149 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:35:57,150 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1947892203] [2021-11-02 22:35:57,150 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1947892203] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:35:57,150 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [708305619] [2021-11-02 22:35:57,150 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-02 22:35:57,150 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:35:57,150 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:35:57,151 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:35:57,173 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-11-02 22:35:58,397 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-11-02 22:35:58,397 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:35:58,400 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 46 conjunts are in the unsatisfiable core [2021-11-02 22:35:58,401 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:35:58,858 INFO L388 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 21 treesize of output 17 [2021-11-02 22:35:59,064 INFO L354 Elim1Store]: treesize reduction 27, result has 22.9 percent of original size [2021-11-02 22:35:59,064 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 34 treesize of output 24 [2021-11-02 22:35:59,121 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 10 proven. 34 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-02 22:35:59,121 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [708305619] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:35:59,121 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:35:59,121 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 34 [2021-11-02 22:35:59,121 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [885941031] [2021-11-02 22:35:59,122 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-02 22:35:59,122 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:35:59,122 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-02 22:35:59,122 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=997, Unknown=0, NotChecked=0, Total=1122 [2021-11-02 22:35:59,123 INFO L87 Difference]: Start difference. First operand 458 states and 511 transitions. Second operand has 34 states, 32 states have (on average 2.65625) internal successors, (85), 31 states have internal predecessors, (85), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:36:00,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:36:00,444 INFO L93 Difference]: Finished difference Result 478 states and 531 transitions. [2021-11-02 22:36:00,445 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-02 22:36:00,445 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 32 states have (on average 2.65625) internal successors, (85), 31 states have internal predecessors, (85), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 60 [2021-11-02 22:36:00,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:36:00,447 INFO L225 Difference]: With dead ends: 478 [2021-11-02 22:36:00,447 INFO L226 Difference]: Without dead ends: 470 [2021-11-02 22:36:00,447 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 777 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=538, Invalid=2884, Unknown=0, NotChecked=0, Total=3422 [2021-11-02 22:36:00,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 470 states. [2021-11-02 22:36:00,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 470 to 458. [2021-11-02 22:36:00,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 458 states, 440 states have (on average 1.1272727272727272) internal successors, (496), 442 states have internal predecessors, (496), 14 states have call successors, (14), 14 states have call predecessors, (14), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:36:00,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 458 states to 458 states and 511 transitions. [2021-11-02 22:36:00,457 INFO L78 Accepts]: Start accepts. Automaton has 458 states and 511 transitions. Word has length 60 [2021-11-02 22:36:00,457 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:36:00,457 INFO L470 AbstractCegarLoop]: Abstraction has 458 states and 511 transitions. [2021-11-02 22:36:00,458 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 32 states have (on average 2.65625) internal successors, (85), 31 states have internal predecessors, (85), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:36:00,458 INFO L276 IsEmpty]: Start isEmpty. Operand 458 states and 511 transitions. [2021-11-02 22:36:00,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-02 22:36:00,459 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:36:00,460 INFO L513 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:36:00,517 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2021-11-02 22:36:00,673 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable51 [2021-11-02 22:36:00,673 INFO L402 AbstractCegarLoop]: === Iteration 53 === Targeting cstrcatErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:36:00,673 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:36:00,673 INFO L85 PathProgramCache]: Analyzing trace with hash 1017640310, now seen corresponding path program 7 times [2021-11-02 22:36:00,674 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:36:00,674 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [612419965] [2021-11-02 22:36:00,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:36:00,674 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:36:00,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:00,936 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:36:00,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:00,947 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 1 proven. 32 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-02 22:36:00,947 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:36:00,947 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [612419965] [2021-11-02 22:36:00,947 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [612419965] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:36:00,947 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1999552775] [2021-11-02 22:36:00,948 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-02 22:36:00,948 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:36:00,948 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:36:00,949 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:36:00,954 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-11-02 22:36:02,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:02,247 INFO L263 TraceCheckSpWp]: Trace formula consists of 293 conjuncts, 46 conjunts are in the unsatisfiable core [2021-11-02 22:36:02,249 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:36:02,303 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:36:02,303 INFO L388 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 1 case distinctions, treesize of input 15 treesize of output 20 [2021-11-02 22:36:03,670 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 6 proven. 27 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-02 22:36:03,670 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1999552775] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:36:03,670 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:36:03,670 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 26 [2021-11-02 22:36:03,671 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1886056172] [2021-11-02 22:36:03,671 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-02 22:36:03,671 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:36:03,672 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-02 22:36:03,672 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=642, Unknown=0, NotChecked=0, Total=702 [2021-11-02 22:36:03,672 INFO L87 Difference]: Start difference. First operand 458 states and 511 transitions. Second operand has 27 states, 26 states have (on average 3.3076923076923075) internal successors, (86), 24 states have internal predecessors, (86), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:36:04,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:36:04,988 INFO L93 Difference]: Finished difference Result 481 states and 530 transitions. [2021-11-02 22:36:04,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-02 22:36:04,989 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 3.3076923076923075) internal successors, (86), 24 states have internal predecessors, (86), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 61 [2021-11-02 22:36:04,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:36:04,991 INFO L225 Difference]: With dead ends: 481 [2021-11-02 22:36:04,991 INFO L226 Difference]: Without dead ends: 481 [2021-11-02 22:36:04,991 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 186 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=153, Invalid=1329, Unknown=0, NotChecked=0, Total=1482 [2021-11-02 22:36:04,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 481 states. [2021-11-02 22:36:04,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 481 to 471. [2021-11-02 22:36:04,999 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 471 states, 453 states have (on average 1.1236203090507726) internal successors, (509), 455 states have internal predecessors, (509), 14 states have call successors, (14), 14 states have call predecessors, (14), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:36:05,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 471 states to 471 states and 524 transitions. [2021-11-02 22:36:05,000 INFO L78 Accepts]: Start accepts. Automaton has 471 states and 524 transitions. Word has length 61 [2021-11-02 22:36:05,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:36:05,001 INFO L470 AbstractCegarLoop]: Abstraction has 471 states and 524 transitions. [2021-11-02 22:36:05,001 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 26 states have (on average 3.3076923076923075) internal successors, (86), 24 states have internal predecessors, (86), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:36:05,001 INFO L276 IsEmpty]: Start isEmpty. Operand 471 states and 524 transitions. [2021-11-02 22:36:05,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-02 22:36:05,003 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:36:05,003 INFO L513 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:36:05,044 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Ended with exit code 0 [2021-11-02 22:36:05,227 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable52 [2021-11-02 22:36:05,227 INFO L402 AbstractCegarLoop]: === Iteration 54 === Targeting cstrcatErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:36:05,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:36:05,228 INFO L85 PathProgramCache]: Analyzing trace with hash 1462972681, now seen corresponding path program 13 times [2021-11-02 22:36:05,228 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:36:05,228 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1586235916] [2021-11-02 22:36:05,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:36:05,228 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:36:05,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:06,690 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:36:06,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:06,707 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 41 proven. 113 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:36:06,707 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:36:06,707 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1586235916] [2021-11-02 22:36:06,708 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1586235916] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:36:06,708 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [948014523] [2021-11-02 22:36:06,708 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-02 22:36:06,708 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:36:06,709 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:36:06,724 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:36:06,725 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2021-11-02 22:36:08,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:08,131 INFO L263 TraceCheckSpWp]: Trace formula consists of 273 conjuncts, 74 conjunts are in the unsatisfiable core [2021-11-02 22:36:08,133 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:36:08,864 INFO L388 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 21 treesize of output 17 [2021-11-02 22:36:35,644 INFO L354 Elim1Store]: treesize reduction 302, result has 8.5 percent of original size [2021-11-02 22:36:35,645 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 84 treesize of output 64 [2021-11-02 22:36:35,661 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 30 proven. 97 refuted. 27 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:36:35,662 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [948014523] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:36:35,662 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:36:35,662 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30] total 56 [2021-11-02 22:36:35,662 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [307894506] [2021-11-02 22:36:35,662 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2021-11-02 22:36:35,663 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:36:35,663 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-11-02 22:36:35,663 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=263, Invalid=2779, Unknown=38, NotChecked=0, Total=3080 [2021-11-02 22:36:35,664 INFO L87 Difference]: Start difference. First operand 471 states and 524 transitions. Second operand has 56 states, 54 states have (on average 1.9814814814814814) internal successors, (107), 53 states have internal predecessors, (107), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:36:42,954 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:36:42,954 INFO L93 Difference]: Finished difference Result 627 states and 695 transitions. [2021-11-02 22:36:42,954 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-11-02 22:36:42,955 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 54 states have (on average 1.9814814814814814) internal successors, (107), 53 states have internal predecessors, (107), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 62 [2021-11-02 22:36:42,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:36:42,957 INFO L225 Difference]: With dead ends: 627 [2021-11-02 22:36:42,957 INFO L226 Difference]: Without dead ends: 609 [2021-11-02 22:36:42,961 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2993 ImplicationChecksByTransitivity, 32.6s TimeCoverageRelationStatistics Valid=1159, Invalid=9933, Unknown=38, NotChecked=0, Total=11130 [2021-11-02 22:36:42,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 609 states. [2021-11-02 22:36:42,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 609 to 535. [2021-11-02 22:36:42,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 535 states, 514 states have (on average 1.132295719844358) internal successors, (582), 516 states have internal predecessors, (582), 17 states have call successors, (17), 17 states have call predecessors, (17), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:36:42,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 535 states to 535 states and 600 transitions. [2021-11-02 22:36:42,972 INFO L78 Accepts]: Start accepts. Automaton has 535 states and 600 transitions. Word has length 62 [2021-11-02 22:36:42,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:36:42,973 INFO L470 AbstractCegarLoop]: Abstraction has 535 states and 600 transitions. [2021-11-02 22:36:42,973 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 54 states have (on average 1.9814814814814814) internal successors, (107), 53 states have internal predecessors, (107), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:36:42,973 INFO L276 IsEmpty]: Start isEmpty. Operand 535 states and 600 transitions. [2021-11-02 22:36:42,975 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-02 22:36:42,975 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:36:42,975 INFO L513 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 5, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:36:43,020 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2021-11-02 22:36:43,199 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:36:43,199 INFO L402 AbstractCegarLoop]: === Iteration 55 === Targeting cstrcatErr5REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:36:43,199 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:36:43,200 INFO L85 PathProgramCache]: Analyzing trace with hash 1079428576, now seen corresponding path program 6 times [2021-11-02 22:36:43,200 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:36:43,200 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1386426438] [2021-11-02 22:36:43,200 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:36:43,200 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:36:43,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:43,598 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:36:43,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:43,602 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 28 proven. 71 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:36:43,602 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:36:43,602 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1386426438] [2021-11-02 22:36:43,602 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1386426438] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:36:43,602 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1985695519] [2021-11-02 22:36:43,602 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-02 22:36:43,602 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:36:43,603 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:36:43,605 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:36:43,629 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2021-11-02 22:36:45,101 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-11-02 22:36:45,102 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:36:45,104 INFO L263 TraceCheckSpWp]: Trace formula consists of 296 conjuncts, 50 conjunts are in the unsatisfiable core [2021-11-02 22:36:45,106 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:36:45,146 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:36:45,146 INFO L388 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-02 22:36:46,053 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 45 proven. 54 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:36:46,053 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1985695519] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:36:46,053 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:36:46,053 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 38 [2021-11-02 22:36:46,054 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [975192101] [2021-11-02 22:36:46,054 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-02 22:36:46,054 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:36:46,055 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-02 22:36:46,055 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=1313, Unknown=0, NotChecked=0, Total=1482 [2021-11-02 22:36:46,056 INFO L87 Difference]: Start difference. First operand 535 states and 600 transitions. Second operand has 39 states, 38 states have (on average 3.026315789473684) internal successors, (115), 36 states have internal predecessors, (115), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:36:47,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:36:47,766 INFO L93 Difference]: Finished difference Result 694 states and 760 transitions. [2021-11-02 22:36:47,767 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-02 22:36:47,767 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 38 states have (on average 3.026315789473684) internal successors, (115), 36 states have internal predecessors, (115), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 64 [2021-11-02 22:36:47,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:36:47,769 INFO L225 Difference]: With dead ends: 694 [2021-11-02 22:36:47,770 INFO L226 Difference]: Without dead ends: 667 [2021-11-02 22:36:47,770 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 733 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=346, Invalid=2516, Unknown=0, NotChecked=0, Total=2862 [2021-11-02 22:36:47,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 667 states. [2021-11-02 22:36:47,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 667 to 533. [2021-11-02 22:36:47,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 533 states, 512 states have (on average 1.1171875) internal successors, (572), 514 states have internal predecessors, (572), 17 states have call successors, (17), 17 states have call predecessors, (17), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:36:47,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 533 states to 533 states and 590 transitions. [2021-11-02 22:36:47,782 INFO L78 Accepts]: Start accepts. Automaton has 533 states and 590 transitions. Word has length 64 [2021-11-02 22:36:47,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:36:47,782 INFO L470 AbstractCegarLoop]: Abstraction has 533 states and 590 transitions. [2021-11-02 22:36:47,783 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 38 states have (on average 3.026315789473684) internal successors, (115), 36 states have internal predecessors, (115), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:36:47,783 INFO L276 IsEmpty]: Start isEmpty. Operand 533 states and 590 transitions. [2021-11-02 22:36:47,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-02 22:36:47,785 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:36:47,785 INFO L513 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:36:47,833 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2021-11-02 22:36:47,999 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:36:47,999 INFO L402 AbstractCegarLoop]: === Iteration 56 === Targeting cstrcatErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:36:47,999 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:36:47,999 INFO L85 PathProgramCache]: Analyzing trace with hash 339252990, now seen corresponding path program 8 times [2021-11-02 22:36:47,999 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:36:48,000 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1413823635] [2021-11-02 22:36:48,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:36:48,000 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:36:48,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:48,849 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:36:48,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:48,852 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 9 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:36:48,852 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:36:48,853 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1413823635] [2021-11-02 22:36:48,853 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1413823635] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:36:48,853 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [895711752] [2021-11-02 22:36:48,853 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:36:48,853 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:36:48,853 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:36:48,854 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:36:48,855 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2021-11-02 22:36:50,374 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-02 22:36:50,374 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:36:50,377 INFO L263 TraceCheckSpWp]: Trace formula consists of 321 conjuncts, 100 conjunts are in the unsatisfiable core [2021-11-02 22:36:50,379 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:36:50,977 INFO L388 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 21 treesize of output 17 [2021-11-02 22:36:51,051 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-02 22:36:51,051 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 31 treesize of output 30 [2021-11-02 22:36:51,614 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-02 22:36:51,648 INFO L354 Elim1Store]: treesize reduction 98, result has 27.9 percent of original size [2021-11-02 22:36:51,648 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 43 treesize of output 60 [2021-11-02 22:36:52,085 INFO L354 Elim1Store]: treesize reduction 34, result has 47.7 percent of original size [2021-11-02 22:36:52,085 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 4 case distinctions, treesize of input 57 treesize of output 77 [2021-11-02 22:36:52,328 INFO L354 Elim1Store]: treesize reduction 64, result has 21.0 percent of original size [2021-11-02 22:36:52,328 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 39 treesize of output 41 [2021-11-02 22:36:52,517 INFO L354 Elim1Store]: treesize reduction 18, result has 14.3 percent of original size [2021-11-02 22:36:52,518 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 31 treesize of output 20 [2021-11-02 22:36:52,528 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 8 proven. 39 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-02 22:36:52,528 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [895711752] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:36:52,528 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:36:52,528 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 24] total 49 [2021-11-02 22:36:52,529 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1148975992] [2021-11-02 22:36:52,529 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-02 22:36:52,529 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:36:52,529 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-02 22:36:52,530 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=2223, Unknown=0, NotChecked=0, Total=2352 [2021-11-02 22:36:52,530 INFO L87 Difference]: Start difference. First operand 533 states and 590 transitions. Second operand has 49 states, 48 states have (on average 2.125) internal successors, (102), 46 states have internal predecessors, (102), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:36:57,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:36:57,193 INFO L93 Difference]: Finished difference Result 817 states and 900 transitions. [2021-11-02 22:36:57,194 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-11-02 22:36:57,194 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 48 states have (on average 2.125) internal successors, (102), 46 states have internal predecessors, (102), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 65 [2021-11-02 22:36:57,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:36:57,197 INFO L225 Difference]: With dead ends: 817 [2021-11-02 22:36:57,197 INFO L226 Difference]: Without dead ends: 665 [2021-11-02 22:36:57,197 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 47 SyntacticMatches, 1 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2280 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=622, Invalid=9080, Unknown=0, NotChecked=0, Total=9702 [2021-11-02 22:36:57,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 665 states. [2021-11-02 22:36:57,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 665 to 635. [2021-11-02 22:36:57,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 635 states, 612 states have (on average 1.1160130718954249) internal successors, (683), 614 states have internal predecessors, (683), 19 states have call successors, (19), 19 states have call predecessors, (19), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:36:57,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 635 states to 635 states and 703 transitions. [2021-11-02 22:36:57,211 INFO L78 Accepts]: Start accepts. Automaton has 635 states and 703 transitions. Word has length 65 [2021-11-02 22:36:57,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:36:57,211 INFO L470 AbstractCegarLoop]: Abstraction has 635 states and 703 transitions. [2021-11-02 22:36:57,211 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 48 states have (on average 2.125) internal successors, (102), 46 states have internal predecessors, (102), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:36:57,212 INFO L276 IsEmpty]: Start isEmpty. Operand 635 states and 703 transitions. [2021-11-02 22:36:57,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-02 22:36:57,213 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:36:57,214 INFO L513 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:36:57,259 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2021-11-02 22:36:57,441 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable55 [2021-11-02 22:36:57,441 INFO L402 AbstractCegarLoop]: === Iteration 57 === Targeting cstrcatErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:36:57,441 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:36:57,441 INFO L85 PathProgramCache]: Analyzing trace with hash -419942132, now seen corresponding path program 14 times [2021-11-02 22:36:57,441 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:36:57,442 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2002590018] [2021-11-02 22:36:57,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:36:57,442 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:36:57,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:57,927 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:36:57,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:36:57,931 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 66 proven. 