[buildd-tools-devel] Bug#829125: schroot: schroot doesn't clean up its bind mounts if used concurrently

[Dima Kogan]

Roger Leigh <rleigh at codelibre.net> writes:

> While I don't have a concrete solution to hand, some thoughts:
>
> Are you running systemd?

Yes. This is a very recent install of Debian/sid.


> Does the problem occur when you run sysvinit?

Don't know yet.


> Have you altered any of the setup scripts to do rbind in place of
> bind?

Nope. Everything is fairly vanilla.


> Can you reproduce this by hand by starting a session, then creating a 
> temporary directory and bind mounting the same stuff into it?  That is, 
> to recreate the 10mount setup script actions step by step.

I haven't tried debugging it yet. Writing up the failure into this
report is the bulk of the work I put into this so far.


> My suspicion here is that systemd is changing the mount behaviour and 
> that you're getting this erroneous mount as a side effect.  The point of 
> the above test is to check whether this is a schroot issue or a more 
> general problem with mount(8).  Since schroot isn't doing anything more 
> than a series of mount invocations in a shell script and mount helper, 
> it's unlikely to cause bizarre side effects in and of itself.

OK, that's good to know. Hopefully I'll get the chance to look at it in
a few days.

For the record, this doesn't happen with bash instead of zsh. The
chroots are fairly vanilla centos installs made with rinse.