Bug 761971 (GLUSTER-239)

Client configuration consists of quick-read on protocol/client.

Backtrace is given below.
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xb6c45b90 (LWP 6355)]
0xb747e1d1 in list_del (old=0xa883188c) at ../../../../../libglusterfs/src/list.h:60
60              old->prev->next = old->next;
(gdb) bt
#0  0xb747e1d1 in list_del (old=0xa883188c) at ../../../../../libglusterfs/src/list.h:60
#1  0xb7483637 in protocol_client_mark_fd_bad (this=0x80d5c80)
    at ../../../../../xlators/protocol/client/src/client-protocol.c:5666
#2  0xb7484896 in notify (this=0x80d5c80, event=4, data=0x810e6d0)
    at ../../../../../xlators/protocol/client/src/client-protocol.c:6248
#3  0xb7f61a2a in socket_event_poll_err (this=0x810e6d0) at ../../../../transport/socket/src/socket.c:420
#4  0xb7f625f4 in socket_event_handler (fd=9, idx=0, data=0x810e6d0, poll_in=1, poll_out=0, poll_err=0)
    at ../../../../transport/socket/src/socket.c:818
#5  0xb7d159e9 in event_dispatch_epoll_handler (event_pool=0x80d0fc8, events=0x810f448, i=0)
    at ../../../libglusterfs/src/event.c:804
#6  0xb7d15ba8 in event_dispatch_epoll (event_pool=0x80d0fc8) at ../../../libglusterfs/src/event.c:867
#7  0xb7d15ea2 in event_dispatch (event_pool=0x80d0fc8) at ../../../libglusterfs/src/event.c:975
#8  0xb7cd0581 in poll_proc (ptr=0x80d0ed8) at ../../../libglusterfsclient/src/libglusterfsclient.c:633
#9  0xb7e75383 in start_thread () from /lib/libpthread.so.0
#10 0xb7df605e in clone () from /lib/libc.so.6
(gdb) p *old
$1 = {next = 0xbabebabe, prev = 0xcafecafe}
(gdb) info thr
  3 Thread 0xb7445b90 (LWP 6354)  0xb7db579c in nanosleep () from /lib/libc.so.6
* 2 Thread 0xb6c45b90 (LWP 6355)  0xb747e1d1 in list_del (old=0xa883188c)
    at ../../../../../libglusterfs/src/list.h:60
  1 Thread 0xb7cc9980 (LWP 6353)  0xb7e7c65e in accept () from /lib/libpthread.so.0
(gdb) thr 1
[Switching to thread 1 (Thread 0xb7cc9980 (LWP 6353))]#0  0xb7e7c65e in accept () from /lib/libpthread.so.0
(gdb) bt
#0  0xb7e7c65e in accept () from /lib/libpthread.so.0
#1  0xb7ee41ed in apr_socket_accept (new=0xbf921090, sock=0x8114a88, connection_context=0x81c9828)
    at network_io/unix/sockets.c:184
#2  0x080addb5 in unixd_accept (accepted=0xbf9210c0, lr=0x8114a68, ptrans=0x81c9828) at unixd.c:506
#3  0x080abf08 in child_main (child_num_arg=0) at prefork.c:631
#4  0x080ac066 in make_child (s=0x811b1b0, slot=0) at prefork.c:690
#5  0x080ac550 in ap_mpm_run (_pconf=0x8116578, plog=0x8154670, s=0x811b1b0) at prefork.c:966
#6  0x08064304 in main (argc=4, argv=0xbf920fdc) at main.c:740
(gdb) thr 3
[Switching to thread 3 (Thread 0xb7445b90 (LWP 6354))]#0  0xb7db579c in nanosleep () from /lib/libc.so.6
(gdb) bt
#0  0xb7db579c in nanosleep () from /lib/libc.so.6
#1  0xb7def43c in usleep () from /lib/libc.so.6
#2  0xb7d04c57 in gf_timer_proc (ctx=0x80d0ed8) at ../../../libglusterfs/src/timer.c:177
#3  0xb7e75383 in start_thread () from /lib/libpthread.so.0
#4  0xb7df605e in clone () from /lib/libc.so.6
(gdb) thr 2
[Switching to thread 2 (Thread 0xb6c45b90 (LWP 6355))]#0  0xb747e1d1 in list_del (old=0xa883188c)
    at ../../../../../libglusterfs/src/list.h:60
60              old->prev->next = old->next;
(gdb) up
#1  0xb7483637 in protocol_client_mark_fd_bad (this=0x80d5c80)
    at ../../../../../xlators/protocol/client/src/client-protocol.c:5666
warning: Source file is more recent than executable.
5666                    list_del (&fdctx->sfd_pos);
(gdb) p fdctx
$2 = (client_fd_ctx_t *) 0xa8831888
(gdb) p *fdctx
$3 = {remote_fd = 0, sfd_pos = {next = 0xbabebabe, prev = 0xcafecafe}, fd = 0xaff136a0}
(gdb) p *fdctx->fd
$4 = {pid = -1346093408, flags = 1668444975, refcount = 1852402735, inode_list = {next = 0x322d7875, 
    prev = 0x322e362e}, inode = 0x2f352e34, ctx = 0x69726373, lock = 7566448, _ctx = 0x0}