Messages in this thread | | | Subject | Re: [BLOCK] bh: Ensure bh fits within a page | From | Badari Pulavarty <> | Date | Thu, 17 Aug 2006 16:14:16 -0700 |
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On Wed, 2006-08-02 at 09:30 +1000, Herbert Xu wrote: > Jens Axboe <axboe@suse.de> wrote: > > > > That looks really dangerous, I'd prefer that to be a BUG_ON() as well to > > prevent nastiness further down. > > OK, I used a WARN_ON mainly because ext3 has been doing this for years > without killing anyone until now :) > > [BLOCK] bh: Ensure bh fits within a page > > There is a bug in jbd with slab debugging enabled where it was submitting > a bh obtained via jbd_rep_kmalloc which crossed a page boundary. A lot > of time was spent on tracking this down because the symptoms were far off > from where the problem was. > > This patch adds a sanity check to submit_bh so we can immediately spot > anyone doing similar things in future. > > Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> > > Cheers,
Hi,
I am working on a fix to address this problem. Do you have any testcases to reproduce the problem ? I have been running bunch of tests with CONFIG_DEBUG_SLAB with WARN_ON() and I haven't seen it yet :(
Wondering, if there is any special thing I need to do to reproduce the problem ? Please let me know.
Thanks, Badari
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