118 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:36:57,931 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:36:57,931 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2002590018] [2021-11-02 22:36:57,931 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2002590018] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:36:57,931 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [191004563] [2021-11-02 22:36:57,931 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:36:57,932 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:36:57,932 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:36:57,933 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:36:57,953 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2021-11-02 22:36:59,519 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-02 22:36:59,519 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:36:59,521 INFO L263 TraceCheckSpWp]: Trace formula consists of 284 conjuncts, 57 conjunts are in the unsatisfiable core [2021-11-02 22:36:59,523 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:36:59,558 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:36:59,558 INFO L388 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-02 22:37:00,557 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 91 proven. 93 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:37:00,558 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [191004563] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:37:00,558 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:37:00,558 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 43 [2021-11-02 22:37:00,558 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [336264583] [2021-11-02 22:37:00,558 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-11-02 22:37:00,559 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:37:00,559 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-11-02 22:37:00,559 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=1682, Unknown=0, NotChecked=0, Total=1892 [2021-11-02 22:37:00,559 INFO L87 Difference]: Start difference. First operand 635 states and 703 transitions. Second operand has 44 states, 43 states have (on average 2.7674418604651163) internal successors, (119), 41 states have internal predecessors, (119), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:37:01,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:37:01,978 INFO L93 Difference]: Finished difference Result 881 states and 967 transitions. [2021-11-02 22:37:01,978 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-02 22:37:01,979 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 43 states have (on average 2.7674418604651163) internal successors, (119), 41 states have internal predecessors, (119), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 66 [2021-11-02 22:37:01,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:37:01,982 INFO L225 Difference]: With dead ends: 881 [2021-11-02 22:37:01,982 INFO L226 Difference]: Without dead ends: 881 [2021-11-02 22:37:01,983 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 955 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=309, Invalid=2661, Unknown=0, NotChecked=0, Total=2970 [2021-11-02 22:37:01,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 881 states. [2021-11-02 22:37:01,994 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 881 to 645. [2021-11-02 22:37:01,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 645 states, 622 states have (on average 1.1205787781350482) internal successors, (697), 624 states have internal predecessors, (697), 19 states have call successors, (19), 19 states have call predecessors, (19), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:37:01,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 645 states to 645 states and 717 transitions. [2021-11-02 22:37:01,997 INFO L78 Accepts]: Start accepts. Automaton has 645 states and 717 transitions. Word has length 66 [2021-11-02 22:37:01,997 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:37:01,997 INFO L470 AbstractCegarLoop]: Abstraction has 645 states and 717 transitions. [2021-11-02 22:37:01,997 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 43 states have (on average 2.7674418604651163) internal successors, (119), 41 states have internal predecessors, (119), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:37:01,998 INFO L276 IsEmpty]: Start isEmpty. Operand 645 states and 717 transitions. [2021-11-02 22:37:01,999 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-02 22:37:02,000 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:37:02,000 INFO L513 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:37:02,043 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2021-11-02 22:37:02,224 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable56 [2021-11-02 22:37:02,224 INFO L402 AbstractCegarLoop]: === Iteration 58 === Targeting cstrcatErr5REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:37:02,224 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:37:02,224 INFO L85 PathProgramCache]: Analyzing trace with hash -1811502369, now seen corresponding path program 7 times [2021-11-02 22:37:02,224 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:37:02,225 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [249322381] [2021-11-02 22:37:02,225 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:37:02,225 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:37:02,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:03,177 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:37:03,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:03,182 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 12 proven. 57 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-02 22:37:03,183 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:37:03,183 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [249322381] [2021-11-02 22:37:03,183 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [249322381] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:37:03,183 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [524576180] [2021-11-02 22:37:03,183 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-02 22:37:03,183 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:37:03,184 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:37:03,189 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:37:03,210 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2021-11-02 22:37:05,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:05,015 INFO L263 TraceCheckSpWp]: Trace formula consists of 313 conjuncts, 46 conjunts are in the unsatisfiable core [2021-11-02 22:37:05,017 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:37:05,671 INFO L388 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 21 treesize of output 17 [2021-11-02 22:37:06,069 INFO L354 Elim1Store]: treesize reduction 58, result has 17.1 percent of original size [2021-11-02 22:37:06,070 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 44 treesize of output 32 [2021-11-02 22:37:06,101 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 17 proven. 52 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-02 22:37:06,102 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [524576180] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:37:06,102 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:37:06,102 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 39 [2021-11-02 22:37:06,102 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1525650115] [2021-11-02 22:37:06,102 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-02 22:37:06,102 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:37:06,102 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-02 22:37:06,103 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=150, Invalid=1332, Unknown=0, NotChecked=0, Total=1482 [2021-11-02 22:37:06,103 INFO L87 Difference]: Start difference. First operand 645 states and 717 transitions. Second operand has 39 states, 37 states have (on average 2.5945945945945947) internal successors, (96), 36 states have internal predecessors, (96), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:37:08,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:37:08,749 INFO L93 Difference]: Finished difference Result 678 states and 750 transitions. [2021-11-02 22:37:08,761 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-11-02 22:37:08,761 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 37 states have (on average 2.5945945945945947) internal successors, (96), 36 states have internal predecessors, (96), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 66 [2021-11-02 22:37:08,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:37:08,765 INFO L225 Difference]: With dead ends: 678 [2021-11-02 22:37:08,766 INFO L226 Difference]: Without dead ends: 658 [2021-11-02 22:37:08,767 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1343 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=688, Invalid=4568, Unknown=0, NotChecked=0, Total=5256 [2021-11-02 22:37:08,767 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 658 states. [2021-11-02 22:37:08,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 658 to 643. [2021-11-02 22:37:08,778 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 643 states, 622 states have (on average 1.1205787781350482) internal successors, (697), 624 states have internal predecessors, (697), 17 states have call successors, (17), 17 states have call predecessors, (17), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:37:08,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 643 states to 643 states and 715 transitions. [2021-11-02 22:37:08,780 INFO L78 Accepts]: Start accepts. Automaton has 643 states and 715 transitions. Word has length 66 [2021-11-02 22:37:08,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:37:08,781 INFO L470 AbstractCegarLoop]: Abstraction has 643 states and 715 transitions. [2021-11-02 22:37:08,781 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 37 states have (on average 2.5945945945945947) internal successors, (96), 36 states have internal predecessors, (96), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:37:08,781 INFO L276 IsEmpty]: Start isEmpty. Operand 643 states and 715 transitions. [2021-11-02 22:37:08,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-02 22:37:08,783 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:37:08,783 INFO L513 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:37:08,831 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2021-11-02 22:37:08,997 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable57 [2021-11-02 22:37:08,997 INFO L402 AbstractCegarLoop]: === Iteration 59 === Targeting cstrcatErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:37:08,997 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:37:08,997 INFO L85 PathProgramCache]: Analyzing trace with hash 162537989, now seen corresponding path program 15 times [2021-11-02 22:37:08,998 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:37:08,998 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [588489841] [2021-11-02 22:37:08,998 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:37:08,998 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:37:09,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:11,016 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:37:11,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:11,020 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 54 proven. 146 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:37:11,020 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:37:11,020 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [588489841] [2021-11-02 22:37:11,020 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [588489841] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:37:11,020 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1887308992] [2021-11-02 22:37:11,021 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-02 22:37:11,021 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:37:11,021 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:37:11,022 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:37:11,023 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2021-11-02 22:37:12,792 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-11-02 22:37:12,792 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:37:12,796 INFO L263 TraceCheckSpWp]: Trace formula consists of 295 conjuncts, 97 conjunts are in the unsatisfiable core [2021-11-02 22:37:12,798 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:37:13,696 INFO L388 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 44 treesize of output 40 [2021-11-02 22:37:15,394 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-02 22:37:15,394 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 28 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 71 treesize of output 35 [2021-11-02 22:37:15,405 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 24 proven. 176 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:37:15,406 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1887308992] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:37:15,406 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:37:15,406 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33] total 56 [2021-11-02 22:37:15,406 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1471927706] [2021-11-02 22:37:15,406 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2021-11-02 22:37:15,406 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:37:15,407 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-11-02 22:37:15,407 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=263, Invalid=2817, Unknown=0, NotChecked=0, Total=3080 [2021-11-02 22:37:15,407 INFO L87 Difference]: Start difference. First operand 643 states and 715 transitions. Second operand has 56 states, 55 states have (on average 2.0) internal successors, (110), 54 states have internal predecessors, (110), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:37:19,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:37:19,759 INFO L93 Difference]: Finished difference Result 851 states and 943 transitions. [2021-11-02 22:37:19,759 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-11-02 22:37:19,759 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 55 states have (on average 2.0) internal successors, (110), 54 states have internal predecessors, (110), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 68 [2021-11-02 22:37:19,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:37:19,763 INFO L225 Difference]: With dead ends: 851 [2021-11-02 22:37:19,763 INFO L226 Difference]: Without dead ends: 831 [2021-11-02 22:37:19,764 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2912 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=827, Invalid=9273, Unknown=0, NotChecked=0, Total=10100 [2021-11-02 22:37:19,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 831 states. [2021-11-02 22:37:19,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 831 to 735. [2021-11-02 22:37:19,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 735 states, 710 states have (on average 1.1295774647887324) internal successors, (802), 712 states have internal predecessors, (802), 21 states have call successors, (21), 21 states have call predecessors, (21), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:37:19,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 735 states to 735 states and 824 transitions. [2021-11-02 22:37:19,774 INFO L78 Accepts]: Start accepts. Automaton has 735 states and 824 transitions. Word has length 68 [2021-11-02 22:37:19,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:37:19,774 INFO L470 AbstractCegarLoop]: Abstraction has 735 states and 824 transitions. [2021-11-02 22:37:19,774 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 55 states have (on average 2.0) internal successors, (110), 54 states have internal predecessors, (110), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:37:19,775 INFO L276 IsEmpty]: Start isEmpty. Operand 735 states and 824 transitions. [2021-11-02 22:37:19,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-02 22:37:19,777 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:37:19,777 INFO L513 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 6, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:37:19,823 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2021-11-02 22:37:19,991 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable58 [2021-11-02 22:37:19,992 INFO L402 AbstractCegarLoop]: === Iteration 60 === Targeting cstrcatErr5REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:37:19,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:37:19,992 INFO L85 PathProgramCache]: Analyzing trace with hash -152653476, now seen corresponding path program 8 times [2021-11-02 22:37:19,992 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:37:19,992 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1119888431] [2021-11-02 22:37:19,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:37:19,992 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:37:20,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:20,551 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:37:20,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:20,556 INFO L134 CoverageAnalysis]: Checked inductivity of 137 backedges. 45 proven. 91 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:37:20,556 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:37:20,556 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1119888431] [2021-11-02 22:37:20,556 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1119888431] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:37:20,556 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [738089480] [2021-11-02 22:37:20,556 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:37:20,556 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:37:20,557 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:37:20,558 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:37:20,577 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2021-11-02 22:37:22,668 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-02 22:37:22,669 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:37:22,671 INFO L263 TraceCheckSpWp]: Trace formula consists of 318 conjuncts, 60 conjunts are in the unsatisfiable core [2021-11-02 22:37:22,673 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:37:22,707 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:37:22,707 INFO L388 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-02 22:37:23,633 INFO L134 CoverageAnalysis]: Checked inductivity of 137 backedges. 66 proven. 70 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:37:23,634 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [738089480] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:37:23,634 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:37:23,634 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 41 [2021-11-02 22:37:23,634 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1843687123] [2021-11-02 22:37:23,634 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2021-11-02 22:37:23,634 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:37:23,635 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-11-02 22:37:23,635 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=182, Invalid=1540, Unknown=0, NotChecked=0, Total=1722 [2021-11-02 22:37:23,635 INFO L87 Difference]: Start difference. First operand 735 states and 824 transitions. Second operand has 42 states, 41 states have (on average 3.097560975609756) internal successors, (127), 39 states have internal predecessors, (127), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:37:24,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:37:24,809 INFO L93 Difference]: Finished difference Result 941 states and 1032 transitions. [2021-11-02 22:37:24,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-02 22:37:24,810 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 41 states have (on average 3.097560975609756) internal successors, (127), 39 states have internal predecessors, (127), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 70 [2021-11-02 22:37:24,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:37:24,813 INFO L225 Difference]: With dead ends: 941 [2021-11-02 22:37:24,814 INFO L226 Difference]: Without dead ends: 908 [2021-11-02 22:37:24,814 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 51 SyntacticMatches, 1 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 853 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=279, Invalid=2477, Unknown=0, NotChecked=0, Total=2756 [2021-11-02 22:37:24,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 908 states. [2021-11-02 22:37:24,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 908 to 717. [2021-11-02 22:37:24,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 717 states, 692 states have (on average 1.1141618497109826) internal successors, (771), 694 states have internal predecessors, (771), 21 states have call successors, (21), 21 states have call predecessors, (21), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:37:24,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 717 states to 717 states and 793 transitions. [2021-11-02 22:37:24,829 INFO L78 Accepts]: Start accepts. Automaton has 717 states and 793 transitions. Word has length 70 [2021-11-02 22:37:24,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:37:24,830 INFO L470 AbstractCegarLoop]: Abstraction has 717 states and 793 transitions. [2021-11-02 22:37:24,830 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 41 states have (on average 3.097560975609756) internal successors, (127), 39 states have internal predecessors, (127), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:37:24,830 INFO L276 IsEmpty]: Start isEmpty. Operand 717 states and 793 transitions. [2021-11-02 22:37:24,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-11-02 22:37:24,832 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:37:24,833 INFO L513 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:37:24,864 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Ended with exit code 0 [2021-11-02 22:37:25,041 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable59 [2021-11-02 22:37:25,041 INFO L402 AbstractCegarLoop]: === Iteration 61 === Targeting cstrcatErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:37:25,041 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:37:25,041 INFO L85 PathProgramCache]: Analyzing trace with hash -1872243768, now seen corresponding path program 16 times [2021-11-02 22:37:25,041 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:37:25,041 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [886150957] [2021-11-02 22:37:25,042 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:37:25,042 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:37:25,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:25,671 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:37:25,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:25,674 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 91 proven. 