While running ping-pong test with afr with 4 servers + 4 clients 
one server crashed.
# mdb /core 
Loading modules: [ ld.so.1 libc.so.1 ]
> $C
fffffd7ffe3ff1e0 libc.so.1`_lwp_kill+0xa()
fffffd7ffe3ff200 libc.so.1`raise+0x19()
fffffd7ffe3ff750 libglusterfs.so.0.0.0`gf_print_trace+0x3b8()
fffffd7ffe3ff760 libc.so.1`__sighndlr+6()
fffffd7ffe3ff7d0 libc.so.1`call_user_handler+0x252()
fffffd7ffe3ff800 libc.so.1`sigacthandler+0xde(b, 0, fffffd7ffe3ff820)
fffffd7ffe3ffc00 locks.so.0.0.0`list_del_init+0x17()
fffffd7ffe3ffc20 locks.so.0.0.0`__delete_lock+0x19()
fffffd7ffe3ffc80 locks.so.0.0.0`__insert_and_merge+0x1fa()
fffffd7ffe3ffce0 locks.so.0.0.0`__insert_and_merge+0x150()
fffffd7ffe3ffd40 locks.so.0.0.0`__insert_and_merge+0x150()
fffffd7ffe3ffda0 locks.so.0.0.0`__insert_and_merge+0x150()
fffffd7ffe3ffe30 locks.so.0.0.0`pl_setlk+0x105()
fffffd7ffe3ffef0 locks.so.0.0.0`pl_lk+0x273()
fffffd7ffe3fff40 io-threads.so.0.0.0`iot_lk_wrapper+0x181()
fffffd7ffe3fff70 libglusterfs.so.0.0.0`call_resume_wind+0x74c()
fffffd7ffe3fff90 libglusterfs.so.0.0.0`call_resume+0xc7()
fffffd7ffe3fffc0 io-threads.so.0.0.0`iot_worker_ordered+0x3b()
fffffd7ffe3fffe0 libc.so.1`_thr_setup+0x5b()
fffffd7ffe3ffff0 libc.so.1`_lwp_start()


server log file:
---------------

[2010-06-30 13:21:07] D [compat.c:365:solaris_getxattr] libglusterfs: Couldn't read extended attribute for the file /export/home/gluster/laks/export3//ker (61)
[2010-06-30 13:21:07] D [compat.c:365:solaris_getxattr] libglusterfs: Couldn't read extended attribute for the file /export/home/gluster/laks/export3//ker (61)
[2010-06-30 13:21:07] D [compat.c:365:solaris_getxattr] libglusterfs: Couldn't read extended attribute for the file /export/home/gluster/laks/export3//ker (61)
[2010-06-30 13:21:07] D [compat.c:365:solaris_getxattr] libglusterfs: Couldn't read extended attribute for the file /export/home/gluster/laks/export3//ker (61)
[2010-06-30 13:21:07] D [compat.c:365:solaris_getxattr] libglusterfs: Couldn't read extended attribute for the file /export/home/gluster/laks/export3//ker (61)
[2010-06-30 13:21:07] D [compat.c:365:solaris_getxattr] libglusterfs: Couldn't read extended attribute for the file /export/home/gluster/laks/export3//ker (61)
[2010-06-30 13:21:07] D [compat.c:365:solaris_getxattr] libglusterfs: Couldn't read extended attribute for the file /export/home/gluster/laks/export3//ker (61)
[2010-06-30 13:21:07] T [posix.c:1458:posix_janitor_thread_proc] posix1: janitor: closing dir fd=fffffd7fff030780
[2010-06-30 13:22:22] T [common.c:881:pl_setlk] locks1: Lock (pid=24001) lk-owner:16815187247079975987 0 - 0 => OK
pending frames:
frame : type(1) op(LK)
frame : type(1) op(LK)

patchset: v3.0.4-48-gda1123b
signal received: 11
time of crash: 2010-06-30 13:22:22
configuration details:
dlfcn 1
libpthread 1
spinlock 1
st_atim.tv_nsec 1
package-string: glusterfs 3.0.5rc7