On Wed, Dec 23, 2020 at 3:37 PM Maciej S. Szmigiero <mail@xxxxxxxxxxxxxxxxxxxxx> wrote: > > On 14.12.2020 19:11, Maciej S. Szmigiero wrote: > > Hi, > > > > I hit a reproducible BUG() when scrubbing a btrfs fs on top of > > a dm-crypt device with no_read_workqueue and no_write_workqueue > > flags enabled. > > Still happens on the current torvalds/master. > > Due to this bug it is not possible to use btrfs on top of > a dm-crypt device with no_read_workqueue and no_write_workqueue > flags enabled. > > @Ignat: > Can you have a look at this as the person who added these flags? I've been looking into this for the last couple of days because of other reports [1]. Just finished testing a possible solution. Will submit soon. > It looks like to me that the skcipher API might not be safe to > call from a softirq context, after all. It is less about skcipher API and more about how dm-crypt uses it as well as some assumptions that it is always running in context which can sleep. > Maciej Ignat [1]: https://github.com/cloudflare/linux/issues/1
