The current f11 binaries work fine.

gcc-4.4.4-10.fc12.x86_64
glibc-2.11.2-1.x86_64

built with:
rpmbuild --rebuild http://ftp.gluster.com/pub/gluster/glusterfs/3.0/LATEST/Fedora/glusterfs-3.0.5-1.fc11.src.rpm

To duplicate, start the server, mount the client, ls -l <client mount point>

================================================================================
Version      : glusterfs 3.0.5 built on Aug 11 2010 12:35:56
git: v3.0.5
Starting Time: 2010-08-11 13:34:42
Command line : /usr/sbin/glusterfs --log-level=NORMAL --volfile=/etc/glusterfs/glusterfs.vol /mnt/gluster
PID          : 31634
System name  : Linux
Nodename     : strabo2.julianfamily.org
Kernel Release : 2.6.32.14-127.fc12.x86_64
Hardware Identifier: x86_64

Given volfile:
+------------------------------------------------------------------------------+
  1: volume cbrick0
  2:   type protocol/client
  3:   option transport-type tcp
  4:   option remote-host 127.0.0.1
  5:   option remote-subvolume brick0
  6: end-volume
  7: volume cbrick1
  8:   type protocol/client
  9:   option transport-type tcp
 10:   option remote-host 127.0.0.1
 11:   option remote-subvolume brick1
 12: end-volume
 13: volume cbrick2
 14:   type protocol/client
 15:   option transport-type tcp
 16:   option remote-host 127.0.0.1
 17:   option remote-subvolume brick2
 18: end-volume
 19: volume cbrick3
 20:   type protocol/client
 21:   option transport-type tcp
 22:   option remote-host 127.0.0.1
 23:   option remote-subvolume brick3
 24: end-volume
 25:
 26: volume repl0
 27:   type cluster/replicate
 28:   subvolumes cbrick0 cbrick1
 29: end-volume
 30:
 31: volume repl1
 32:   type cluster/replicate
 33:   subvolumes cbrick2 cbrick3
 34: end-volume
 35:
 36: volume distribute
 37:   type cluster/distribute
 38:   subvolumes repl0 repl1
 39: end-volume
 40:
 41: #volume writebehind
 42: #  type performance/write-behind
 43: #  option cache-size 64MB
 44: #  subvolumes distribute
 45: #end-volume
 46:
 47: #volume ioc
 48: #  type performance/io-cache
 49: #  option cache-size 64MB
 50: #  subvolumes writebehind
 51: #end-volume
 52:
 53: #volume trace
 54: #  type debug/trace
 55: #  subvolumes ioc
 56: #  option include open,close,create,readdir,opendir,closedir
 57: #  option exclude lookup,read,write
 58: #end-volume

+------------------------------------------------------------------------------+
[2010-08-11 13:34:42] N [glusterfsd.c:1409:main] glusterfs: Successfully started
[2010-08-11 13:34:42] N [client-protocol.c:6288:client_setvolume_cbk] cbrick0: Connected to 127.0.0.1:6996, attached to remote volume 'brick0'.
[2010-08-11 13:34:42] N [afr.c:2648:notify] repl0: Subvolume 'cbrick0' came back up; going online.
[2010-08-11 13:34:42] N [fuse-bridge.c:2953:fuse_init] glusterfs-fuse: FUSE inited with protocol versions: glusterfs 7.13 kernel 7.13
[2010-08-11 13:34:42] N [client-protocol.c:6288:client_setvolume_cbk] cbrick0: Connected to 127.0.0.1:6996, attached to remote volume 'brick0'.
[2010-08-11 13:34:42] N [afr.c:2648:notify] repl0: Subvolume 'cbrick0' came back up; going online.
[2010-08-11 13:34:42] N [client-protocol.c:6288:client_setvolume_cbk] cbrick1: Connected to 127.0.0.1:6996, attached to remote volume 'brick1'.
[2010-08-11 13:34:42] N [client-protocol.c:6288:client_setvolume_cbk] cbrick1: Connected to 127.0.0.1:6996, attached to remote volume 'brick1'.
[2010-08-11 13:34:42] N [client-protocol.c:6288:client_setvolume_cbk] cbrick2: Connected to 127.0.0.1:6996, attached to remote volume 'brick2'.
[2010-08-11 13:34:42] N [afr.c:2648:notify] repl1: Subvolume 'cbrick2' came back up; going online.
[2010-08-11 13:34:42] N [client-protocol.c:6288:client_setvolume_cbk] cbrick2: Connected to 127.0.0.1:6996, attached to remote volume 'brick2'.
[2010-08-11 13:34:42] N [afr.c:2648:notify] repl1: Subvolume 'cbrick2' came back up; going online.
[2010-08-11 13:34:42] N [client-protocol.c:6288:client_setvolume_cbk] cbrick3: Connected to 127.0.0.1:6996, attached to remote volume 'brick3'.
[2010-08-11 13:34:42] N [client-protocol.c:6288:client_setvolume_cbk] cbrick3: Connected to 127.0.0.1:6996, attached to remote volume 'brick3'.
pending frames:
frame : type(1) op(STAT)

