[Linux-cluster] Kernel oops on GFS umount

[O'Sullivan, Damian]

If I ever reboot a node on a cluster it panics on the way down: 

Process umount (pid: 22814, threadinfo 00000100775fe000, task
000001007fb95030)
Stack: 0000000000000084 ffffffff801f5163 0000000000000058
ffffff00102fe000
       00000100276d7cf0 ffffffffa0295b96 0000000000000001
ffffffffa025c8c4
       0000000000000001 ffffffffa02533c3
Call Trace:<ffffffff801f5163>{vgacon_cursor+0}
<ffffffffa0295b96>{:lock_dlm:lm_d
lm_unlock+21}
       <ffffffffa025c8c4>{:gfs:gfs_lm_unlock+41}
<ffffffffa02533c3>{:gfs:gfs_glo
ck_drop_th+290}
       <ffffffffa0251b70>{:gfs:run_queue+314}
<ffffffffa02528ca>{:gfs:gfs_glock_
dq+323}
       <ffffffffa0252908>{:gfs:gfs_glock_dq_uninit+9}
<ffffffffa0272ee0>{:gfs:gf
s_make_fs_ro+118}
       <ffffffffa026b1a0>{:gfs:gfs_put_super+654}
<ffffffff8017c4b1>{generic_shu
tdown_super+202}
       <ffffffffa0268c6d>{:gfs:gfs_kill_sb+42}
<ffffffff801cbe58>{dummy_inode_pe
rmission+0}
       <ffffffff8017c3ce>{deactivate_super+95}
<ffffffff80191847>{sys_umount+925
}
       <ffffffff80110aed>{error_exit+0}
<ffffffff80110052>{system_call+126}


Code: 0f 0b 4e a1 29 a0 ff ff ff ff 65 01 48 c7 c7 53 a1 29 a0 31
RIP <ffffffffa0295819>{:lock_dlm:do_dlm_unlock+167} RSP
<00000100775ffca8>
 <0>Kernel panic - not syncing: Oops

Kernel : 2.6.9-22.0.1.Elsmp
         GFS-6.1.2-0

D.