[linux-lvm] Frequent crashes when accessing dev_name(dev) on an empty list

[David Teigland]

On Mon, Feb 21, 2022 at 04:45:51PM +0300, Konstantin Kharlamov wrote:
> So, what happened was that dev_name(dev) was extracting a `dev->aliases` element
> , however `dev->aliases` was empty, thus the extracted element was a junk.
> 
> Although we encountered these crashes on an older 2.03.07 version, however the
> patch applies to latest master as well, thus the bugs are still relevant, which
> is odd. This makes me wondering, is this a known problem, could I possibly
> overlooked something, for example that dev->aliases should never be empty, and
> thus the fix just works around another problem? Any thoughts?

It's familiar, but I thought it was fixed.  I don't remember the details,
so we'll have to look at it again.  It's related to a device being removed
from the system while the command is running, which we need to add tests
for.

Dave