JMS-C debugging issue

Question

Hi,
          I am using jmscapi for reading data from a JMS Queue.
          If I run the binary in dbx mode it stops in the JMSCreateContext() function call and displays this
          t@1 (l@1) signal SEGV (no mapping at the fault address) in (unknown) at 0xfa87fae0
          0xfa87fae0: bad opcode
          But if I run the same binary without dbx it works fine and it reads data from the JMS Queue successfully.
          Following is the stack trace with dbx mode:
          [SunOS]dbx ReadRequestQueue
          For information about new features see `help changes'
          To remove this message, put `dbxenv suppress_startup_message 7.1' in your .dbxrc
          Reading ReadRequestQueue
          Reading ld.so.1
          Reading libxerces-c.so.27
          Reading libjmsc.so
          Reading libjvm.so
          Reading librt.so.1
          Reading libCstd.so.1
          Reading libCrun.so.1
          Reading libm.so.1
          Reading libw.so.1
          Reading libc.so.1
          Reading libpthread.so.1
          Reading libnsl.so.1
          Reading libsocket.so.1
          Reading libdl.so.1
          Reading libthread.so.1
          Reading libaio.so.1
          Reading libmd5.so.1
          Reading libmp.so.2
          Reading libCstd_isa.so.1
          Reading libc_psr.so.1
          detected a multithreaded program
          (dbx) run
          Running: ReadRequestQueue
          (process id 27371)
          Reading libhpi.so
          Reading libverify.so
          Reading libjava.so
          Reading libzip.so
          t@1 (l@1) signal SEGV (no mapping at the fault address) in (unknown) at 0xfa87fae0
          0xfa87fae0: bad opcode
          Current function is main
          68 != JMS_NO_ERROR) {
          (dbx) where
          current thread: t@1
          [1] 0xfa87fae0(0xf25c6718, 0x1, 0xd, 0x34, 0xf65dcf70, 0xffbfcb50), at 0xfa87fadf
          [2] 0xfa805c64(0xf25c6568, 0xb7, 0xffbfccd8, 0xfa815238, 0xfa8150c4, 0xffbfcbf0), at 0xfa805c63
          [3] 0xfa805c64(0xf25c6568, 0xb6, 0xffbfcd60, 0xfa8151f0, 0xfa8150c4, 0xffbfcc70), at 0xfa805c63
          [4] 0xfa805b10(0xf25c6568, 0xb6, 0xffbfcde8, 0xfa815030, 0xfa8150c4, 0xffbfcd00), at 0xfa805b0f
          [5] 0xfa805b10(0xf25c6568, 0xb6, 0x8, 0xfa815030, 0xfa815284, 0xffbfcd80), at 0xfa805b0f
          [6] 0xfa805b10(0xf25c5540, 0xb7, 0x11, 0xfa815080, 0xfa815284, 0xffbfce18), at 0xfa805b0f
          [7] 0xfa805c64(0xf25c5540, 0xb7, 0xffbfcf74, 0xfa8151f0, 0xfa815284, 0xffbfce98), at 0xfa805c63
          [8] 0xfa805c64(0xf25c5540, 0xb7, 0xffbfcff8, 0xfa8151f0, 0xfa815284, 0xffbfcf18), at 0xfa805c63
          [9] 0xfa805c64(0xf25c5540, 0xb7, 0x3b, 0xfa815350, 0xf65c6180, 0xffbfcf98), at 0xfa805c63
          [10] 0xfa805c64(0x5a180, 0xb8, 0xffbfd118, 0xfa815240, 0xfa815284, 0xffbfd028), at 0xfa805c63
          [11] 0xfa805c64(0xf25c52a8, 0xb7, 0xffbfd198, 0xfa8153a0, 0xfa8150c4, 0xffbfd0b8), at 0xfa805c63
          [12] 0xfa805b54(0xf25c52a8, 0xb6, 0x23, 0xfa815238, 0xf65bb7a0, 0xffbfd138), at 0xfa805b53
          [13] 0xfa805b54(0xf25c4dd8, 0xb7, 0x8, 0xfa815080, 0xf65bb7a0, 0xffbfd1b8), at 0xfa805b53
          [14] 0xfa805c64(0xf25c4dd8, 0xb7, 0x34, 0xfa8151f0, 0xf65865c8, 0xffbfd240), at 0xfa805c63
          [15] 0xfa805c64(0xf25b2018, 0xb6, 0x8, 0xfa815240, 0xf65865c8, 0xffbfd2f0), at 0xfa805c63
          [16] 0xfa805c64(0xf25b2018, 0xb7, 0x78, 0xfa8154b0, 0xf6569f80, 0xffbfd380), at 0xfa805c63
          [17] 0xfa805c64(0x5a180, 0xb8, 0x8, 0xfa8151f0, 0xfa8153e4, 0xffbfd420), at 0xfa805c63
          [18] 0xfa805c64(0x5a180, 0xb8, 0x15, 0xfa815398, 0xf6569f80, 0xffbfd4c0), at 0xfa805c63
          [19] 0xfa805c64(0x5a180, 0xb8, 0x44, 0xfa815350, 0xf6562fd0, 0xffbfd558), at 0xfa805c63