143 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:37:25,674 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:37:25,675 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [886150957] [2021-11-02 22:37:25,675 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [886150957] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:37:25,675 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [799148948] [2021-11-02 22:37:25,675 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-02 22:37:25,675 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:37:25,676 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:37:25,677 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:37:25,678 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2021-11-02 22:37:27,388 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-02 22:37:27,388 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:37:27,391 INFO L263 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 82 conjunts are in the unsatisfiable core [2021-11-02 22:37:27,392 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:37:27,481 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:37:27,481 INFO L388 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 1 case distinctions, treesize of input 18 treesize of output 23 [2021-11-02 22:37:27,912 INFO L388 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 25 treesize of output 21 [2021-11-02 22:37:30,190 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:37:30,191 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:37:30,192 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:37:30,193 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:37:30,194 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:37:30,195 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:37:30,195 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:37:30,196 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:37:30,197 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:37:30,198 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:37:30,199 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:37:30,200 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:37:30,201 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:37:30,202 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:37:30,202 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:37:30,203 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:37:30,204 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:37:30,205 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:37:30,206 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:37:30,207 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:37:30,208 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:37:30,208 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:37:30,209 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:37:30,210 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:37:30,211 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:37:30,213 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:37:30,214 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:37:30,216 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:37:30,268 INFO L354 Elim1Store]: treesize reduction 42, result has 59.2 percent of original size [2021-11-02 22:37:30,268 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 9 select indices, 9 select index equivalence classes, 28 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 36 case distinctions, treesize of input 106 treesize of output 113 [2021-11-02 22:37:30,741 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2021-11-02 22:37:30,741 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [799148948] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:37:30,741 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:37:30,741 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24] total 48 [2021-11-02 22:37:30,742 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [565053077] [2021-11-02 22:37:30,742 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-02 22:37:30,742 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:37:30,743 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-02 22:37:30,743 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=2208, Unknown=0, NotChecked=0, Total=2352 [2021-11-02 22:37:30,743 INFO L87 Difference]: Start difference. First operand 717 states and 793 transitions. Second operand has 49 states, 47 states have (on average 2.1702127659574466) internal successors, (102), 46 states have internal predecessors, (102), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:37:43,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:37:43,525 INFO L93 Difference]: Finished difference Result 1065 states and 1164 transitions. [2021-11-02 22:37:43,526 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2021-11-02 22:37:43,526 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 47 states have (on average 2.1702127659574466) internal successors, (102), 46 states have internal predecessors, (102), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 72 [2021-11-02 22:37:43,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:37:43,531 INFO L225 Difference]: With dead ends: 1065 [2021-11-02 22:37:43,531 INFO L226 Difference]: Without dead ends: 1065 [2021-11-02 22:37:43,532 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4258 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=926, Invalid=13836, Unknown=0, NotChecked=0, Total=14762 [2021-11-02 22:37:43,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1065 states. [2021-11-02 22:37:43,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1065 to 727. [2021-11-02 22:37:43,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 727 states, 702 states have (on average 1.1182336182336183) internal successors, (785), 704 states have internal predecessors, (785), 21 states have call successors, (21), 21 states have call predecessors, (21), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:37:43,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 727 states to 727 states and 807 transitions. [2021-11-02 22:37:43,551 INFO L78 Accepts]: Start accepts. Automaton has 727 states and 807 transitions. Word has length 72 [2021-11-02 22:37:43,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:37:43,551 INFO L470 AbstractCegarLoop]: Abstraction has 727 states and 807 transitions. [2021-11-02 22:37:43,551 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 47 states have (on average 2.1702127659574466) internal successors, (102), 46 states have internal predecessors, (102), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:37:43,552 INFO L276 IsEmpty]: Start isEmpty. Operand 727 states and 807 transitions. [2021-11-02 22:37:43,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-11-02 22:37:43,554 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:37:43,554 INFO L513 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 5, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:37:43,604 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Forceful destruction successful, exit code 0 [2021-11-02 22:37:43,774 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60,43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:37:43,774 INFO L402 AbstractCegarLoop]: === Iteration 62 === Targeting cstrcatErr5REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:37:43,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:37:43,775 INFO L85 PathProgramCache]: Analyzing trace with hash 1695094619, now seen corresponding path program 9 times [2021-11-02 22:37:43,775 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:37:43,775 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [504396521] [2021-11-02 22:37:43,775 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:37:43,775 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:37:43,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:45,562 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:37:45,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:45,565 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 18 proven. 82 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-02 22:37:45,565 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:37:45,566 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [504396521] [2021-11-02 22:37:45,566 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [504396521] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:37:45,566 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1773765180] [2021-11-02 22:37:45,566 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-02 22:37:45,566 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:37:45,566 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:37:45,567 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:37:45,568 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2021-11-02 22:37:47,558 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-02 22:37:47,558 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:37:47,562 INFO L263 TraceCheckSpWp]: Trace formula consists of 324 conjuncts, 105 conjunts are in the unsatisfiable core [2021-11-02 22:37:47,563 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:37:47,605 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:37:47,618 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:37:47,618 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-02 22:37:48,742 INFO L388 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 25 treesize of output 21 [2021-11-02 22:37:49,502 INFO L354 Elim1Store]: treesize reduction 18, result has 72.3 percent of original size [2021-11-02 22:37:49,502 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 3 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 51 treesize of output 75 [2021-11-02 22:37:50,155 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 21 proven. 46 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-02 22:37:50,155 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1773765180] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:37:50,155 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:37:50,155 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 26] total 52 [2021-11-02 22:37:50,155 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [174035618] [2021-11-02 22:37:50,156 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2021-11-02 22:37:50,156 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:37:50,156 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-11-02 22:37:50,156 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=172, Invalid=2480, Unknown=0, NotChecked=0, Total=2652 [2021-11-02 22:37:50,157 INFO L87 Difference]: Start difference. First operand 727 states and 807 transitions. Second operand has 52 states, 50 states have (on average 2.16) internal successors, (108), 49 states have internal predecessors, (108), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:37:59,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:37:59,160 INFO L93 Difference]: Finished difference Result 825 states and 909 transitions. [2021-11-02 22:37:59,161 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-11-02 22:37:59,161 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 50 states have (on average 2.16) internal successors, (108), 49 states have internal predecessors, (108), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 72 [2021-11-02 22:37:59,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:37:59,164 INFO L225 Difference]: With dead ends: 825 [2021-11-02 22:37:59,164 INFO L226 Difference]: Without dead ends: 813 [2021-11-02 22:37:59,165 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2622 ImplicationChecksByTransitivity, 9.0s TimeCoverageRelationStatistics Valid=738, Invalid=8768, Unknown=0, NotChecked=0, Total=9506 [2021-11-02 22:37:59,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 813 states. [2021-11-02 22:37:59,171 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 813 to 747. [2021-11-02 22:37:59,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 747 states, 723 states have (on average 1.1217150760719226) internal successors, (811), 725 states have internal predecessors, (811), 20 states have call successors, (20), 20 states have call predecessors, (20), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:37:59,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 747 states to 747 states and 832 transitions. [2021-11-02 22:37:59,174 INFO L78 Accepts]: Start accepts. Automaton has 747 states and 832 transitions. Word has length 72 [2021-11-02 22:37:59,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:37:59,174 INFO L470 AbstractCegarLoop]: Abstraction has 747 states and 832 transitions. [2021-11-02 22:37:59,175 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 50 states have (on average 2.16) internal successors, (108), 49 states have internal predecessors, (108), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:37:59,175 INFO L276 IsEmpty]: Start isEmpty. Operand 747 states and 832 transitions. [2021-11-02 22:37:59,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-11-02 22:37:59,177 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:37:59,177 INFO L513 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:37:59,240 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2021-11-02 22:37:59,393 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable61 [2021-11-02 22:37:59,393 INFO L402 AbstractCegarLoop]: === Iteration 63 === Targeting cstrcatErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:37:59,393 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:37:59,393 INFO L85 PathProgramCache]: Analyzing trace with hash -819485192, now seen corresponding path program 9 times [2021-11-02 22:37:59,393 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:37:59,394 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1107129803] [2021-11-02 22:37:59,394 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:37:59,394 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:37:59,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:59,741 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:37:59,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:37:59,744 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 6 proven. 54 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-02 22:37:59,744 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:37:59,745 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1107129803] [2021-11-02 22:37:59,745 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1107129803] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:37:59,745 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1495090078] [2021-11-02 22:37:59,745 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-02 22:37:59,745 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:37:59,745 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:37:59,749 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:37:59,770 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2021-11-02 22:38:01,897 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-02 22:38:01,898 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:38:01,900 INFO L263 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 45 conjunts are in the unsatisfiable core [2021-11-02 22:38:01,901 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:38:02,395 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 15 proven. 45 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-02 22:38:02,396 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1495090078] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:38:02,396 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:38:02,396 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 30 [2021-11-02 22:38:02,396 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [476580355] [2021-11-02 22:38:02,397 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-02 22:38:02,397 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:38:02,397 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-02 22:38:02,397 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=823, Unknown=0, NotChecked=0, Total=930 [2021-11-02 22:38:02,398 INFO L87 Difference]: Start difference. First operand 747 states and 832 transitions. Second operand has 31 states, 30 states have (on average 3.3666666666666667) internal successors, (101), 28 states have internal predecessors, (101), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:38:03,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:38:03,306 INFO L93 Difference]: Finished difference Result 777 states and 857 transitions. [2021-11-02 22:38:03,307 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-02 22:38:03,307 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 3.3666666666666667) internal successors, (101), 28 states have internal predecessors, (101), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 73 [2021-11-02 22:38:03,307 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:38:03,310 INFO L225 Difference]: With dead ends: 777 [2021-11-02 22:38:03,310 INFO L226 Difference]: Without dead ends: 777 [2021-11-02 22:38:03,310 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 305 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=244, Invalid=1648, Unknown=0, NotChecked=0, Total=1892 [2021-11-02 22:38:03,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 777 states. [2021-11-02 22:38:03,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 777 to 764. [2021-11-02 22:38:03,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 764 states, 740 states have (on average 1.1189189189189188) internal successors, (828), 742 states have internal predecessors, (828), 20 states have call successors, (20), 20 states have call predecessors, (20), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:38:03,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 764 states to 764 states and 849 transitions. [2021-11-02 22:38:03,319 INFO L78 Accepts]: Start accepts. Automaton has 764 states and 849 transitions. Word has length 73 [2021-11-02 22:38:03,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:38:03,319 INFO L470 AbstractCegarLoop]: Abstraction has 764 states and 849 transitions. [2021-11-02 22:38:03,319 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 30 states have (on average 3.3666666666666667) internal successors, (101), 28 states have internal predecessors, (101), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:38:03,319 INFO L276 IsEmpty]: Start isEmpty. Operand 764 states and 849 transitions. [2021-11-02 22:38:03,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-02 22:38:03,321 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:38:03,321 INFO L513 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:38:03,350 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2021-11-02 22:38:03,521 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable62,45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:38:03,521 INFO L402 AbstractCegarLoop]: === Iteration 64 === Targeting cstrcatErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:38:03,522 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:38:03,522 INFO L85 PathProgramCache]: Analyzing trace with hash 365036993, now seen corresponding path program 17 times [2021-11-02 22:38:03,522 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:38:03,522 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1184933575] [2021-11-02 22:38:03,522 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:38:03,522 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:38:03,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:38:05,813 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:38:05,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:38:05,831 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 69 proven. 183 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:38:05,831 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:38:05,831 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1184933575] [2021-11-02 22:38:05,832 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1184933575] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:38:05,832 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1310660947] [2021-11-02 22:38:05,832 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-02 22:38:05,832 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:38:05,832 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:38:05,837 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:38:05,846 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2021-11-02 22:38:08,275 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 11 check-sat command(s) [2021-11-02 22:38:08,276 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:38:08,278 INFO L263 TraceCheckSpWp]: Trace formula consists of 317 conjuncts, 93 conjunts are in the unsatisfiable core [2021-11-02 22:38:08,281 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:38:08,351 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:38:08,351 INFO L388 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 1 case distinctions, treesize of input 18 treesize of output 23 [2021-11-02 22:38:08,822 INFO L388 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 25 treesize of output 21 [2021-11-02 22:38:10,968 INFO L354 Elim1Store]: treesize reduction 48, result has 47.3 percent of original size [2021-11-02 22:38:10,968 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 36 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 45 case distinctions, treesize of input 91 treesize of output 91 [2021-11-02 22:38:11,327 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2021-11-02 22:38:11,327 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1310660947] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:38:11,327 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:38:11,327 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 26] total 60 [2021-11-02 22:38:11,327 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [518070678] [2021-11-02 22:38:11,328 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2021-11-02 22:38:11,328 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:38:11,328 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-11-02 22:38:11,329 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=187, Invalid=3353, Unknown=0, NotChecked=0, Total=3540 [2021-11-02 22:38:11,329 INFO L87 Difference]: Start difference. First operand 764 states and 849 transitions. Second operand has 60 states, 58 states have (on average 1.7758620689655173) internal successors, (103), 57 states have internal predecessors, (103), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:38:23,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:38:23,049 INFO L93 Difference]: Finished difference Result 1029 states and 1143 transitions. [2021-11-02 22:38:23,049 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2021-11-02 22:38:23,050 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 58 states have (on average 1.7758620689655173) internal successors, (103), 57 states have internal predecessors, (103), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 74 [2021-11-02 22:38:23,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:38:23,054 INFO L225 Difference]: With dead ends: 1029 [2021-11-02 22:38:23,054 INFO L226 Difference]: Without dead ends: 1007 [2021-11-02 22:38:23,055 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 139 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5343 ImplicationChecksByTransitivity, 11.4s TimeCoverageRelationStatistics Valid=1200, Invalid=18540, Unknown=0, NotChecked=0, Total=19740 [2021-11-02 22:38:23,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1007 states. [2021-11-02 22:38:23,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1007 to 874. [2021-11-02 22:38:23,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 874 states, 846 states have (on average 1.1300236406619386) internal successors, (956), 848 states have internal predecessors, (956), 24 states have call successors, (24), 24 states have call predecessors, (24), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:38:23,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 874 states to 874 states and 981 transitions. [2021-11-02 22:38:23,066 INFO L78 Accepts]: Start accepts. Automaton has 874 states and 981 transitions. Word has length 74 [2021-11-02 22:38:23,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:38:23,067 INFO L470 AbstractCegarLoop]: Abstraction has 874 states and 981 transitions. [2021-11-02 22:38:23,067 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 58 states have (on average 1.7758620689655173) internal successors, (103), 57 states have internal predecessors, (103), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:38:23,067 INFO L276 IsEmpty]: Start isEmpty. Operand 874 states and 981 transitions. [2021-11-02 22:38:23,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-11-02 22:38:23,069 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:38:23,069 INFO L513 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 7, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:38:23,128 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Forceful destruction successful, exit code 0 [2021-11-02 22:38:23,287 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable63,46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:38:23,287 INFO L402 AbstractCegarLoop]: === Iteration 65 === Targeting cstrcatErr5REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:38:23,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:38:23,287 INFO L85 PathProgramCache]: Analyzing trace with hash -77807720, now seen corresponding path program 10 times [2021-11-02 22:38:23,287 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:38:23,288 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1037358085] [2021-11-02 22:38:23,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:38:23,288 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:38:23,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:38:23,776 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:38:23,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:38:23,779 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 66 proven. 113 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:38:23,779 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:38:23,780 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1037358085] [2021-11-02 22:38:23,780 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1037358085] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:38:23,780 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [95058655] [2021-11-02 22:38:23,780 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-02 22:38:23,780 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:38:23,780 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:38:23,785 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:38:23,801 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2021-11-02 22:38:26,069 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-02 22:38:26,069 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:38:26,072 INFO L263 TraceCheckSpWp]: Trace formula consists of 301 conjuncts, 83 conjunts are in the unsatisfiable core [2021-11-02 22:38:26,075 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:38:26,179 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:38:26,179 INFO L388 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 1 case distinctions, treesize of input 18 treesize of output 23 [2021-11-02 22:38:26,706 INFO L388 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 25 treesize of output 21 [2021-11-02 22:38:28,507 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:38:28,507 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:38:28,508 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:38:28,509 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:38:28,510 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:38:28,511 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:38:28,512 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:38:28,513 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:38:28,513 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:38:28,514 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:38:28,515 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:38:28,516 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:38:28,516 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:38:28,517 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:38:28,518 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:38:28,519 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:38:28,519 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:38:28,520 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:38:28,521 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:38:28,521 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:38:28,522 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:38:28,564 INFO L354 Elim1Store]: treesize reduction 36, result has 60.0 percent of original size [2021-11-02 22:38:28,564 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 21 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 96 treesize of output 102 [2021-11-02 22:38:28,963 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 0 proven. 