No. There is no oops in the /var/log/messages when the mount command
From: Dave Chinner [mailto:david@xxxxxxxxxxxxx]
Sent: Monday, October 13, 2008 12:00 AM
To: Ngo, Andrew
Cc: xfs@xxxxxxxxxxx; Johnson, Je
Subject: Re: Stale XFS mount for Kernel 220.127.116.11
On Sun, Oct 12, 2008 at 10:10:54PM -0400, Ngo, Andrew wrote:
> This is my first attempt to report a stale mount problem. If this is
> not the relevant mail list, please let me know. I suspect that my
> problem is xfs related, thus I select this mailing list.
> I have a system that recently upgraded it's kernel to 18.104.22.168. The
> system's previous kernel was 2.6.18.-8.el5. With the previous kernel,
> I have no problem with executing the following commands when the
> system is in operation. Note that the /mnt/mountpoint is mounted on a
> XFS file system.
> mount -o rw,remount /mnt/mountpoint
> mount -o ro,remount /mnt/mountpoint
> With kernel 22.214.171.124, however, the mount command may be hang when
> changing from rw to ro. When this happen, system is very sluggish.
That's because the remount,ro is actually flushing all the dirty data to
disk in 2.6.25. There is also a check to catch when the remount,ro fails
to clean everything that is dirty - that's probably what is triggering.
Do you have an oops in the dmesg log when mount hangs?