On Mon, 2020-01-13 at 14:00 +0800, Ian Kent wrote:

On Mon, 2020-01-13 at 03:54 +0000, Al Viro wrote:

quoted

On Mon, Jan 13, 2020 at 09:48:23AM +0800, Ian Kent wrote:

quoted

I did try this patch and I was trying to work out why it didn't
work. But thought I'd let you know what I saw.

Applying it to current Linus tree systemd stops at switch root.

Not sure what causes that, I couldn't see any reason for it.

Wait a minute...  So you are seeing problems early in the boot,
before any autofs ioctls might come into play?

I did, then I checked it booted without the patch, then tried
building from scratch with the patch twice and same thing
happened each time.

Looked like this, such as it is:
[ OK ] Reached target Switch Root.
[ OK ] Started Plymouth switch root service.
       Starting Switch Root...

I don't have any evidence but thought it might be this:
https://github.com/karelzak/util-linux/blob/master/sys-utils/switch_root.c

Oh wait, for systemd I was actually looking at:
https://github.com/systemd/systemd/blob/master/src/shared/switch-root.c

Mind you, that's not the actual systemd repo. either I probably
need to look a lot deeper (and at the actual systemd repo) to
work out what's actually being called.

quoted

Sigh...  Guess I'll have to dig that Fedora KVM image out and
try to see what it's about... ;-/  Here comes a couple of hours
of build...