On Wed, Dec 04, 2024 at 12:26:53PM +0100, Johan Hovold wrote: > Hi, > > I'm seeing a new lockdep splat with 6.13-rc1 on resume after having > disconnected a USB mass storage device while suspended. This does not > seem to show up with 6.12. > > On one attempt to reproduce this with a ThinkPad T14s, the NVMe was > hosed after resume as well so I fear that this is not just about missing > annotation. > > I don't have time to look into this myself right now so I'm reporting in > the hope that someone familiar with these paths would be able to > pinpoint any potential regression without too much effort. > The dependency between lock(&q->q_usage_counter(queue)#3) and lock(&q->limits_lock) is real trouble. The real deadlock was reported before: https://lore.kernel.org/linux-scsi/ZxG38G9BuFdBpBHZ@fedora/ And the warning can be triggered by the following command too: echo 'none' > /sys/block/sda/queue/write_cache Thanks, Ming
