[linux-lvm] Kernel panic while snapshotting.

[AJ Lewis]

Which kernel were you using?  2.2.18 or 2.4.0?

On Fri, Jan 19, 2001 at 07:56:26AM -0800, Jay Weber wrote:
> Hi,
> 
> I just got a kernel panic while snapshotting with 0.9.1beta2.  I wonder if
> anybody has seen any similar issues or I possibly fubar'd the patch on my
> end?
> 
> Panic was:
> 
> 	Kernel panic: brw_kiovec: iobuf not locked for I/O
> 
> This occured while simultanously copying 20 tarballs back and forth
> between two dirs on the source volume and performing a snapshot at that
> time.  It appears to have hung my lvcreate (snapshot) command shell.
> Oh, this was also using loop device for the source volume on my laptop in
> this case.  Hmm, actually could this panic be related to the following
> change in lvm.c?  It did work prior in 0.9.1beta1.
> 
> @@ -492,7 +488,7 @@
>                 goto out;
> 
>         err = -ENOMEM;
> -       iobuf->locked = 1;
> +       iobuf->locked = 0;
>         iobuf->nr_pages = 0;
>         for (i = 0; i < nr_pages; i++)
>         {
> 
> 
> I haven't seen this one before myself, but in testing on our bigger scsi
> based boxes in the back while snapshots are active and heavy IO is
> performed on the source volume, the box tends to hang.  I gather this is
> related to having to journal all source volume changes to the snapshot and
> when you throw massive IO at it, things get slow. Any thoughts on this one
> as well?
> 
> _______________________________________________
> linux-lvm mailing list
> linux-lvm at sistina.com
> http://lists.sistina.com/mailman/listinfo/linux-lvm

-- 
AJ Lewis
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