          [20] 0xfa805c64(0x5a180, 0x0, 0x0, 0xfa8153a0, 0x361240, 0xffbfd5d8), at 0xfa805c63
          [21] 0xfa800118(0xffbfd6c4, 0xffbfd788, 0xa, 0xf6564b18, 0xfa80aae0, 0xffbfd794), at 0xfa800117
          [22] JavaCalls::call_helper(0xffbfd780, 0xffbfd77c, 0xffbfd790, 0x5a180, 0x5a180, 0x5c00), at 0xfe4d4b98
          [23] instanceKlass::call_class_initializer_impl(0xffbfd854, 0x5a180, 0xffbfd9ac, 0x5a180, 0x1, 0x0), at 0xfe4d4878
          [24] instanceKlass::call_class_initializer(0xf6564bc0, 0x5a180, 0x5a180, 0x5a180, 0xfe4dc7d4, 0xc), at 0xfe4d475c
          [25] instanceKlass::initialize_impl(0xffbfda10, 0x5a180, 0xffbfdc14, 0x10e5d8, 0x5a180, 0x1), at 0xfe4d42ac
          [26] instanceKlass::initialize(0xf6564bc0, 0x5a180, 0x5a180, 0xffbfd928, 0x2a, 0x13c), at 0xfe4d3d48
          [27] InterpreterRuntime::_new(0x5a180, 0xf6538b68, 0xb1, 0x2c4, 0xf6538b68, 0xffbfdab0), at 0xfe4dcd8c
          [28] 0xfa815854(0x5a180, 0x0, 0x0, 0xfa8104b0, 0x361240, 0xffbfdb48), at 0xfa815853
          [29] 0xfa800118(0xffbfdc34, 0xffbfdcf8, 0xa, 0xf653cab0, 0xfa80aae0, 0xffbfdd04), at 0xfa800117
          [30] JavaCalls::call_helper(0xffbfdcf0, 0xffbfdcec, 0xffbfdd00, 0x5a180, 0x5a180, 0x5c00), at 0xfe4d4b98
          [31] instanceKlass::call_class_initializer_impl(0xffbfddc4, 0x5a180, 0xffbfdf1c, 0x5a180, 0x59de0, 0x0), at 0xfe4d4878
          [32] instanceKlass::call_class_initializer(0xf653cc00, 0x5a180, 0x5a180, 0x5a180, 0x1, 0x0), at 0xfe4d475c
          [33] instanceKlass::initialize_impl(0xffbfdf80, 0x5a180, 0xffbfe604, 0x5a79c, 0x59870, 0x0), at 0xfe4d42ac
          [34] instanceKlass::initialize(0xf653cc00, 0x5a180, 0xffbfe00c, 0x0, 0x5a180, 0x0), at 0xfe4d3d48
          [35] find_class_from_class_loader(0x5a20c, 0xffbfe088, 0x1, 0xffbfe084, 0xffbfe078, 0x0), at 0xfe4e8b6c
          [36] JVM_FindClassFromClassLoader(0xfe828000, 0xffbfe100, 0x1, 0xffbfe25c, 0x0, 0x0), at 0xfe4f2780
          [37] Java_java_lang_Class_forName0(0x5a20c, 0xffbfe1e8, 0xffbfe264, 0x1, 0xffbfe25c, 0x0), at 0xfe87c1f8
          [38] 0xfa80bbc8(0xf26141e8, 0xb8, 0xffbfe2e4, 0xfa815030, 0xfa8153e4, 0xffbfe200), at 0xfa80bbc7
          [39] 0xfa805b10(0x5a180, 0xb8, 0x8, 0xfa815398, 0xf64089b8, 0xffbfe280), at 0xfa805b0f
          [40] 0xfa805b10(0xf2431840, 0xf6531a10, 0x8, 0xfa8153a0, 0xf6531a10, 0xffbfe310), at 0xfa805b0f
          [41] 0xfa805fd8(0x5a180, 0xb8, 0xffbfe494, 0xfa8154b0, 0xfa8150c4, 0xffbfe3b0), at 0xfa805fd7
          [42] 0xfa805b10(0xf26101a8, 0xb6, 0x8, 0xfa8153a0, 0xfa8150c4, 0xffbfe430), at 0xfa805b0f
          [43] 0xfa805b10(0xf24f9bf8, 0xb6, 0xffbfe590, 0xfa815030, 0xf6427128, 0xffbfe4b0), at 0xfa805b0f
          [44] 0xfa805c64(0xffbfe598, 0x0, 0x0, 0xfa815030, 0x361240, 0xffbfe530), at 0xfa805c63
          [45] 0xfa800118(0xffbfe624, 0xffbfe848, 0xa, 0xf6522130, 0xfa80aae0, 0xffbfe74c), at 0xfa800117
          [46] JavaCalls::call_helper(0xffbfe840, 0xffbfe6d8, 0xffbfe740, 0x5a180, 0x5a180, 0x5c00), at 0xfe4d4b98
          [47] jni_invoke_nonstatic(0x0, 0xfe83fdf8, 0x4000, 0x4380, 0x5a730, 0xffbfe824), at 0xfe4eb508
          [48] jni_NewObject(0x5a20c, 0x5abf4, 0xe5330, 0x5abf0, 0xff394e30, 0x20380d), at 0xfe5bd65c
          [49] JmsContextCreate(0xffbfeda4, 0x0, 0x0, 0x0, 0xffbfeda0, 0x0), at 0xff36e82c
          =>[50] main(argc = -228825368, argv = 0xf25c66e8), line 68 in "ReadRequestQueue.c"
          (dbx)
          Is there any way to skip over the JMSC function calls?
          Or can I get the source code of jmscapi so that I build it with -g option.
          Thank you in advance for your help.
          -Puja.

Answer 1

Hi Chirag,
In Background Job cases, I think BADI's can not be debugged directly by putting a break point. There is another way round using SM50. Please follow the below link. It may help you.
https://scn.sap.com/thread/1307038