CONFIG_PREEMPT and JFFS2 oops

[Joakim Tjernlund]

>
> On 01/25/2012 10:18 PM, Paul Walmsley wrote:
> > - If your oopses are consistently in the same places, add some debugging
> >    to that code to determine which line is actually causing the oops.
>
> (CC:d linux-mtd.)
>
> They are semi-consistent I'd say.  The oops trace I posted is by far the
> most common.
>
> >    problem to mysteriously disappear.  Doing this analysis should provide a
> >    good clue as to where to look next.  I personally would be rather
> >    suspicious of that
> >
> >       ri->data_crc = cpu_to_je32(crc32(0, comprbuf, cdatalen));
> >
> >    in jffs2_write_inode_range().
>
> That is indeed the place where crc32 is called from .  I'll see it I can
> track the use of comprbuf.
>
> > - Try turning on JFFS2 debugging and seeing if you can reproduce it.
> >    The output might provide a clue as to where the problem would be.
>

I would also turn off SUMMARY in JFFS2, I tried it long ago and it didn't make
much of a difference.

 Jocke