59 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-11-02 22:38:28,963 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [95058655] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:38:28,963 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:38:28,963 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23] total 46 [2021-11-02 22:38:28,963 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1544318669] [2021-11-02 22:38:28,964 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2021-11-02 22:38:28,964 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:38:28,964 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-11-02 22:38:28,964 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=2030, Unknown=0, NotChecked=0, Total=2162 [2021-11-02 22:38:28,965 INFO L87 Difference]: Start difference. First operand 874 states and 981 transitions. Second operand has 47 states, 45 states have (on average 2.533333333333333) internal successors, (114), 44 states have internal predecessors, (114), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:38:41,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:38:41,293 INFO L93 Difference]: Finished difference Result 1151 states and 1260 transitions. [2021-11-02 22:38:41,293 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2021-11-02 22:38:41,293 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 45 states have (on average 2.533333333333333) internal successors, (114), 44 states have internal predecessors, (114), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 76 [2021-11-02 22:38:41,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:38:41,297 INFO L225 Difference]: With dead ends: 1151 [2021-11-02 22:38:41,298 INFO L226 Difference]: Without dead ends: 1102 [2021-11-02 22:38:41,298 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3585 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=804, Invalid=11852, Unknown=0, NotChecked=0, Total=12656 [2021-11-02 22:38:41,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1102 states. [2021-11-02 22:38:41,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1102 to 852. [2021-11-02 22:38:41,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 852 states, 824 states have (on average 1.116504854368932) internal successors, (920), 826 states have internal predecessors, (920), 24 states have call successors, (24), 24 states have call predecessors, (24), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:38:41,311 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 852 states to 852 states and 945 transitions. [2021-11-02 22:38:41,311 INFO L78 Accepts]: Start accepts. Automaton has 852 states and 945 transitions. Word has length 76 [2021-11-02 22:38:41,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:38:41,311 INFO L470 AbstractCegarLoop]: Abstraction has 852 states and 945 transitions. [2021-11-02 22:38:41,312 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 45 states have (on average 2.533333333333333) internal successors, (114), 44 states have internal predecessors, (114), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:38:41,312 INFO L276 IsEmpty]: Start isEmpty. Operand 852 states and 945 transitions. [2021-11-02 22:38:41,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-11-02 22:38:41,313 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:38:41,313 INFO L513 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:38:41,345 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Ended with exit code 0 [2021-11-02 22:38:41,513 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable64 [2021-11-02 22:38:41,514 INFO L402 AbstractCegarLoop]: === Iteration 66 === Targeting cstrcatErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:38:41,514 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:38:41,514 INFO L85 PathProgramCache]: Analyzing trace with hash 109590144, now seen corresponding path program 10 times [2021-11-02 22:38:41,514 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:38:41,514 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [837879035] [2021-11-02 22:38:41,514 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:38:41,514 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:38:41,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:38:42,876 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:38:42,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:38:42,880 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 16 proven. 107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:38:42,881 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:38:42,881 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [837879035] [2021-11-02 22:38:42,881 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [837879035] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:38:42,881 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [372438297] [2021-11-02 22:38:42,881 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-02 22:38:42,881 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:38:42,882 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:38:42,883 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:38:42,902 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2021-11-02 22:38:45,526 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-02 22:38:45,526 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:38:45,529 INFO L263 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 80 conjunts are in the unsatisfiable core [2021-11-02 22:38:45,533 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:38:45,579 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:38:45,580 INFO L388 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-02 22:38:45,590 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-02 22:38:46,412 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 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 [2021-11-02 22:38:46,474 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 26 [2021-11-02 22:38:46,909 INFO L354 Elim1Store]: treesize reduction 18, result has 50.0 percent of original size [2021-11-02 22:38:46,909 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 52 [2021-11-02 22:38:47,121 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 31 [2021-11-02 22:38:47,350 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 31 [2021-11-02 22:38:47,561 INFO L354 Elim1Store]: treesize reduction 40, result has 23.1 percent of original size [2021-11-02 22:38:47,562 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 36 treesize of output 35 [2021-11-02 22:38:47,736 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 34 [2021-11-02 22:38:47,742 INFO L354 Elim1Store]: treesize reduction 8, result has 27.3 percent of original size [2021-11-02 22:38:47,743 INFO L388 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 34 treesize of output 26 [2021-11-02 22:38:47,753 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 18 proven. 60 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-02 22:38:47,754 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [372438297] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:38:47,754 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:38:47,754 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 22] total 52 [2021-11-02 22:38:47,754 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [612280273] [2021-11-02 22:38:47,754 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2021-11-02 22:38:47,755 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:38:47,755 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-11-02 22:38:47,755 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=2501, Unknown=0, NotChecked=0, Total=2652 [2021-11-02 22:38:47,756 INFO L87 Difference]: Start difference. First operand 852 states and 945 transitions. Second operand has 52 states, 51 states have (on average 2.392156862745098) internal successors, (122), 49 states have internal predecessors, (122), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:38:58,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:38:58,885 INFO L93 Difference]: Finished difference Result 1311 states and 1439 transitions. [2021-11-02 22:38:58,889 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2021-11-02 22:38:58,889 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 51 states have (on average 2.392156862745098) internal successors, (122), 49 states have internal predecessors, (122), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 77 [2021-11-02 22:38:58,890 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:38:58,896 INFO L225 Difference]: With dead ends: 1311 [2021-11-02 22:38:58,896 INFO L226 Difference]: Without dead ends: 1107 [2021-11-02 22:38:58,898 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 61 SyntacticMatches, 1 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4107 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=1085, Invalid=15685, Unknown=0, NotChecked=0, Total=16770 [2021-11-02 22:38:58,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1107 states. [2021-11-02 22:38:58,918 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1107 to 1004. [2021-11-02 22:38:58,919 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1004 states, 972 states have (on average 1.118312757201646) internal successors, (1087), 974 states have internal predecessors, (1087), 28 states have call successors, (28), 28 states have call predecessors, (28), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:38:58,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1004 states to 1004 states and 1116 transitions. [2021-11-02 22:38:58,921 INFO L78 Accepts]: Start accepts. Automaton has 1004 states and 1116 transitions. Word has length 77 [2021-11-02 22:38:58,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:38:58,921 INFO L470 AbstractCegarLoop]: Abstraction has 1004 states and 1116 transitions. [2021-11-02 22:38:58,922 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 51 states have (on average 2.392156862745098) internal successors, (122), 49 states have internal predecessors, (122), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:38:58,922 INFO L276 IsEmpty]: Start isEmpty. Operand 1004 states and 1116 transitions. [2021-11-02 22:38:58,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-02 22:38:58,924 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:38:58,924 INFO L513 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 6, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:38:58,957 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Forceful destruction successful, exit code 0 [2021-11-02 22:38:59,124 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable65 [2021-11-02 22:38:59,124 INFO L402 AbstractCegarLoop]: === Iteration 67 === Targeting cstrcatErr5REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:38:59,125 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:38:59,125 INFO L85 PathProgramCache]: Analyzing trace with hash 295696023, now seen corresponding path program 11 times [2021-11-02 22:38:59,125 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:38:59,125 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1782185125] [2021-11-02 22:38:59,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:38:59,125 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:38:59,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:39:01,231 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:39:01,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:39:01,236 INFO L134 CoverageAnalysis]: Checked inductivity of 149 backedges. 24 proven. 113 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-02 22:39:01,236 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:39:01,236 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1782185125] [2021-11-02 22:39:01,236 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1782185125] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:39:01,236 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1762025528] [2021-11-02 22:39:01,236 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-02 22:39:01,237 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:39:01,237 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:39:01,241 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:39:01,257 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2021-11-02 22:39:04,169 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 8 check-sat command(s) [2021-11-02 22:39:04,169 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:39:04,172 INFO L263 TraceCheckSpWp]: Trace formula consists of 357 conjuncts, 87 conjunts are in the unsatisfiable core [2021-11-02 22:39:04,174 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:39:04,220 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:39:04,220 INFO L388 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 1 case distinctions, treesize of input 15 treesize of output 20 [2021-11-02 22:39:04,795 INFO L388 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 25 treesize of output 21 [2021-11-02 22:39:05,743 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:39:05,744 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:39:05,745 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:39:05,746 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:39:05,746 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:39:05,747 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:39:05,748 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:39:05,749 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:39:05,750 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:39:05,750 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:39:05,781 INFO L354 Elim1Store]: treesize reduction 26, result has 55.9 percent of original size [2021-11-02 22:39:05,781 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 67 treesize of output 65 [2021-11-02 22:39:06,349 INFO L134 CoverageAnalysis]: Checked inductivity of 149 backedges. 1 proven. 57 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-11-02 22:39:06,349 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1762025528] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:39:06,349 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:39:06,349 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 22] total 51 [2021-11-02 22:39:06,349 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1394077720] [2021-11-02 22:39:06,350 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-11-02 22:39:06,350 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:39:06,350 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-11-02 22:39:06,351 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=2401, Unknown=0, NotChecked=0, Total=2550 [2021-11-02 22:39:06,351 INFO L87 Difference]: Start difference. First operand 1004 states and 1116 transitions. Second operand has 51 states, 49 states have (on average 2.2857142857142856) internal successors, (112), 48 states have internal predecessors, (112), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:39:15,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:39:15,041 INFO L93 Difference]: Finished difference Result 1227 states and 1345 transitions. [2021-11-02 22:39:15,042 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2021-11-02 22:39:15,042 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 49 states have (on average 2.2857142857142856) internal successors, (112), 48 states have internal predecessors, (112), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 78 [2021-11-02 22:39:15,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:39:15,047 INFO L225 Difference]: With dead ends: 1227 [2021-11-02 22:39:15,047 INFO L226 Difference]: Without dead ends: 1196 [2021-11-02 22:39:15,048 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3057 ImplicationChecksByTransitivity, 7.9s TimeCoverageRelationStatistics Valid=735, Invalid=10821, Unknown=0, NotChecked=0, Total=11556 [2021-11-02 22:39:15,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1196 states. [2021-11-02 22:39:15,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1196 to 1028. [2021-11-02 22:39:15,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1028 states, 997 states have (on average 1.1213640922768304) internal successors, (1118), 999 states have internal predecessors, (1118), 27 states have call successors, (27), 27 states have call predecessors, (27), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:39:15,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1028 states to 1028 states and 1146 transitions. [2021-11-02 22:39:15,065 INFO L78 Accepts]: Start accepts. Automaton has 1028 states and 1146 transitions. Word has length 78 [2021-11-02 22:39:15,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:39:15,065 INFO L470 AbstractCegarLoop]: Abstraction has 1028 states and 1146 transitions. [2021-11-02 22:39:15,065 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 49 states have (on average 2.2857142857142856) internal successors, (112), 48 states have internal predecessors, (112), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:39:15,066 INFO L276 IsEmpty]: Start isEmpty. Operand 1028 states and 1146 transitions. [2021-11-02 22:39:15,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-02 22:39:15,068 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:39:15,068 INFO L513 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 4, 4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:39:15,122 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Forceful destruction successful, exit code 0 [2021-11-02 22:39:15,283 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable66,49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:39:15,283 INFO L402 AbstractCegarLoop]: === Iteration 68 === Targeting cstrcatErr5REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:39:15,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:39:15,283 INFO L85 PathProgramCache]: Analyzing trace with hash 519369885, now seen corresponding path program 12 times [2021-11-02 22:39:15,283 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:39:15,283 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [819609707] [2021-11-02 22:39:15,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:39:15,284 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:39:15,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:39:16,794 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:39:16,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:39:16,798 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 12 proven. 87 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-02 22:39:16,799 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:39:16,799 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [819609707] [2021-11-02 22:39:16,799 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [819609707] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:39:16,799 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1161713915] [2021-11-02 22:39:16,799 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-02 22:39:16,799 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:39:16,800 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:39:16,801 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:39:16,817 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2021-11-02 22:39:20,173 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-11-02 22:39:20,173 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:39:20,177 INFO L263 TraceCheckSpWp]: Trace formula consists of 363 conjuncts, 54 conjunts are in the unsatisfiable core [2021-11-02 22:39:20,179 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:39:21,228 INFO L388 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 21 treesize of output 17 [2021-11-02 22:39:21,567 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-02 22:39:21,568 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 31 treesize of output 15 [2021-11-02 22:39:21,613 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 18 proven. 81 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-02 22:39:21,613 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1161713915] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:39:21,613 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:39:21,613 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 23] total 42 [2021-11-02 22:39:21,614 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1053688331] [2021-11-02 22:39:21,614 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2021-11-02 22:39:21,614 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:39:21,614 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-11-02 22:39:21,614 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=1548, Unknown=0, NotChecked=0, Total=1722 [2021-11-02 22:39:21,615 INFO L87 Difference]: Start difference. First operand 1028 states and 1146 transitions. Second operand has 42 states, 40 states have (on average 2.775) internal successors, (111), 40 states have internal predecessors, (111), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:39:24,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:39:24,377 INFO L93 Difference]: Finished difference Result 1036 states and 1147 transitions. [2021-11-02 22:39:24,377 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-11-02 22:39:24,377 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 40 states have (on average 2.775) internal successors, (111), 40 states have internal predecessors, (111), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 78 [2021-11-02 22:39:24,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:39:24,381 INFO L225 Difference]: With dead ends: 1036 [2021-11-02 22:39:24,382 INFO L226 Difference]: Without dead ends: 1016 [2021-11-02 22:39:24,382 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 61 SyntacticMatches, 2 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1406 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=568, Invalid=4544, Unknown=0, NotChecked=0, Total=5112 [2021-11-02 22:39:24,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1016 states. [2021-11-02 22:39:24,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1016 to 1004. [2021-11-02 22:39:24,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1004 states, 975 states have (on average 1.116923076923077) internal successors, (1089), 977 states have internal predecessors, (1089), 25 states have call successors, (25), 25 states have call predecessors, (25), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:39:24,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1004 states to 1004 states and 1115 transitions. [2021-11-02 22:39:24,399 INFO L78 Accepts]: Start accepts. Automaton has 1004 states and 1115 transitions. Word has length 78 [2021-11-02 22:39:24,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:39:24,399 INFO L470 AbstractCegarLoop]: Abstraction has 1004 states and 1115 transitions. [2021-11-02 22:39:24,399 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 40 states have (on average 2.775) internal successors, (111), 40 states have internal predecessors, (111), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:39:24,399 INFO L276 IsEmpty]: Start isEmpty. Operand 1004 states and 1115 transitions. [2021-11-02 22:39:24,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-02 22:39:24,401 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:39:24,401 INFO L513 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:39:24,435 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Forceful destruction successful, exit code 0 [2021-11-02 22:39:24,601 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable67 [2021-11-02 22:39:24,602 INFO L402 AbstractCegarLoop]: === Iteration 69 === Targeting cstrcatErr5REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:39:24,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:39:24,602 INFO L85 PathProgramCache]: Analyzing trace with hash -168280157, now seen corresponding path program 13 times [2021-11-02 22:39:24,602 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:39:24,602 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [864208703] [2021-11-02 22:39:24,602 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:39:24,602 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:39:24,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:39:25,179 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:39:25,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:39:25,194 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 10 proven. 67 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-11-02 22:39:25,195 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:39:25,195 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [864208703] [2021-11-02 22:39:25,195 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [864208703] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:39:25,195 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1206885926] [2021-11-02 22:39:25,195 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-02 22:39:25,195 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:39:25,196 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:39:25,206 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:39:25,243 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2021-11-02 22:39:27,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:39:27,938 INFO L263 TraceCheckSpWp]: Trace formula consists of 369 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-02 22:39:27,942 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:39:28,813 INFO L388 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 21 treesize of output 17 [2021-11-02 22:39:29,032 INFO L354 Elim1Store]: treesize reduction 8, result has 27.3 percent of original size [2021-11-02 22:39:29,032 INFO L388 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 33 treesize of output 25 [2021-11-02 22:39:29,082 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 19 proven. 58 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-11-02 22:39:29,082 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1206885926] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:39:29,082 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:39:29,082 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 35 [2021-11-02 22:39:29,083 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1350906887] [2021-11-02 22:39:29,085 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-02 22:39:29,085 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:39:29,086 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-02 22:39:29,086 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=1041, Unknown=0, NotChecked=0, Total=1190 [2021-11-02 22:39:29,086 INFO L87 Difference]: Start difference. First operand 1004 states and 1115 transitions. Second operand has 35 states, 33 states have (on average 3.1515151515151514) internal successors, (104), 32 states have internal predecessors, (104), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:39:30,436 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:39:30,436 INFO L93 Difference]: Finished difference Result 1000 states and 1110 transitions. [2021-11-02 22:39:30,437 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-02 22:39:30,437 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 33 states have (on average 3.1515151515151514) internal successors, (104), 32 states have internal predecessors, (104), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 78 [2021-11-02 22:39:30,437 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:39:30,441 INFO L225 Difference]: With dead ends: 1000 [2021-11-02 22:39:30,441 INFO L226 Difference]: Without dead ends: 994 [2021-11-02 22:39:30,441 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 583 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=433, Invalid=2219, Unknown=0, NotChecked=0, Total=2652 [2021-11-02 22:39:30,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 994 states. [2021-11-02 22:39:30,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 994 to 994. [2021-11-02 22:39:30,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 994 states, 966 states have (on average 1.1159420289855073) internal successors, (1078), 968 states have internal predecessors, (1078), 24 states have call successors, (24), 24 states have call predecessors, (24), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:39:30,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 994 states to 994 states and 1103 transitions. [2021-11-02 22:39:30,458 INFO L78 Accepts]: Start accepts. Automaton has 994 states and 1103 transitions. Word has length 78 [2021-11-02 22:39:30,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:39:30,458 INFO L470 AbstractCegarLoop]: Abstraction has 994 states and 1103 transitions. [2021-11-02 22:39:30,459 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 33 states have (on average 3.1515151515151514) internal successors, (104), 32 states have internal predecessors, (104), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:39:30,459 INFO L276 IsEmpty]: Start isEmpty. Operand 994 states and 1103 transitions. [2021-11-02 22:39:30,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-02 22:39:30,461 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:39:30,461 INFO L513 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:39:30,516 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Ended with exit code 0 [2021-11-02 22:39:30,683 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable68 [2021-11-02 22:39:30,683 INFO L402 AbstractCegarLoop]: === Iteration 70 === Targeting cstrcatErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:39:30,683 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:39:30,683 INFO L85 PathProgramCache]: Analyzing trace with hash -839984067, now seen corresponding path program 18 times [2021-11-02 22:39:30,683 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:39:30,683 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [805442260] [2021-11-02 22:39:30,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:39:30,684 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:39:30,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:39:33,828 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:39:33,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:39:33,832 INFO L134 CoverageAnalysis]: Checked inductivity of 311 backedges. 