On Tuesday December 12, jasper@spaans.ds9a.nl wrote:
> On Tue, Dec 12, 2000 at 11:06:07AM -0800, Linus Torvalds wrote:
> >
> > To get better debug output, could you please do something for me?
> >
> > In fs/buffer.c, get rid of "end_buffer_io_bad" completely, and replace all
> > users of it with NULL.
> >
> > Then, in drivers/block/ll_rw_block.c: generic_make_request(), add a test
> > like
> >
> > if (!bh->b_end_io) BUG();
> >
> > to the top of that function.
Could you add this test to the top of md_make_request as well, because
requests to raid5 don't go through generic_make_request.
>
> Strange thing is that it doesn't call BUG() and the trace seems quite
> identical -- this caused me to start looking at the code in
> drivers/md/raid5.c and it seems this null pointer deref is coming from there
> - Neil, do you have some documentation on how this code should work, as
> stripe_head causes some null-pointer-derefs inside my head..
No, no doco, sorry.
I do have a new version of the code that I haven't been brave enough
to submit during a code freeze (whatever that is)... you could try
the raid5 patch under
http://www.cse.unsw.edu.au/~neilb/patches/linux/2.4.0-test12-pre8
I expect that you will get the same result as I don't (currently)
think the bug is in RAID code, but at least I would get one more
tester for my code....
NeilBrown
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