On Thu, Jun 06, 2019 at 04:54:44PM +0900, Naohiro Aota wrote:
> Currently, btrfs does not consult seed devices to start readahead. As a
> result, if readahead zone is added to the seed devices, btrfs_reada_wait()
> indefinitely wait for the reada_ctl to finish.
>
> You can reproduce the hung by modifying btrfs/163 to have larger initial
> file size (e.g. xfs_io pwrite 4M instead of current 256K).
>
> Fixes: 7414a03fbf9e ("btrfs: initial readahead code and prototypes")
> Cc: stable@xxxxxxxxxxxxxxx # 3.2+: ce7791ffee1e: Btrfs: fix race between readahead and device replace/removal
> Cc: stable@xxxxxxxxxxxxxxx # 3.2+
> Signed-off-by: Naohiro Aota <naohiro.aota@xxxxxxx>
Thanks, added to misc-next.
