On Tue, 30 Jul 2019 at 10:29, Jan Kara <[email protected]> wrote: > > Thanks for the notice and the references. What's your version of > util-linux? What your test script does is indeed racy. You have there: > > echo Running: > for i in {a..z}{a..z}; do > mount $i.squash /mnt/$i & > done > > So all mount(8) commands will run in parallel and race to setup loop > devices with LOOP_SET_FD and mount them. However util-linux (at least in > the current version) seems to handle EBUSY from LOOP_SET_FD just fine and > retries with the new loop device. So at this point I don't see why the patch > makes difference... I guess I'll need to reproduce and see what's going on > in detail.
We've observed this in arch with util-linux 2.34, and ubuntu 19.10 (eoan ermine) with util-linux 2.33. just to be clear, the initial reports didn't involve a zany loop of mounts, but were triggered by effectively the same thing as systemd booted a system with a lot of snaps. The reroducer tries to makes things simpler to reproduce :-). FWIW, systemd versions were 244 and 242 for those systems, respectively.
