Crash in glusterfs!!!

[ABHISHEK PALIWAL <abhishpaliwal@xxxxxxxxx>]

We have seen a SIGSEGV crash on glusterfs process on kernel restart at start up.

(gdb) bt 
#0  0x00003fffad4463b0 in _IO_unbuffer_all () at genops.c:960 
#1  _IO_cleanup () at genops.c:1020 
#2  0x00003fffad400d00 in __run_exit_handlers (status=<optimized out>, listp=<optimized out>, run_list_atexit=run_list_atexit@entry=true) at exit.c:95 
#3  0x00003fffad400e1c in __GI_exit (status=<optimized out>) at exit.c:104 
#4  0x000000001000984c in cleanup_and_exit (signum=<optimized out>) at glusterfsd.c:1295 
#5  0x0000000010009a64 in glusterfs_sigwaiter (arg=<optimized out>) at glusterfsd.c:2016 
#6  0x00003fffad57db30 in start_thread (arg=0x3fffab302160) at pthread_create.c:462 
#7  0x00003fffad4c7cdc in .__clone () at ../sysdeps/unix/sysv/linux/powerpc/powerpc64/clone.S:96 

(gdb) bt full 
#0  0x00003fffad4463b0 in _IO_unbuffer_all () at genops.c:960 
    __result = 0 
    __self = 0x3fffab302160 
    cnt = 1 
    fp = 0x3fffa4001f00 
#1  _IO_cleanup () at genops.c:1020 
    result = 0 
#2  0x00003fffad400d00 in __run_exit_handlers (status=<optimized out>, listp=<optimized out>, run_list_atexit=run_list_atexit@entry=true) at exit.c:95 
    ptr = 0x3fffad557000 <__elf_set___libc_atexit_element__IO_cleanup__> 
#3  0x00003fffad400e1c in __GI_exit (status=<optimized out>) at exit.c:104 
No locals. 
#4  0x000000001000984c in cleanup_and_exit (signum=<optimized out>) at glusterfsd.c:1295 
    ctx = <optimized out> 
    trav = <optimized out> 
    __FUNCTION__ = <error reading variable __FUNCTION__ (Cannot access memory at address 0x10010e38)> 
#5  0x0000000010009a64 in glusterfs_sigwaiter (arg=<optimized out>) at glusterfsd.c:2016 
    set = {__val = {18947, 0 <repeats 15 times>}} 
    ret = <optimized out> 
    sig = 15 
#6  0x00003fffad57db30 in start_thread (arg=0x3fffab302160) at pthread_create.c:462 
    pd = 0x3fffab302160 
    now = <optimized out> 
    unwind_buf = {cancel_jmp_buf = {{jmp_buf = {5451414826039278896, 70367357615104, 5451414826003312788, 0, 0, 70367312883712, 70367321268768, 8388608, 
            70367357575200, 70367913735952, 268595776, 70367357600728, 268588656, 3, 0, 70367357600744, 70367913735600, 70367913735656, 4001536, 
            70367357576216, 70367321265984, -3187653564, 0 <repeats 42 times>}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = "" = 0x0, 
          cleanup = 0x0, canceltype = 0}}} 
    not_first_call = <optimized out> 
    pagesize_m1 = <optimized out> 
    sp = <optimized out> 
    freesize = <optimized out> 
    __PRETTY_FUNCTION__ = "start_thread" 
---Type <return> to continue, or q <return> to quit--- 
#7  0x00003fffad4c7cdc in .__clone () at ../sysdeps/unix/sysv/linux/powerpc/powerpc64/clone.S:96 
No locals 

Can you please help us in finding the cause for SIGSEGV. ? 
Also please share your understanding on this issue.

--

Regards
Abhishek Paliwal

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