Re: 2.6.18 ext3 panic.

Dave Jones
2006-10-03T16:45:48Z

On Tue, Oct 03, 2006 at 02:40:30AM -0400, Dave Jones wrote:

> > > > ----------- [cut here ] --------- [please bite here ] ---------
> > > > Kernel BUG at fs/buffer.c:2791
> > >
> > > I had thought/hoped that this was fixed by Jan's patch at
> > > http://lkml.org/lkml/2006/9/7/236 from the thread started at
> > > http://lkml.org/lkml/2006/9/1/149, but it seems maybe not. Dave hit this bug
> > > first by going through that new codepath....
> >
> > Yes, Jan's patch is supposed to fix that !buffer_mapped() assertion. iirc,
> > Badari was hitting that BUG and was able to confirm that Jan's patch
> > (3998b9301d3d55be8373add22b6bc5e11c1d9b71 in post-2.6.18 mainline) fixed
> > it.
>
> Ok, this afternoon I was definitly running a kernel with that patch in it,
> and managed to get a trace (It was the one from the top of this thread
> that unfortunatly got truncated).
>
> Now, I can't reproduce it on a plain 2.6.18+that patch.
> I'll leave the stress test running overnight, and see if anything
> falls out in the morning.

Been chugging away for 10 hrs now without repeating that incident. Hmm.
That patch looks like good -stable material. I'll keep digging to
see if I can somehow reproduce the problem I saw with the patch applied,
but in absense of something better, I think we should go with it.

One thing that did happen in the 10hrs was fsx-over-NFS spewed some
nasty looking trace. I'll post that separately next.

Dave

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