86 proven. 224 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:39:33,832 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:39:33,833 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [805442260] [2021-11-02 22:39:33,833 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [805442260] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:39:33,833 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [667491059] [2021-11-02 22:39:33,833 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-02 22:39:33,833 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:39:33,833 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:39:33,834 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:39:33,835 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2021-11-02 22:39:36,621 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 12 check-sat command(s) [2021-11-02 22:39:36,621 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:39:36,625 INFO L263 TraceCheckSpWp]: Trace formula consists of 339 conjuncts, 114 conjunts are in the unsatisfiable core [2021-11-02 22:39:36,627 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:39:37,854 INFO L388 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 54 treesize of output 50 [2021-11-02 22:39:40,726 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-02 22:39:40,726 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 45 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 45 case distinctions, treesize of input 87 treesize of output 43 [2021-11-02 22:39:40,737 INFO L134 CoverageAnalysis]: Checked inductivity of 311 backedges. 30 proven. 280 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:39:40,738 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [667491059] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:39:40,738 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:39:40,738 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 39] total 68 [2021-11-02 22:39:40,738 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [790574699] [2021-11-02 22:39:40,738 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2021-11-02 22:39:40,739 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:39:40,739 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2021-11-02 22:39:40,740 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=363, Invalid=4193, Unknown=0, NotChecked=0, Total=4556 [2021-11-02 22:39:40,740 INFO L87 Difference]: Start difference. First operand 994 states and 1103 transitions. Second operand has 68 states, 67 states have (on average 2.0) internal successors, (134), 66 states have internal predecessors, (134), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:39:46,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:39:46,614 INFO L93 Difference]: Finished difference Result 1278 states and 1414 transitions. [2021-11-02 22:39:46,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2021-11-02 22:39:46,614 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 67 states have (on average 2.0) internal successors, (134), 66 states have internal predecessors, (134), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 80 [2021-11-02 22:39:46,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:39:46,620 INFO L225 Difference]: With dead ends: 1278 [2021-11-02 22:39:46,620 INFO L226 Difference]: Without dead ends: 1254 [2021-11-02 22:39:46,621 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 50 SyntacticMatches, 4 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4460 ImplicationChecksByTransitivity, 7.8s TimeCoverageRelationStatistics Valid=1081, Invalid=13925, Unknown=0, NotChecked=0, Total=15006 [2021-11-02 22:39:46,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1254 states. [2021-11-02 22:39:46,632 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1254 to 1128. [2021-11-02 22:39:46,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1128 states, 1095 states have (on average 1.1242009132420092) internal successors, (1231), 1097 states have internal predecessors, (1231), 29 states have call successors, (29), 29 states have call predecessors, (29), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:39:46,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1128 states to 1128 states and 1261 transitions. [2021-11-02 22:39:46,636 INFO L78 Accepts]: Start accepts. Automaton has 1128 states and 1261 transitions. Word has length 80 [2021-11-02 22:39:46,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:39:46,637 INFO L470 AbstractCegarLoop]: Abstraction has 1128 states and 1261 transitions. [2021-11-02 22:39:46,637 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 67 states have (on average 2.0) internal successors, (134), 66 states have internal predecessors, (134), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:39:46,637 INFO L276 IsEmpty]: Start isEmpty. Operand 1128 states and 1261 transitions. [2021-11-02 22:39:46,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-02 22:39:46,640 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:39:46,640 INFO L513 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 8, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:39:46,688 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Forceful destruction successful, exit code 0 [2021-11-02 22:39:46,865 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable69,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:39:46,865 INFO L402 AbstractCegarLoop]: === Iteration 71 === Targeting cstrcatErr5REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:39:46,865 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:39:46,865 INFO L85 PathProgramCache]: Analyzing trace with hash -1323896684, now seen corresponding path program 14 times [2021-11-02 22:39:46,865 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:39:46,866 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1389753573] [2021-11-02 22:39:46,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:39:46,866 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:39:46,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:39:47,485 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:39:47,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:39:47,488 INFO L134 CoverageAnalysis]: Checked inductivity of 229 backedges. 91 proven. 137 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:39:47,489 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:39:47,489 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1389753573] [2021-11-02 22:39:47,489 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1389753573] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:39:47,489 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2141853066] [2021-11-02 22:39:47,489 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:39:47,489 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:39:47,489 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:39:47,493 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:39:47,509 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2021-11-02 22:39:50,467 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-02 22:39:50,468 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:39:50,470 INFO L263 TraceCheckSpWp]: Trace formula consists of 362 conjuncts, 70 conjunts are in the unsatisfiable core [2021-11-02 22:39:50,472 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:39:50,508 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:39:50,508 INFO L388 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-02 22:39:51,747 INFO L134 CoverageAnalysis]: Checked inductivity of 229 backedges. 120 proven. 108 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:39:51,748 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2141853066] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:39:51,748 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:39:51,748 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25] total 49 [2021-11-02 22:39:51,748 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [521051210] [2021-11-02 22:39:51,748 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-11-02 22:39:51,748 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:39:51,749 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-11-02 22:39:51,749 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=251, Invalid=2199, Unknown=0, NotChecked=0, Total=2450 [2021-11-02 22:39:51,749 INFO L87 Difference]: Start difference. First operand 1128 states and 1261 transitions. Second operand has 50 states, 49 states have (on average 3.0816326530612246) internal successors, (151), 47 states have internal predecessors, (151), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:39:53,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:39:53,557 INFO L93 Difference]: Finished difference Result 1429 states and 1566 transitions. [2021-11-02 22:39:53,557 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-02 22:39:53,557 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 49 states have (on average 3.0816326530612246) internal successors, (151), 47 states have internal predecessors, (151), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 82 [2021-11-02 22:39:53,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:39:53,563 INFO L225 Difference]: With dead ends: 1429 [2021-11-02 22:39:53,563 INFO L226 Difference]: Without dead ends: 1388 [2021-11-02 22:39:53,563 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 59 SyntacticMatches, 1 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1265 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=368, Invalid=3538, Unknown=0, NotChecked=0, Total=3906 [2021-11-02 22:39:53,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1388 states. [2021-11-02 22:39:53,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1388 to 1084. [2021-11-02 22:39:53,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1084 states, 1051 states have (on average 1.1103710751665081) internal successors, (1167), 1053 states have internal predecessors, (1167), 29 states have call successors, (29), 29 states have call predecessors, (29), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:39:53,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1084 states to 1084 states and 1197 transitions. [2021-11-02 22:39:53,583 INFO L78 Accepts]: Start accepts. Automaton has 1084 states and 1197 transitions. Word has length 82 [2021-11-02 22:39:53,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:39:53,583 INFO L470 AbstractCegarLoop]: Abstraction has 1084 states and 1197 transitions. [2021-11-02 22:39:53,584 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 49 states have (on average 3.0816326530612246) internal successors, (151), 47 states have internal predecessors, (151), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:39:53,584 INFO L276 IsEmpty]: Start isEmpty. Operand 1084 states and 1197 transitions. [2021-11-02 22:39:53,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-02 22:39:53,586 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:39:53,587 INFO L513 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:39:53,632 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Ended with exit code 0 [2021-11-02 22:39:53,801 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70,53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:39:53,801 INFO L402 AbstractCegarLoop]: === Iteration 72 === Targeting cstrcatErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:39:53,801 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:39:53,801 INFO L85 PathProgramCache]: Analyzing trace with hash 1064501632, now seen corresponding path program 19 times [2021-11-02 22:39:53,802 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:39:53,802 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [330869167] [2021-11-02 22:39:53,802 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:39:53,802 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:39:53,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:39:54,453 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:39:54,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:39:54,455 INFO L134 CoverageAnalysis]: Checked inductivity of 352 backedges. 153 proven. 199 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:39:54,456 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:39:54,456 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [330869167] [2021-11-02 22:39:54,456 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [330869167] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:39:54,456 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [33590944] [2021-11-02 22:39:54,456 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-02 22:39:54,456 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:39:54,456 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:39:54,457 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:39:54,525 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Waiting until timeout for monitored process [2021-11-02 22:39:57,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:39:57,263 INFO L263 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 72 conjunts are in the unsatisfiable core [2021-11-02 22:39:57,264 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:39:57,295 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:39:57,295 INFO L388 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-02 22:39:58,525 INFO L134 CoverageAnalysis]: Checked inductivity of 352 backedges. 190 proven. 162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:39:58,525 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [33590944] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:39:58,525 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:39:58,525 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 55 [2021-11-02 22:39:58,525 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1142298236] [2021-11-02 22:39:58,526 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2021-11-02 22:39:58,526 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:39:58,526 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-11-02 22:39:58,527 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=327, Invalid=2753, Unknown=0, NotChecked=0, Total=3080 [2021-11-02 22:39:58,527 INFO L87 Difference]: Start difference. First operand 1084 states and 1197 transitions. Second operand has 56 states, 55 states have (on average 2.8181818181818183) internal successors, (155), 53 states have internal predecessors, (155), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:40:00,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:40:00,443 INFO L93 Difference]: Finished difference Result 1452 states and 1589 transitions. [2021-11-02 22:40:00,443 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-02 22:40:00,443 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 55 states have (on average 2.8181818181818183) internal successors, (155), 53 states have internal predecessors, (155), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 84 [2021-11-02 22:40:00,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:40:00,448 INFO L225 Difference]: With dead ends: 1452 [2021-11-02 22:40:00,448 INFO L226 Difference]: Without dead ends: 1452 [2021-11-02 22:40:00,449 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 58 SyntacticMatches, 1 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1633 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=456, Invalid=4374, Unknown=0, NotChecked=0, Total=4830 [2021-11-02 22:40:00,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1452 states. [2021-11-02 22:40:00,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1452 to 1096. [2021-11-02 22:40:00,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1096 states, 1063 states have (on average 1.1138287864534338) internal successors, (1184), 1065 states have internal predecessors, (1184), 29 states have call successors, (29), 29 states have call predecessors, (29), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:40:00,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1096 states to 1096 states and 1214 transitions. [2021-11-02 22:40:00,462 INFO L78 Accepts]: Start accepts. Automaton has 1096 states and 1214 transitions. Word has length 84 [2021-11-02 22:40:00,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:40:00,462 INFO L470 AbstractCegarLoop]: Abstraction has 1096 states and 1214 transitions. [2021-11-02 22:40:00,463 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 55 states have (on average 2.8181818181818183) internal successors, (155), 53 states have internal predecessors, (155), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:40:00,463 INFO L276 IsEmpty]: Start isEmpty. Operand 1096 states and 1214 transitions. [2021-11-02 22:40:00,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-02 22:40:00,464 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:40:00,464 INFO L513 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 7, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:40:00,491 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Forceful destruction successful, exit code 0 [2021-11-02 22:40:00,665 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable71,54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:40:00,665 INFO L402 AbstractCegarLoop]: === Iteration 73 === Targeting cstrcatErr5REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:40:00,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:40:00,665 INFO L85 PathProgramCache]: Analyzing trace with hash -324450157, now seen corresponding path program 15 times [2021-11-02 22:40:00,665 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:40:00,666 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [72253468] [2021-11-02 22:40:00,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:40:00,666 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:40:00,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:40:02,291 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:40:02,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:40:02,294 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 36 proven. 144 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-02 22:40:02,294 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:40:02,294 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [72253468] [2021-11-02 22:40:02,294 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [72253468] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:40:02,294 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1582568261] [2021-11-02 22:40:02,294 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-02 22:40:02,294 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:40:02,295 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:40:02,295 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:40:02,296 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2021-11-02 22:40:05,209 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-02 22:40:05,209 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:40:05,213 INFO L263 TraceCheckSpWp]: Trace formula consists of 368 conjuncts, 83 conjunts are in the unsatisfiable core [2021-11-02 22:40:05,214 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:40:05,253 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:40:05,253 INFO L388 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 1 case distinctions, treesize of input 15 treesize of output 20 [2021-11-02 22:40:05,760 INFO L388 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 25 treesize of output 21 [2021-11-02 22:40:31,631 INFO L354 Elim1Store]: treesize reduction 14, result has 92.5 percent of original size [2021-11-02 22:40:31,631 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 7 select indices, 7 select index equivalence classes, 0 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 21 case distinctions, treesize of input 99 treesize of output 240 [2021-11-02 22:41:26,075 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 1 proven. 71 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-11-02 22:41:26,076 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1582568261] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:41:26,076 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:41:26,076 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 25] total 57 [2021-11-02 22:41:26,076 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1893733788] [2021-11-02 22:41:26,077 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2021-11-02 22:41:26,077 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:41:26,077 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-11-02 22:41:26,078 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=232, Invalid=2953, Unknown=7, NotChecked=0, Total=3192 [2021-11-02 22:41:26,078 INFO L87 Difference]: Start difference. First operand 1096 states and 1214 transitions. Second operand has 57 states, 55 states have (on average 2.1818181818181817) internal successors, (120), 54 states have internal predecessors, (120), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:42:15,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:42:15,275 INFO L93 Difference]: Finished difference Result 1302 states and 1428 transitions. [2021-11-02 22:42:15,275 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2021-11-02 22:42:15,276 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 55 states have (on average 2.1818181818181817) internal successors, (120), 54 states have internal predecessors, (120), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 84 [2021-11-02 22:42:15,276 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:42:15,281 INFO L225 Difference]: With dead ends: 1302 [2021-11-02 22:42:15,281 INFO L226 Difference]: Without dead ends: 1253 [2021-11-02 22:42:15,283 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4743 ImplicationChecksByTransitivity, 51.5s TimeCoverageRelationStatistics Valid=1304, Invalid=14187, Unknown=9, NotChecked=0, Total=15500 [2021-11-02 22:42:15,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1253 states. [2021-11-02 22:42:15,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1253 to 1122. [2021-11-02 22:42:15,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1122 states, 1091 states have (on average 1.1173235563703026) internal successors, (1219), 1093 states have internal predecessors, (1219), 27 states have call successors, (27), 27 states have call predecessors, (27), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:42:15,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1122 states to 1122 states and 1247 transitions. [2021-11-02 22:42:15,296 INFO L78 Accepts]: Start accepts. Automaton has 1122 states and 1247 transitions. Word has length 84 [2021-11-02 22:42:15,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:42:15,296 INFO L470 AbstractCegarLoop]: Abstraction has 1122 states and 1247 transitions. [2021-11-02 22:42:15,297 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 55 states have (on average 2.1818181818181817) internal successors, (120), 54 states have internal predecessors, (120), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:42:15,297 INFO L276 IsEmpty]: Start isEmpty. Operand 1122 states and 1247 transitions. [2021-11-02 22:42:15,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-11-02 22:42:15,299 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:42:15,299 INFO L513 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:42:15,346 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Forceful destruction successful, exit code 0 [2021-11-02 22:42:15,513 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable72,55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:42:15,513 INFO L402 AbstractCegarLoop]: === Iteration 74 === Targeting cstrcatErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:42:15,513 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:42:15,513 INFO L85 PathProgramCache]: Analyzing trace with hash -588317062, now seen corresponding path program 11 times [2021-11-02 22:42:15,513 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:42:15,514 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [329727953] [2021-11-02 22:42:15,514 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:42:15,514 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:42:15,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:42:15,856 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:42:15,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:42:15,860 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 15 proven. 80 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-02 22:42:15,860 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:42:15,860 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [329727953] [2021-11-02 22:42:15,860 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [329727953] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:42:15,860 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [536174943] [2021-11-02 22:42:15,860 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-02 22:42:15,860 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:42:15,860 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:42:15,862 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:42:15,877 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Waiting until timeout for monitored process [2021-11-02 22:42:18,999 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2021-11-02 22:42:18,999 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:42:19,003 INFO L263 TraceCheckSpWp]: Trace formula consists of 393 conjuncts, 86 conjunts are in the unsatisfiable core [2021-11-02 22:42:19,005 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:42:19,030 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-02 22:42:19,035 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-02 22:42:19,992 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 28 proven. 