[Buildd-tools-devel] Bug#489116: Bug#489116: schroot: possible race condition during chroot setup?

[Roger Leigh]

Lucas Nussbaum <lucas at lucas-nussbaum.net> writes:

> I run several instances of sbuild+schroot in parallel. Sometimes, I run
> into the following error message:
> Build started at 20080703-0045
> ******************************************************************************
> Cannot create link /etc/mtab~
> Perhaps there is a stale lock file?
>
> E: lsid32-ba72d12e-d721-4f01-aa83-78ce46e9691c: Chroot setup failed: stage=setup-start
> Chroot setup failed
> Error creating schroot session: skipping zope-ldapmultiplugins
> ******************************************************************************
>
> Could this be caused by a race condition in schroot or sbuild ? I
> never ran into this when I was running only one instance at a time.

While it is possible that a race condition exists, I can't find any
reference to "Cannot create link" or /etc/mtab in either the schroot
or sbuild sources.  I don't know where that message is coming from.

Which chroot type are you using with sbuild/schroot?  The locking can
vary between the different types, and some (e.g. plain, directory)
shouldn't be used if you are running sbuild in parallel, though sbuild
itself should do its own locking in this case and catch the problem.


Regards,
Roger

-- 
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