[Lxc-users] Strange heisenbug "no space left on device" errors, leftover ephemeralbind mounts?

[Stéphane Graber]

On 12-09-10 07:31 PM, Dan Kegel wrote:
> This is probably just a bad dream that will end when I move to
> running lxc inside vmware instead of virtualbox.
> 
> I'm running Ubuntu 12.04.1 in Virtualbox, and inside that, Ubuntu 10.04 via
> lxc-start-ephemeral, and inside that, a buildbot slave.  I'm slowly working my
> way through various issues that keep the buildbot from working properly
> (most recently, I had to switch to aufs from overlayfs, still need to file
> a bug for that).
> Now the problem is that inside the container, even though there is lots of
> disk space shown via df, I'm getting "no space left on device"
> after running "make check" for the project I'm building.

Did you check that you aren't running out of inodes? The error message
would be identical (check with df -i).

> The virtualbox has 2GB ram and 22GB disk space free.
> I can trigger the error by running just a little bit of "make check",
> but if I try stracing that, the problem doesn't seem to happen.
> The other strange thing is that I'm seeing leftover ephemeralbind mounts,
> even though the log from lxc-start-ephemeral clearly shows the umount statement.

Hopefully these no longer exist with the python + lxc-hooks port as
everything is mounted in the container's mount namespace which is killed
on shutdown.

> Both problems are triggered by running the testcase.
> 
> Next step: switch to vmware and hope this all goes away.
> If it doesn't, then maybe I start looking at that overlayfs bug...
> 
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-- 
Stéphane Graber
Ubuntu developer
http://www.ubuntu.com

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