67 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-02 22:42:19,993 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [536174943] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:42:19,993 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:42:19,993 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 15] total 32 [2021-11-02 22:42:19,993 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1871591614] [2021-11-02 22:42:19,993 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-02 22:42:19,994 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:42:19,994 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-02 22:42:19,994 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=957, Unknown=0, NotChecked=0, Total=1056 [2021-11-02 22:42:19,995 INFO L87 Difference]: Start difference. First operand 1122 states and 1247 transitions. Second operand has 33 states, 32 states have (on average 3.65625) internal successors, (117), 30 states have internal predecessors, (117), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:42:20,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:42:20,978 INFO L93 Difference]: Finished difference Result 1159 states and 1278 transitions. [2021-11-02 22:42:20,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-02 22:42:20,979 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 32 states have (on average 3.65625) internal successors, (117), 30 states have internal predecessors, (117), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 85 [2021-11-02 22:42:20,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:42:20,982 INFO L225 Difference]: With dead ends: 1159 [2021-11-02 22:42:20,982 INFO L226 Difference]: Without dead ends: 1159 [2021-11-02 22:42:20,983 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 359 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=188, Invalid=1704, Unknown=0, NotChecked=0, Total=1892 [2021-11-02 22:42:20,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1159 states. [2021-11-02 22:42:20,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1159 to 1143. [2021-11-02 22:42:20,994 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1143 states, 1112 states have (on average 1.1151079136690647) internal successors, (1240), 1114 states have internal predecessors, (1240), 27 states have call successors, (27), 27 states have call predecessors, (27), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:42:20,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1143 states to 1143 states and 1268 transitions. [2021-11-02 22:42:20,995 INFO L78 Accepts]: Start accepts. Automaton has 1143 states and 1268 transitions. Word has length 85 [2021-11-02 22:42:20,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:42:20,996 INFO L470 AbstractCegarLoop]: Abstraction has 1143 states and 1268 transitions. [2021-11-02 22:42:20,996 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 32 states have (on average 3.65625) internal successors, (117), 30 states have internal predecessors, (117), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:42:20,996 INFO L276 IsEmpty]: Start isEmpty. Operand 1143 states and 1268 transitions. [2021-11-02 22:42:20,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-02 22:42:20,997 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:42:20,998 INFO L513 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:42:21,028 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Forceful destruction successful, exit code 0 [2021-11-02 22:42:21,201 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable73,56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:42:21,201 INFO L402 AbstractCegarLoop]: === Iteration 75 === Targeting cstrcatErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:42:21,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:42:21,201 INFO L85 PathProgramCache]: Analyzing trace with hash 783852921, now seen corresponding path program 20 times [2021-11-02 22:42:21,202 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:42:21,202 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1530390176] [2021-11-02 22:42:21,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:42:21,202 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:42:21,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:42:24,259 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:42:24,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:42:24,263 INFO L134 CoverageAnalysis]: Checked inductivity of 375 backedges. 105 proven. 269 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:42:24,263 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:42:24,263 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1530390176] [2021-11-02 22:42:24,263 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1530390176] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:42:24,264 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1941381326] [2021-11-02 22:42:24,264 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:42:24,264 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:42:24,264 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:42:24,264 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:42:24,265 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Waiting until timeout for monitored process [2021-11-02 22:42:27,153 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-02 22:42:27,153 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:42:27,156 INFO L263 TraceCheckSpWp]: Trace formula consists of 361 conjuncts, 120 conjunts are in the unsatisfiable core [2021-11-02 22:42:27,157 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:42:28,434 INFO L388 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 53 treesize of output 49 [2021-11-02 22:42:31,425 INFO L134 CoverageAnalysis]: Checked inductivity of 375 backedges. 33 proven. 341 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:42:31,425 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1941381326] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:42:31,425 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:42:31,425 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 42] total 76 [2021-11-02 22:42:31,425 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [978428104] [2021-11-02 22:42:31,426 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 76 states [2021-11-02 22:42:31,426 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:42:31,426 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2021-11-02 22:42:31,426 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=520, Invalid=5180, Unknown=0, NotChecked=0, Total=5700 [2021-11-02 22:42:31,426 INFO L87 Difference]: Start difference. First operand 1143 states and 1268 transitions. Second operand has 76 states, 75 states have (on average 2.013333333333333) internal successors, (151), 74 states have internal predecessors, (151), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:42:38,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:42:38,481 INFO L93 Difference]: Finished difference Result 1449 states and 1602 transitions. [2021-11-02 22:42:38,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2021-11-02 22:42:38,488 INFO L78 Accepts]: Start accepts. Automaton has has 76 states, 75 states have (on average 2.013333333333333) internal successors, (151), 74 states have internal predecessors, (151), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 86 [2021-11-02 22:42:38,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:42:38,491 INFO L225 Difference]: With dead ends: 1449 [2021-11-02 22:42:38,491 INFO L226 Difference]: Without dead ends: 1423 [2021-11-02 22:42:38,492 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 51 SyntacticMatches, 4 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5765 ImplicationChecksByTransitivity, 9.4s TimeCoverageRelationStatistics Valid=1495, Invalid=17137, Unknown=0, NotChecked=0, Total=18632 [2021-11-02 22:42:38,492 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1423 states. [2021-11-02 22:42:38,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1423 to 1287. [2021-11-02 22:42:38,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1287 states, 1251 states have (on average 1.1223021582733812) internal successors, (1404), 1253 states have internal predecessors, (1404), 32 states have call successors, (32), 32 states have call predecessors, (32), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:42:38,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1287 states to 1287 states and 1437 transitions. [2021-11-02 22:42:38,502 INFO L78 Accepts]: Start accepts. Automaton has 1287 states and 1437 transitions. Word has length 86 [2021-11-02 22:42:38,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:42:38,502 INFO L470 AbstractCegarLoop]: Abstraction has 1287 states and 1437 transitions. [2021-11-02 22:42:38,503 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 76 states, 75 states have (on average 2.013333333333333) internal successors, (151), 74 states have internal predecessors, (151), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:42:38,503 INFO L276 IsEmpty]: Start isEmpty. Operand 1287 states and 1437 transitions. [2021-11-02 22:42:38,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-11-02 22:42:38,504 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:42:38,504 INFO L513 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 9, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:42:38,533 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Ended with exit code 0 [2021-11-02 22:42:38,705 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable74 [2021-11-02 22:42:38,705 INFO L402 AbstractCegarLoop]: === Iteration 76 === Targeting cstrcatErr5REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:42:38,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:42:38,705 INFO L85 PathProgramCache]: Analyzing trace with hash 1953449040, now seen corresponding path program 16 times [2021-11-02 22:42:38,705 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:42:38,705 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [108625952] [2021-11-02 22:42:38,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:42:38,706 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:42:38,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:42:39,326 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:42:39,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:42:39,328 INFO L134 CoverageAnalysis]: Checked inductivity of 284 backedges. 120 proven. 163 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:42:39,328 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:42:39,328 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [108625952] [2021-11-02 22:42:39,329 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [108625952] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:42:39,329 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [645179312] [2021-11-02 22:42:39,329 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-02 22:42:39,329 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:42:39,329 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:42:39,330 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:42:39,330 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Waiting until timeout for monitored process [2021-11-02 22:42:42,383 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-02 22:42:42,383 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:42:42,385 INFO L263 TraceCheckSpWp]: Trace formula consists of 339 conjuncts, 97 conjunts are in the unsatisfiable core [2021-11-02 22:42:42,387 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:42:42,503 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:42:42,503 INFO L388 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 1 case distinctions, treesize of input 18 treesize of output 23 [2021-11-02 22:42:42,974 INFO L388 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 25 treesize of output 21 [2021-11-02 22:42:45,323 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:42:45,324 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:42:45,325 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:42:45,326 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:42:45,326 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:42:45,327 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:42:45,328 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:42:45,328 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:42:45,338 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:42:45,340 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:42:45,341 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:42:45,342 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:42:45,342 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:42:45,343 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:42:45,344 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:42:45,345 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:42:45,346 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:42:45,347 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:42:45,348 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:42:45,349 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:42:45,350 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:42:45,351 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:42:45,352 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:42:45,353 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:42:45,354 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:42:45,355 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:42:45,356 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:42:45,356 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:42:45,357 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:42:45,358 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:42:45,359 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:42:45,360 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:42:45,361 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:42:45,362 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:42:45,365 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:42:45,366 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:42:45,418 INFO L354 Elim1Store]: treesize reduction 48, result has 58.6 percent of original size [2021-11-02 22:42:45,419 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 36 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 45 case distinctions, treesize of input 116 treesize of output 124 [2021-11-02 22:42:46,009 INFO L134 CoverageAnalysis]: Checked inductivity of 284 backedges. 0 proven. 93 refuted. 0 times theorem prover too weak. 191 trivial. 0 not checked. [2021-11-02 22:42:46,009 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [645179312] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:42:46,009 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:42:46,009 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27] total 54 [2021-11-02 22:42:46,010 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1954001640] [2021-11-02 22:42:46,010 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-02 22:42:46,010 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:42:46,010 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-02 22:42:46,011 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=2803, Unknown=0, NotChecked=0, Total=2970 [2021-11-02 22:42:46,011 INFO L87 Difference]: Start difference. First operand 1287 states and 1437 transitions. Second operand has 55 states, 53 states have (on average 2.452830188679245) internal successors, (130), 52 states have internal predecessors, (130), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:43:04,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:43:04,285 INFO L93 Difference]: Finished difference Result 1683 states and 1837 transitions. [2021-11-02 22:43:04,285 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2021-11-02 22:43:04,286 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 53 states have (on average 2.452830188679245) internal successors, (130), 52 states have internal predecessors, (130), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 88 [2021-11-02 22:43:04,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:43:04,287 INFO L225 Difference]: With dead ends: 1683 [2021-11-02 22:43:04,287 INFO L226 Difference]: Without dead ends: 1619 [2021-11-02 22:43:04,288 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5482 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=1050, Invalid=17582, Unknown=0, NotChecked=0, Total=18632 [2021-11-02 22:43:04,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1619 states. [2021-11-02 22:43:04,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1619 to 1237. [2021-11-02 22:43:04,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1237 states, 1201 states have (on average 1.1099084096586178) internal successors, (1333), 1203 states have internal predecessors, (1333), 32 states have call successors, (32), 32 states have call predecessors, (32), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:43:04,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1237 states to 1237 states and 1366 transitions. [2021-11-02 22:43:04,303 INFO L78 Accepts]: Start accepts. Automaton has 1237 states and 1366 transitions. Word has length 88 [2021-11-02 22:43:04,303 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:43:04,304 INFO L470 AbstractCegarLoop]: Abstraction has 1237 states and 1366 transitions. [2021-11-02 22:43:04,304 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 53 states have (on average 2.452830188679245) internal successors, (130), 52 states have internal predecessors, (130), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:43:04,304 INFO L276 IsEmpty]: Start isEmpty. Operand 1237 states and 1366 transitions. [2021-11-02 22:43:04,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-11-02 22:43:04,307 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:43:04,307 INFO L513 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:43:04,343 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Ended with exit code 0 [2021-11-02 22:43:04,519 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable75,58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:43:04,520 INFO L402 AbstractCegarLoop]: === Iteration 77 === Targeting cstrcatErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:43:04,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:43:04,520 INFO L85 PathProgramCache]: Analyzing trace with hash -1207206398, now seen corresponding path program 12 times [2021-11-02 22:43:04,520 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:43:04,520 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [845139385] [2021-11-02 22:43:04,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:43:04,520 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:43:04,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:43:05,947 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:43:05,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:43:05,959 INFO L134 CoverageAnalysis]: Checked inductivity of 183 backedges. 27 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:43:05,959 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:43:05,959 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [845139385] [2021-11-02 22:43:05,959 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [845139385] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:43:05,960 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1428815054] [2021-11-02 22:43:05,960 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-02 22:43:05,960 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:43:05,960 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:43:05,977 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:43:06,007 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Waiting until timeout for monitored process [2021-11-02 22:43:09,670 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-11-02 22:43:09,670 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:43:09,675 INFO L263 TraceCheckSpWp]: Trace formula consists of 421 conjuncts, 115 conjunts are in the unsatisfiable core [2021-11-02 22:43:09,677 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:43:09,708 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-02 22:43:10,978 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-02 22:43:11,051 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 35 [2021-11-02 22:43:11,615 INFO L354 Elim1Store]: treesize reduction 18, result has 50.0 percent of original size [2021-11-02 22:43:11,615 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 43 treesize of output 53 [2021-11-02 22:43:11,739 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 20 [2021-11-02 22:43:11,821 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 20 [2021-11-02 22:43:11,908 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 20 [2021-11-02 22:43:11,995 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 18 [2021-11-02 22:43:12,056 INFO L388 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 [2021-11-02 22:43:12,066 INFO L134 CoverageAnalysis]: Checked inductivity of 183 backedges. 40 proven. 143 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:43:12,066 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1428815054] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:43:12,066 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:43:12,066 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 33] total 62 [2021-11-02 22:43:12,066 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [799968366] [2021-11-02 22:43:12,067 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2021-11-02 22:43:12,067 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:43:12,067 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2021-11-02 22:43:12,068 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=224, Invalid=3558, Unknown=0, NotChecked=0, Total=3782 [2021-11-02 22:43:12,068 INFO L87 Difference]: Start difference. First operand 1237 states and 1366 transitions. Second operand has 62 states, 61 states have (on average 2.557377049180328) internal successors, (156), 59 states have internal predecessors, (156), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:43:16,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:43:16,164 INFO L93 Difference]: Finished difference Result 1309 states and 1436 transitions. [2021-11-02 22:43:16,164 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-02 22:43:16,164 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 61 states have (on average 2.557377049180328) internal successors, (156), 59 states have internal predecessors, (156), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 89 [2021-11-02 22:43:16,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:43:16,166 INFO L225 Difference]: With dead ends: 1309 [2021-11-02 22:43:16,166 INFO L226 Difference]: Without dead ends: 1255 [2021-11-02 22:43:16,167 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 66 SyntacticMatches, 2 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2322 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=816, Invalid=9084, Unknown=0, NotChecked=0, Total=9900 [2021-11-02 22:43:16,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1255 states. [2021-11-02 22:43:16,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1255 to 1235. [2021-11-02 22:43:16,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1235 states, 1200 states have (on average 1.1075) internal successors, (1329), 1202 states have internal predecessors, (1329), 31 states have call successors, (31), 31 states have call predecessors, (31), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:43:16,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1235 states to 1235 states and 1361 transitions. [2021-11-02 22:43:16,179 INFO L78 Accepts]: Start accepts. Automaton has 1235 states and 1361 transitions. Word has length 89 [2021-11-02 22:43:16,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:43:16,179 INFO L470 AbstractCegarLoop]: Abstraction has 1235 states and 1361 transitions. [2021-11-02 22:43:16,179 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 62 states, 61 states have (on average 2.557377049180328) internal successors, (156), 59 states have internal predecessors, (156), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:43:16,179 INFO L276 IsEmpty]: Start isEmpty. Operand 1235 states and 1361 transitions. [2021-11-02 22:43:16,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2021-11-02 22:43:16,181 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:43:16,181 INFO L513 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:43:16,215 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Ended with exit code 0 [2021-11-02 22:43:16,382 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable76,59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:43:16,382 INFO L402 AbstractCegarLoop]: === Iteration 78 === Targeting cstrcatErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:43:16,382 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:43:16,382 INFO L85 PathProgramCache]: Analyzing trace with hash -1945203588, now seen corresponding path program 21 times [2021-11-02 22:43:16,382 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:43:16,382 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [759542065] [2021-11-02 22:43:16,382 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:43:16,383 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:43:16,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:43:17,025 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:43:17,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:43:17,028 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 190 proven. 230 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:43:17,028 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:43:17,028 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [759542065] [2021-11-02 22:43:17,028 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [759542065] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:43:17,028 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1743430774] [2021-11-02 22:43:17,028 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-02 22:43:17,028 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:43:17,029 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:43:17,029 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:43:17,030 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Waiting until timeout for monitored process [2021-11-02 22:43:20,410 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2021-11-02 22:43:20,410 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:43:20,414 INFO L263 TraceCheckSpWp]: Trace formula consists of 372 conjuncts, 66 conjunts are in the unsatisfiable core [2021-11-02 22:43:20,415 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:43:20,445 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:43:20,445 INFO L388 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-02 22:43:21,871 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 231 proven. 