patchset: v3.0.5
signal received: 6
time of crash: 2010-08-11 13:34:50
configuration details:
argp 1
backtrace 1
dlfcn 1
fdatasync 1
libpthread 1
llistxattr 1
setfsid 1
spinlock 1
epoll.h 1
xattr.h 1
st_atim.tv_nsec 1
package-string: glusterfs 3.0.5
/lib64/libc.so.6[0x3f51032740]
/lib64/libc.so.6(gsignal+0x35)[0x3f510326c5]
/lib64/libc.so.6(abort+0x175)[0x3f51033ea5]
/lib64/libc.so.6[0x3f5106f133]
/lib64/libc.so.6(__fortify_fail+0x37)[0x3f510f7707]
/lib64/libc.so.6[0x3f510f5720]
/usr/lib64/glusterfs/3.0.5/xlator/protocol/client.so(client_lookup+0x1cb)[0x7f4061fd9c1b]
/usr/lib64/glusterfs/3.0.5/xlator/cluster/replicate.so(afr_lookup+0x433)[0x7f4061d91d83]
/usr/lib64/glusterfs/3.0.5/xlator/cluster/distribute.so(dht_lookup+0x20f)[0x7f4061b7d6ff]
/usr/lib64/glusterfs/3.0.5/xlator/mount/fuse.so(fuse_first_lookup+0x162)[0x7f40619533e2]
/usr/lib64/glusterfs/3.0.5/xlator/mount/fuse.so(+0x47ed)[0x7f40619537ed]
/lib64/libpthread.so.0[0x3f51c06a3a]
/lib64/libc.so.6(clone+0x6d)[0x3f510de77d]
---------


volume posix0
  type storage/posix
  option directory /home/cluster/0
end-volume
volume posix1
  type storage/posix
  option directory /home/cluster/1
end-volume
volume posix2
  type storage/posix
  option directory /home/cluster/2
end-volume
volume posix3
  type storage/posix
  option directory /home/cluster/3
end-volume

volume lock0
  type features/locks
  subvolumes posix0
end-volume
volume lock1
  type features/locks
  subvolumes posix1
end-volume
volume lock2
  type features/locks
  subvolumes posix2
end-volume
volume lock3
  type features/locks
  subvolumes posix3
end-volume

volume brick0
  type performance/io-threads
  option thread-count 8
  subvolumes lock0
end-volume
volume brick1
  type performance/io-threads
  option thread-count 8
  subvolumes lock1
end-volume
volume brick2
  type performance/io-threads
  option thread-count 8
  subvolumes lock2
end-volume
volume brick3
  type performance/io-threads
  option thread-count 8
  subvolumes lock3
end-volume

volume server
  type protocol/server
  option transport-type tcp
  option transport.socket.bind-address 127.0.0.1
  subvolumes brick0 brick1 brick2 brick3
  option auth.addr.brick0.allow 127.0.0.1
  option auth.addr.brick1.allow 127.0.0.1
  option auth.addr.brick2.allow 127.0.0.1
  option auth.addr.brick3.allow 127.0.0.1
end-volume