Hi,
On Wed, 22 Nov 2017 15:35:35 -0800
Liu Bo <bo.li.liu@xxxxxxxxxx> wrote:
> On Mon, Nov 20, 2017 at 02:00:07AM -0500, Jérôme Carretero wrote:
> > ------------[ cut here ]------------ [633254.461294] WARNING: CPU:
> > 3 PID: 20953 at /usr/src/linux/fs/btrfs/raid56.c:848
> > __free_raid_bio+0x8e/0xa0
>
>
> The vanilla 4.14.0 shows it is
> WARN_ON(!bio_list_empty(&rbio->bio_list)); but we just emptied
> rbio->bio_list two lines above, i.e. struct bio *cur =
> bio_list_get(&rbio->bio_list);
>
> Either we have some weird race, or the line number is misleading me.
>
> Can you please check the code which warning fs/btrfs/raid56.c:848
> points to?
Same code as yours:
WARN_ON(!bio_list_empty(&rbio->bio_list));
So yeah, at least git is not broken, now it could be a very weird
compiler bug or a less-weird race indeed...
Regards,
--
Jérôme
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