189 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:43:21,871 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1743430774] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:43:21,871 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:43:21,871 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30] total 60 [2021-11-02 22:43:21,872 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1656078381] [2021-11-02 22:43:21,872 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2021-11-02 22:43:21,872 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:43:21,872 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2021-11-02 22:43:21,873 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=441, Invalid=3219, Unknown=0, NotChecked=0, Total=3660 [2021-11-02 22:43:21,873 INFO L87 Difference]: Start difference. First operand 1235 states and 1361 transitions. Second operand has 61 states, 60 states have (on average 2.783333333333333) internal successors, (167), 58 states have internal predecessors, (167), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:43:24,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:43:24,192 INFO L93 Difference]: Finished difference Result 1656 states and 1808 transitions. [2021-11-02 22:43:24,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-02 22:43:24,192 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 60 states have (on average 2.783333333333333) internal successors, (167), 58 states have internal predecessors, (167), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 90 [2021-11-02 22:43:24,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:43:24,194 INFO L225 Difference]: With dead ends: 1656 [2021-11-02 22:43:24,194 INFO L226 Difference]: Without dead ends: 1656 [2021-11-02 22:43:24,195 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1692 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=669, Invalid=5031, Unknown=0, NotChecked=0, Total=5700 [2021-11-02 22:43:24,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1656 states. [2021-11-02 22:43:24,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1656 to 1247. [2021-11-02 22:43:24,207 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1247 states, 1212 states have (on average 1.1105610561056105) internal successors, (1346), 1214 states have internal predecessors, (1346), 31 states have call successors, (31), 31 states have call predecessors, (31), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:43:24,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1247 states to 1247 states and 1378 transitions. [2021-11-02 22:43:24,209 INFO L78 Accepts]: Start accepts. Automaton has 1247 states and 1378 transitions. Word has length 90 [2021-11-02 22:43:24,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:43:24,209 INFO L470 AbstractCegarLoop]: Abstraction has 1247 states and 1378 transitions. [2021-11-02 22:43:24,210 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 60 states have (on average 2.783333333333333) internal successors, (167), 58 states have internal predecessors, (167), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:43:24,210 INFO L276 IsEmpty]: Start isEmpty. Operand 1247 states and 1378 transitions. [2021-11-02 22:43:24,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2021-11-02 22:43:24,211 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:43:24,211 INFO L513 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 8, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:43:24,243 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Forceful destruction successful, exit code 0 [2021-11-02 22:43:24,412 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable77,60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:43:24,412 INFO L402 AbstractCegarLoop]: === Iteration 79 === Targeting cstrcatErr5REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:43:24,412 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:43:24,412 INFO L85 PathProgramCache]: Analyzing trace with hash -1291907761, now seen corresponding path program 17 times [2021-11-02 22:43:24,412 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:43:24,413 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1281287369] [2021-11-02 22:43:24,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:43:24,413 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:43:24,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:43:26,539 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:43:26,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:43:26,543 INFO L134 CoverageAnalysis]: Checked inductivity of 241 backedges. 48 proven. 181 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-02 22:43:26,543 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:43:26,543 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1281287369] [2021-11-02 22:43:26,543 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1281287369] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:43:26,543 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1272035316] [2021-11-02 22:43:26,544 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-02 22:43:26,544 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:43:26,544 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:43:26,545 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:43:26,546 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Waiting until timeout for monitored process [2021-11-02 22:43:30,057 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2021-11-02 22:43:30,058 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:43:30,062 INFO L263 TraceCheckSpWp]: Trace formula consists of 401 conjuncts, 93 conjunts are in the unsatisfiable core [2021-11-02 22:43:30,063 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:43:31,371 INFO L388 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 21 treesize of output 17 [2021-11-02 22:43:33,372 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:43:33,372 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:43:33,373 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:43:33,374 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:43:33,374 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:43:33,375 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:43:33,376 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:43:33,376 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:43:33,377 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:43:33,380 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:43:33,381 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:43:33,381 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:43:33,382 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:43:33,383 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:43:33,383 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:43:33,384 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:43:33,385 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:43:33,385 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:43:33,386 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:43:33,387 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:43:33,387 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:43:33,422 INFO L354 Elim1Store]: treesize reduction 45, result has 50.0 percent of original size [2021-11-02 22:43:33,422 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 21 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 92 treesize of output 89 [2021-11-02 22:43:33,515 INFO L134 CoverageAnalysis]: Checked inductivity of 241 backedges. 29 proven. 200 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-02 22:43:33,515 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1272035316] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:43:33,515 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:43:33,515 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 33] total 67 [2021-11-02 22:43:33,515 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1408788429] [2021-11-02 22:43:33,516 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2021-11-02 22:43:33,516 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:43:33,516 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2021-11-02 22:43:33,517 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=290, Invalid=4132, Unknown=0, NotChecked=0, Total=4422 [2021-11-02 22:43:33,517 INFO L87 Difference]: Start difference. First operand 1247 states and 1378 transitions. Second operand has 67 states, 65 states have (on average 2.230769230769231) internal successors, (145), 64 states have internal predecessors, (145), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:43:41,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:43:41,148 INFO L93 Difference]: Finished difference Result 1337 states and 1469 transitions. [2021-11-02 22:43:41,148 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2021-11-02 22:43:41,148 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 65 states have (on average 2.230769230769231) internal successors, (145), 64 states have internal predecessors, (145), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 90 [2021-11-02 22:43:41,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:43:41,150 INFO L225 Difference]: With dead ends: 1337 [2021-11-02 22:43:41,150 INFO L226 Difference]: Without dead ends: 1283 [2021-11-02 22:43:41,151 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 204 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 142 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6719 ImplicationChecksByTransitivity, 7.7s TimeCoverageRelationStatistics Valid=1290, Invalid=19302, Unknown=0, NotChecked=0, Total=20592 [2021-11-02 22:43:41,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1283 states. [2021-11-02 22:43:41,162 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1283 to 1231. [2021-11-02 22:43:41,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1231 states, 1199 states have (on average 1.1109257714762302) internal successors, (1332), 1201 states have internal predecessors, (1332), 28 states have call successors, (28), 28 states have call predecessors, (28), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:43:41,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1231 states to 1231 states and 1361 transitions. [2021-11-02 22:43:41,165 INFO L78 Accepts]: Start accepts. Automaton has 1231 states and 1361 transitions. Word has length 90 [2021-11-02 22:43:41,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:43:41,166 INFO L470 AbstractCegarLoop]: Abstraction has 1231 states and 1361 transitions. [2021-11-02 22:43:41,166 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 65 states have (on average 2.230769230769231) internal successors, (145), 64 states have internal predecessors, (145), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:43:41,166 INFO L276 IsEmpty]: Start isEmpty. Operand 1231 states and 1361 transitions. [2021-11-02 22:43:41,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2021-11-02 22:43:41,168 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:43:41,169 INFO L513 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:43:41,228 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Forceful destruction successful, exit code 0 [2021-11-02 22:43:41,384 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable78,61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:43:41,384 INFO L402 AbstractCegarLoop]: === Iteration 80 === Targeting cstrcatErr5REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:43:41,384 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:43:41,384 INFO L85 PathProgramCache]: Analyzing trace with hash -1235413413, now seen corresponding path program 18 times [2021-11-02 22:43:41,385 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:43:41,385 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [714170589] [2021-11-02 22:43:41,385 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:43:41,385 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:43:41,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:43:42,373 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:43:42,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:43:42,375 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 12 proven. 125 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-11-02 22:43:42,376 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:43:42,376 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [714170589] [2021-11-02 22:43:42,376 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [714170589] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:43:42,376 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1157478091] [2021-11-02 22:43:42,376 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2021-11-02 22:43:42,376 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:43:42,376 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:43:42,377 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:43:42,377 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Waiting until timeout for monitored process [2021-11-02 22:43:46,382 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 8 check-sat command(s) [2021-11-02 22:43:46,382 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:43:46,387 INFO L263 TraceCheckSpWp]: Trace formula consists of 413 conjuncts, 57 conjunts are in the unsatisfiable core [2021-11-02 22:43:46,389 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:43:47,397 INFO L388 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 21 treesize of output 17 [2021-11-02 22:43:47,693 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-02 22:43:47,693 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 31 treesize of output 15 [2021-11-02 22:43:47,736 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 27 proven. 110 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-11-02 22:43:47,736 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1157478091] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:43:47,736 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:43:47,736 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25] total 45 [2021-11-02 22:43:47,736 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2077534086] [2021-11-02 22:43:47,737 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-11-02 22:43:47,737 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:43:47,738 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-11-02 22:43:47,738 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=197, Invalid=1783, Unknown=0, NotChecked=0, Total=1980 [2021-11-02 22:43:47,738 INFO L87 Difference]: Start difference. First operand 1231 states and 1361 transitions. Second operand has 45 states, 43 states have (on average 2.953488372093023) internal successors, (127), 43 states have internal predecessors, (127), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:43:50,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:43:50,065 INFO L93 Difference]: Finished difference Result 1232 states and 1357 transitions. [2021-11-02 22:43:50,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-02 22:43:50,066 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 43 states have (on average 2.953488372093023) internal successors, (127), 43 states have internal predecessors, (127), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 90 [2021-11-02 22:43:50,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:43:50,067 INFO L225 Difference]: With dead ends: 1232 [2021-11-02 22:43:50,067 INFO L226 Difference]: Without dead ends: 1222 [2021-11-02 22:43:50,068 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 71 SyntacticMatches, 2 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1400 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=656, Invalid=4894, Unknown=0, NotChecked=0, Total=5550 [2021-11-02 22:43:50,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1222 states. [2021-11-02 22:43:50,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1222 to 1213. [2021-11-02 22:43:50,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1213 states, 1182 states have (on average 1.1082910321489001) internal successors, (1310), 1184 states have internal predecessors, (1310), 27 states have call successors, (27), 27 states have call predecessors, (27), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:43:50,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1213 states to 1213 states and 1338 transitions. [2021-11-02 22:43:50,077 INFO L78 Accepts]: Start accepts. Automaton has 1213 states and 1338 transitions. Word has length 90 [2021-11-02 22:43:50,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:43:50,077 INFO L470 AbstractCegarLoop]: Abstraction has 1213 states and 1338 transitions. [2021-11-02 22:43:50,077 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 43 states have (on average 2.953488372093023) internal successors, (127), 43 states have internal predecessors, (127), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:43:50,078 INFO L276 IsEmpty]: Start isEmpty. Operand 1213 states and 1338 transitions. [2021-11-02 22:43:50,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2021-11-02 22:43:50,079 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:43:50,079 INFO L513 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:43:50,112 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Ended with exit code 0 [2021-11-02 22:43:50,281 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable79,62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:43:50,281 INFO L402 AbstractCegarLoop]: === Iteration 81 === Targeting cstrcatErr5REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:43:50,281 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:43:50,281 INFO L85 PathProgramCache]: Analyzing trace with hash 1537936993, now seen corresponding path program 19 times [2021-11-02 22:43:50,281 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:43:50,281 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1244053201] [2021-11-02 22:43:50,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:43:50,282 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:43:50,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:43:50,957 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:43:50,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:43:50,960 INFO L134 CoverageAnalysis]: Checked inductivity of 172 backedges. 19 proven. 96 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-11-02 22:43:50,961 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:43:50,961 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1244053201] [2021-11-02 22:43:50,961 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1244053201] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:43:50,961 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [157498659] [2021-11-02 22:43:50,961 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-02 22:43:50,961 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:43:50,961 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:43:50,965 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:43:50,983 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Waiting until timeout for monitored process [2021-11-02 22:43:54,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:43:54,491 INFO L263 TraceCheckSpWp]: Trace formula consists of 419 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-02 22:43:54,493 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:43:55,432 INFO L388 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 21 treesize of output 17 [2021-11-02 22:43:55,592 INFO L354 Elim1Store]: treesize reduction 8, result has 27.3 percent of original size [2021-11-02 22:43:55,592 INFO L388 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 33 treesize of output 25 [2021-11-02 22:43:55,643 INFO L134 CoverageAnalysis]: Checked inductivity of 172 backedges. 32 proven. 83 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-11-02 22:43:55,643 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [157498659] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:43:55,643 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:43:55,643 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 39 [2021-11-02 22:43:55,643 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2038851861] [2021-11-02 22:43:55,643 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-02 22:43:55,644 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:43:55,644 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-02 22:43:55,644 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=182, Invalid=1300, Unknown=0, NotChecked=0, Total=1482 [2021-11-02 22:43:55,645 INFO L87 Difference]: Start difference. First operand 1213 states and 1338 transitions. Second operand has 39 states, 37 states have (on average 3.2432432432432434) internal successors, (120), 36 states have internal predecessors, (120), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:43:56,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:43:56,919 INFO L93 Difference]: Finished difference Result 1205 states and 1329 transitions. [2021-11-02 22:43:56,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-02 22:43:56,919 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 37 states have (on average 3.2432432432432434) internal successors, (120), 36 states have internal predecessors, (120), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 90 [2021-11-02 22:43:56,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:43:56,920 INFO L225 Difference]: With dead ends: 1205 [2021-11-02 22:43:56,920 INFO L226 Difference]: Without dead ends: 1199 [2021-11-02 22:43:56,921 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 742 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=545, Invalid=2761, Unknown=0, NotChecked=0, Total=3306 [2021-11-02 22:43:56,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1199 states. [2021-11-02 22:43:56,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1199 to 1199. [2021-11-02 22:43:56,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1199 states, 1169 states have (on average 1.1086398631308811) internal successors, (1296), 1171 states have internal predecessors, (1296), 26 states have call successors, (26), 26 states have call predecessors, (26), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:43:56,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1199 states to 1199 states and 1323 transitions. [2021-11-02 22:43:56,930 INFO L78 Accepts]: Start accepts. Automaton has 1199 states and 1323 transitions. Word has length 90 [2021-11-02 22:43:56,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:43:56,930 INFO L470 AbstractCegarLoop]: Abstraction has 1199 states and 1323 transitions. [2021-11-02 22:43:56,930 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 37 states have (on average 3.2432432432432434) internal successors, (120), 36 states have internal predecessors, (120), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:43:56,930 INFO L276 IsEmpty]: Start isEmpty. Operand 1199 states and 1323 transitions. [2021-11-02 22:43:56,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2021-11-02 22:43:56,932 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:43:56,933 INFO L513 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:43:56,964 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Forceful destruction successful, exit code 0 [2021-11-02 22:43:57,133 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable80,63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:43:57,133 INFO L402 AbstractCegarLoop]: === Iteration 82 === Targeting cstrcatErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:43:57,133 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:43:57,133 INFO L85 PathProgramCache]: Analyzing trace with hash -1029873291, now seen corresponding path program 22 times [2021-11-02 22:43:57,134 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:43:57,134 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1519329677] [2021-11-02 22:43:57,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:43:57,134 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:43:57,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:44:00,195 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:44:00,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:44:00,198 INFO L134 CoverageAnalysis]: Checked inductivity of 445 backedges. 126 proven. 318 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:44:00,198 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:44:00,199 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1519329677] [2021-11-02 22:44:00,199 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1519329677] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:44:00,199 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1895790518] [2021-11-02 22:44:00,199 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-02 22:44:00,199 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:44:00,199 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:44:00,200 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:44:00,201 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Waiting until timeout for monitored process [2021-11-02 22:44:03,788 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-02 22:44:03,788 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:44:03,791 INFO L263 TraceCheckSpWp]: Trace formula consists of 335 conjuncts, 118 conjunts are in the unsatisfiable core [2021-11-02 22:44:03,792 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:44:03,843 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:44:03,844 INFO L388 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 1 case distinctions, treesize of input 18 treesize of output 23 [2021-11-02 22:44:05,501 INFO L388 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 24 treesize of output 20 [2021-11-02 22:44:09,113 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,114 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,115 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,115 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,116 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,117 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,117 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,118 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,119 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,119 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,120 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,120 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,121 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,122 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,122 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,123 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,124 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,124 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,125 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,126 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,126 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,127 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,127 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,128 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,129 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,129 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,130 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,131 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,131 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,132 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,133 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,133 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,134 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,135 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,135 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,136 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,137 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,137 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,138 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,139 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,140 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,140 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,141 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,141 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,142 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,143 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,143 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,144 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,144 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,145 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,146 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,146 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,147 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,148 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,148 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,149 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,150 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,150 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,151 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,151 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,152 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,153 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,153 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,154 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,154 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,155 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:09,221 INFO L354 Elim1Store]: treesize reduction 68, result has 52.4 percent of original size [2021-11-02 22:44:09,221 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 13 select indices, 13 select index equivalence classes, 66 disjoint index pairs (out of 78 index pairs), introduced 13 new quantified variables, introduced 12 case distinctions, treesize of input 137 treesize of output 135 [2021-11-02 22:44:10,850 INFO L134 CoverageAnalysis]: Checked inductivity of 445 backedges. 