[lxc-devel] console patch

[Stéphane Graber]

On Fri, Mar 07, 2014 at 11:14:56AM -0500, Dwight Engen wrote:
> On Thu, 6 Mar 2014 16:54:51 -0600
> Serge Hallyn <serge.hallyn at ubuntu.com> wrote:
> 
> > Hi Dwight,
> > 
> > commit 1da0ad1, 'fix console stdin,stdout,stderr fds', seems to have
> > regressed 'lxc-test-concurrent -j 20 -i 10'.  Containers sometimes
> > fail to start when dup2 fails with ebadf.  I can't see any reason
> > why it would have done so though.  Do you have any idea?
> 
> Hmm, no I'm not sure why that would happen. I'll try to reproduce and
> look into it.

If that helps track down the issue, I just noticed that your patch was
also causing some failures with lxc-autostart, at least for unprivileged
containers:
stgraber at castiana:~$ lxc-autostart -g teams
  lxc_container 1394209391.187 ERROR    lxc_console - Bad file descriptor - failed to dup console
  lxc_container 1394209391.187 ERROR    lxc_sync - sync wake failure : Bad file descriptor
  lxc_container 1394209391.899 ERROR    lxc_console - Bad file descriptor - failed to dup console
  lxc_container 1394209391.899 ERROR    lxc_sync - sync wake failure : Bad file descriptor
  lxc_container 1394209392.583 ERROR    lxc_console - Bad file descriptor - failed to dup console
  lxc_container 1394209392.583 ERROR    lxc_sync - sync wake failure : Bad file descriptor

The above is with 3 unprivileged auto-started containers (in lxc.group
teams) with the first declaring:
  lxc.loglevel = debug
  lxc.logfile = /dev/stdout

To make debugging possible. Without those two statements, lxc-autostart
simply silently fails to start them.

-- 
Stéphane Graber
Ubuntu developer
http://www.ubuntu.com
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