On 01/21/2015 12:33 PM, Jens Axboe wrote:
On 01/21/2015 12:29 PM, Christoph Hellwig wrote:
On Wed, Jan 21, 2015 at 12:17:07PM -0700, Jens Axboe wrote:
Christoph,
Ran into this one while testing. Looks like mapping->host is NULL, off
the shmem_writepage().
Hmm. Not sure how this can happen, but for a NULL inode we can
always just return noop_backing_dev_info safely, I'll cook up a patch.
I got 8 of them in a row. Current kernel is running with the attached,
just to see if I can reproduce it.
Works fine with the debug patch. Added a page dump for when we hit this:
page:ffffea0001afa680 count:2 mapcount:0 mapping: (null) index:0x0
flags: 0x40000000000d0009(locked|uptodate|swapcache|reclaim|swapbacked)
I'll commit the NULL inode work-around.
--
Jens Axboe
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