146 proven. 299 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:44:10,850 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1895790518] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:44:10,850 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:44:10,851 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46] total 88 [2021-11-02 22:44:10,851 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [564291286] [2021-11-02 22:44:10,851 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 88 states [2021-11-02 22:44:10,851 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:44:10,852 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 88 interpolants. [2021-11-02 22:44:10,852 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=616, Invalid=7040, Unknown=0, NotChecked=0, Total=7656 [2021-11-02 22:44:10,852 INFO L87 Difference]: Start difference. First operand 1199 states and 1323 transitions. Second operand has 88 states, 86 states have (on average 1.9651162790697674) internal successors, (169), 85 states have internal predecessors, (169), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:44:20,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:44:20,341 INFO L93 Difference]: Finished difference Result 1573 states and 1733 transitions. [2021-11-02 22:44:20,341 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2021-11-02 22:44:20,341 INFO L78 Accepts]: Start accepts. Automaton has has 88 states, 86 states have (on average 1.9651162790697674) internal successors, (169), 85 states have internal predecessors, (169), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 92 [2021-11-02 22:44:20,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:44:20,344 INFO L225 Difference]: With dead ends: 1573 [2021-11-02 22:44:20,344 INFO L226 Difference]: Without dead ends: 1545 [2021-11-02 22:44:20,346 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 154 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7728 ImplicationChecksByTransitivity, 12.1s TimeCoverageRelationStatistics Valid=2286, Invalid=21894, Unknown=0, NotChecked=0, Total=24180 [2021-11-02 22:44:20,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1545 states. [2021-11-02 22:44:20,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1545 to 1353. [2021-11-02 22:44:20,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1353 states, 1318 states have (on average 1.1160849772382397) internal successors, (1471), 1320 states have internal predecessors, (1471), 31 states have call successors, (31), 31 states have call predecessors, (31), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:44:20,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1353 states to 1353 states and 1503 transitions. [2021-11-02 22:44:20,363 INFO L78 Accepts]: Start accepts. Automaton has 1353 states and 1503 transitions. Word has length 92 [2021-11-02 22:44:20,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:44:20,364 INFO L470 AbstractCegarLoop]: Abstraction has 1353 states and 1503 transitions. [2021-11-02 22:44:20,364 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 88 states, 86 states have (on average 1.9651162790697674) internal successors, (169), 85 states have internal predecessors, (169), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:44:20,364 INFO L276 IsEmpty]: Start isEmpty. Operand 1353 states and 1503 transitions. [2021-11-02 22:44:20,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-11-02 22:44:20,367 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:44:20,367 INFO L513 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 6, 6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:44:20,419 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Ended with exit code 0 [2021-11-02 22:44:20,589 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable81,64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:44:20,589 INFO L402 AbstractCegarLoop]: === Iteration 83 === Targeting cstrcatErr3REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:44:20,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:44:20,589 INFO L85 PathProgramCache]: Analyzing trace with hash 1364440095, now seen corresponding path program 13 times [2021-11-02 22:44:20,589 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:44:20,590 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [858428307] [2021-11-02 22:44:20,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:44:20,590 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:44:20,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:44:21,841 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:44:21,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:44:21,844 INFO L134 CoverageAnalysis]: Checked inductivity of 208 backedges. 12 proven. 195 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:44:21,844 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:44:21,844 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [858428307] [2021-11-02 22:44:21,845 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [858428307] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:44:21,845 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2082309430] [2021-11-02 22:44:21,845 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-02 22:44:21,845 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:44:21,845 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:44:21,847 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:44:21,848 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Waiting until timeout for monitored process [2021-11-02 22:44:25,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:44:25,616 INFO L263 TraceCheckSpWp]: Trace formula consists of 432 conjuncts, 111 conjunts are in the unsatisfiable core [2021-11-02 22:44:25,618 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:44:25,641 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-02 22:44:26,442 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-02 22:44:26,510 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 30 [2021-11-02 22:44:26,895 INFO L354 Elim1Store]: treesize reduction 18, result has 50.0 percent of original size [2021-11-02 22:44:26,895 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 47 [2021-11-02 22:44:27,072 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 26 [2021-11-02 22:44:27,250 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 26 [2021-11-02 22:44:27,429 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 26 [2021-11-02 22:44:27,606 INFO L354 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2021-11-02 22:44:27,606 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 31 treesize of output 30 [2021-11-02 22:44:27,753 INFO L354 Elim1Store]: treesize reduction 7, result has 30.0 percent of original size [2021-11-02 22:44:27,753 INFO L388 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 23 treesize of output 16 [2021-11-02 22:44:27,762 INFO L134 CoverageAnalysis]: Checked inductivity of 208 backedges. 12 proven. 105 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-11-02 22:44:27,762 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2082309430] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:44:27,762 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:44:27,763 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 26] total 60 [2021-11-02 22:44:27,763 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [394527484] [2021-11-02 22:44:27,763 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2021-11-02 22:44:27,763 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:44:27,763 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-11-02 22:44:27,764 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=3365, Unknown=0, NotChecked=0, Total=3540 [2021-11-02 22:44:27,764 INFO L87 Difference]: Start difference. First operand 1353 states and 1503 transitions. Second operand has 60 states, 59 states have (on average 2.457627118644068) internal successors, (145), 57 states have internal predecessors, (145), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:44:31,122 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:44:31,123 INFO L93 Difference]: Finished difference Result 1863 states and 2077 transitions. [2021-11-02 22:44:31,123 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-02 22:44:31,123 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 59 states have (on average 2.457627118644068) internal successors, (145), 57 states have internal predecessors, (145), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 93 [2021-11-02 22:44:31,123 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:44:31,125 INFO L225 Difference]: With dead ends: 1863 [2021-11-02 22:44:31,125 INFO L226 Difference]: Without dead ends: 1643 [2021-11-02 22:44:31,126 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 72 SyntacticMatches, 2 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1665 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=364, Invalid=6776, Unknown=0, NotChecked=0, Total=7140 [2021-11-02 22:44:31,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1643 states. [2021-11-02 22:44:31,136 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1643 to 1579. [2021-11-02 22:44:31,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1579 states, 1538 states have (on average 1.1196358907672301) internal successors, (1722), 1540 states have internal predecessors, (1722), 37 states have call successors, (37), 37 states have call predecessors, (37), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:44:31,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1579 states to 1579 states and 1760 transitions. [2021-11-02 22:44:31,139 INFO L78 Accepts]: Start accepts. Automaton has 1579 states and 1760 transitions. Word has length 93 [2021-11-02 22:44:31,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:44:31,140 INFO L470 AbstractCegarLoop]: Abstraction has 1579 states and 1760 transitions. [2021-11-02 22:44:31,140 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 59 states have (on average 2.457627118644068) internal successors, (145), 57 states have internal predecessors, (145), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:44:31,140 INFO L276 IsEmpty]: Start isEmpty. Operand 1579 states and 1760 transitions. [2021-11-02 22:44:31,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-02 22:44:31,143 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:44:31,143 INFO L513 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 10, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:44:31,180 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Ended with exit code 0 [2021-11-02 22:44:31,357 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable82,65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:44:31,357 INFO L402 AbstractCegarLoop]: === Iteration 84 === Targeting cstrcatErr5REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:44:31,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:44:31,357 INFO L85 PathProgramCache]: Analyzing trace with hash -21251380, now seen corresponding path program 20 times [2021-11-02 22:44:31,357 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:44:31,357 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [181217324] [2021-11-02 22:44:31,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:44:31,358 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:44:31,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:44:31,922 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:44:31,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:44:31,925 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 153 proven. 191 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:44:31,925 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:44:31,925 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [181217324] [2021-11-02 22:44:31,925 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [181217324] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:44:31,925 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [312561462] [2021-11-02 22:44:31,925 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-02 22:44:31,926 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:44:31,926 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:44:31,926 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:44:31,927 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Waiting until timeout for monitored process [2021-11-02 22:44:35,792 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-02 22:44:35,792 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:44:35,795 INFO L263 TraceCheckSpWp]: Trace formula consists of 406 conjuncts, 80 conjunts are in the unsatisfiable core [2021-11-02 22:44:35,796 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:44:35,845 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:44:35,845 INFO L388 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-02 22:44:37,188 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 190 proven. 154 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-02 22:44:37,188 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [312561462] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:44:37,188 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:44:37,188 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29] total 57 [2021-11-02 22:44:37,188 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [368431505] [2021-11-02 22:44:37,188 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2021-11-02 22:44:37,188 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:44:37,189 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-11-02 22:44:37,189 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=332, Invalid=2974, Unknown=0, NotChecked=0, Total=3306 [2021-11-02 22:44:37,190 INFO L87 Difference]: Start difference. First operand 1579 states and 1760 transitions. Second operand has 58 states, 57 states have (on average 3.0701754385964914) internal successors, (175), 55 states have internal predecessors, (175), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:44:38,973 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:44:38,973 INFO L93 Difference]: Finished difference Result 1991 states and 2178 transitions. [2021-11-02 22:44:38,973 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-02 22:44:38,973 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 57 states have (on average 3.0701754385964914) internal successors, (175), 55 states have internal predecessors, (175), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 94 [2021-11-02 22:44:38,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:44:38,975 INFO L225 Difference]: With dead ends: 1991 [2021-11-02 22:44:38,975 INFO L226 Difference]: Without dead ends: 1942 [2021-11-02 22:44:38,976 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 67 SyntacticMatches, 1 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1757 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=469, Invalid=4787, Unknown=0, NotChecked=0, Total=5256 [2021-11-02 22:44:38,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1942 states. [2021-11-02 22:44:38,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1942 to 1501. [2021-11-02 22:44:38,994 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1501 states, 1460 states have (on average 1.106849315068493) internal successors, (1616), 1462 states have internal predecessors, (1616), 37 states have call successors, (37), 37 states have call predecessors, (37), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:44:38,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1501 states to 1501 states and 1654 transitions. [2021-11-02 22:44:38,997 INFO L78 Accepts]: Start accepts. Automaton has 1501 states and 1654 transitions. Word has length 94 [2021-11-02 22:44:38,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:44:38,998 INFO L470 AbstractCegarLoop]: Abstraction has 1501 states and 1654 transitions. [2021-11-02 22:44:38,998 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 57 states have (on average 3.0701754385964914) internal successors, (175), 55 states have internal predecessors, (175), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:44:38,998 INFO L276 IsEmpty]: Start isEmpty. Operand 1501 states and 1654 transitions. [2021-11-02 22:44:39,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-11-02 22:44:39,001 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:44:39,001 INFO L513 BasicCegarLoop]: trace histogram [13, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:44:39,056 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Forceful destruction successful, exit code 0 [2021-11-02 22:44:39,229 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable83 [2021-11-02 22:44:39,229 INFO L402 AbstractCegarLoop]: === Iteration 85 === Targeting cstrcatErr1REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:44:39,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:44:39,229 INFO L85 PathProgramCache]: Analyzing trace with hash 1784461880, now seen corresponding path program 23 times [2021-11-02 22:44:39,229 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:44:39,230 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [835458623] [2021-11-02 22:44:39,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:44:39,230 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:44:39,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:44:39,924 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:44:39,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:44:39,931 INFO L134 CoverageAnalysis]: Checked inductivity of 494 backedges. 231 proven. 263 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:44:39,931 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:44:39,932 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [835458623] [2021-11-02 22:44:39,932 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [835458623] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:44:39,932 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [976557345] [2021-11-02 22:44:39,932 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2021-11-02 22:44:39,932 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:44:39,932 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:44:39,934 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:44:39,939 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Waiting until timeout for monitored process [2021-11-02 22:44:44,030 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 14 check-sat command(s) [2021-11-02 22:44:44,030 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:44:44,034 INFO L263 TraceCheckSpWp]: Trace formula consists of 394 conjuncts, 86 conjunts are in the unsatisfiable core [2021-11-02 22:44:44,035 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:44:44,065 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:44:44,066 INFO L388 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-02 22:44:45,079 INFO L134 CoverageAnalysis]: Checked inductivity of 494 backedges. 276 proven. 218 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-02 22:44:45,080 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [976557345] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:44:45,080 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:44:45,080 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 31] total 47 [2021-11-02 22:44:45,080 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2014998412] [2021-11-02 22:44:45,080 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-02 22:44:45,080 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:44:45,080 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-02 22:44:45,081 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=201, Invalid=2055, Unknown=0, NotChecked=0, Total=2256 [2021-11-02 22:44:45,081 INFO L87 Difference]: Start difference. First operand 1501 states and 1654 transitions. Second operand has 48 states, 47 states have (on average 2.74468085106383) internal successors, (129), 46 states have internal predecessors, (129), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:44:47,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-02 22:44:47,086 INFO L93 Difference]: Finished difference Result 1988 states and 2171 transitions. [2021-11-02 22:44:47,086 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-11-02 22:44:47,086 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 47 states have (on average 2.74468085106383) internal successors, (129), 46 states have internal predecessors, (129), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 96 [2021-11-02 22:44:47,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-02 22:44:47,088 INFO L225 Difference]: With dead ends: 1988 [2021-11-02 22:44:47,088 INFO L226 Difference]: Without dead ends: 1988 [2021-11-02 22:44:47,089 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 82 SyntacticMatches, 1 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1129 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=320, Invalid=3712, Unknown=0, NotChecked=0, Total=4032 [2021-11-02 22:44:47,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1988 states. [2021-11-02 22:44:47,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1988 to 1515. [2021-11-02 22:44:47,102 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1515 states, 1474 states have (on average 1.1099050203527816) internal successors, (1636), 1476 states have internal predecessors, (1636), 37 states have call successors, (37), 37 states have call predecessors, (37), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:44:47,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1515 states to 1515 states and 1674 transitions. [2021-11-02 22:44:47,104 INFO L78 Accepts]: Start accepts. Automaton has 1515 states and 1674 transitions. Word has length 96 [2021-11-02 22:44:47,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-02 22:44:47,104 INFO L470 AbstractCegarLoop]: Abstraction has 1515 states and 1674 transitions. [2021-11-02 22:44:47,105 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 47 states have (on average 2.74468085106383) internal successors, (129), 46 states have internal predecessors, (129), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-02 22:44:47,105 INFO L276 IsEmpty]: Start isEmpty. Operand 1515 states and 1674 transitions. [2021-11-02 22:44:47,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-11-02 22:44:47,107 INFO L505 BasicCegarLoop]: Found error trace [2021-11-02 22:44:47,108 INFO L513 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 9, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-02 22:44:47,144 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Ended with exit code 0 [2021-11-02 22:44:47,321 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable84,67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:44:47,321 INFO L402 AbstractCegarLoop]: === Iteration 86 === Targeting cstrcatErr5REQUIRES_VIOLATION === [mainErr0REQUIRES_VIOLATION, mainErr1REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION, mainErr4REQUIRES_VIOLATION (and 10 more)] === [2021-11-02 22:44:47,321 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-02 22:44:47,321 INFO L85 PathProgramCache]: Analyzing trace with hash -277396277, now seen corresponding path program 21 times [2021-11-02 22:44:47,321 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-11-02 22:44:47,321 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [935441201] [2021-11-02 22:44:47,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-02 22:44:47,322 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-02 22:44:47,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:44:49,651 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-11-02 22:44:49,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-02 22:44:49,654 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 62 proven. 222 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-02 22:44:49,654 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-11-02 22:44:49,654 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [935441201] [2021-11-02 22:44:49,654 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [935441201] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:44:49,655 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1052962874] [2021-11-02 22:44:49,655 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-02 22:44:49,655 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-02 22:44:49,655 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 [2021-11-02 22:44:49,655 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-02 22:44:49,656 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f4d52a6c-8c71-432c-95ba-3f200e596dd1/bin/uautomizer-tBqnrhUYjU/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Waiting until timeout for monitored process [2021-11-02 22:44:53,951 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-11-02 22:44:53,952 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-02 22:44:53,956 INFO L263 TraceCheckSpWp]: Trace formula consists of 412 conjuncts, 125 conjunts are in the unsatisfiable core [2021-11-02 22:44:53,959 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-02 22:44:53,998 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-02 22:44:54,009 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-02 22:44:54,010 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-02 22:44:55,055 INFO L388 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 25 treesize of output 21 [2021-11-02 22:44:57,433 INFO L354 Elim1Store]: treesize reduction 78, result has 76.3 percent of original size [2021-11-02 22:44:57,433 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 9 select indices, 9 select index equivalence classes, 1 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 36 case distinctions, treesize of input 105 treesize of output 313 [2021-11-02 22:44:59,324 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 37 proven. 106 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2021-11-02 22:44:59,324 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1052962874] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-02 22:44:59,324 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-11-02 22:44:59,324 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 32] total 70 [2021-11-02 22:44:59,325 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [806555452] [2021-11-02 22:44:59,325 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 70 states [2021-11-02 22:44:59,325 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-11-02 22:44:59,325 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2021-11-02 22:44:59,326 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=4524, Unknown=0, NotChecked=0, Total=4830 [2021-11-02 22:44:59,326 INFO L87 Difference]: Start difference. First operand 1515 states and 1674 transitions. Second operand has 70 states, 68 states have (on average 2.0588235294117645) internal successors, (140), 67 states have internal predecessors, (140), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1)