[buildd-tools-devel] Bug#608054: Bug#608054: schroot: exiting session from one terminal kills others

[Roger Leigh]

On Sun, Dec 26, 2010 at 07:14:54PM +0100, Julien Cristau wrote:
> Package: schroot
> Version: 1.4.16-1
> Severity: important

If reproducible, this should probably be severity serious.

> when i run schroot from two terminals, exiting one kills the other.
> This seems to be a regression from earlier versions, and is bloody
> annoying.

I've had another report of this occuring (not sure if it was from
yourself), but I wasn't able to reproduce it at the time.

I assume this is due to the 15killprocs setup script?  If you
add an "exit 0" to the top of this script, does it still occur?

To better understand what's going on here, I really need some more
information about why this is happening, i.e. which commands you
run in each terminal and when.

Note that if you're running commands in the /same session/ on both
then ending the session will naturally kill all running processes
in that session; this is intended and expected.  If you're running
commands in /separate sessions/ and ending one kills the other,
then this is most certainly a major bug.

15killprocs works by looking at /proc/"$pid"/root in each process
under /proc, and it kills all those under the chroot mount location
(which should be specific to a schroot session).  If I run schroot
with "--vebose --debug=notice" I do see it try to kill the processes
in the other session now, which is really strange.  The mount
location is definitely different, but it's specifically killing
processes in the other session.  For reasons I'm not yet sure about
the SESSION_ID and CHROOT_MOUNT_LOCATION session names differ; it's
possibly picking up the other session details, but I find that
somewhat unbelievable.


Regards,
Roger

-- 
  .''`.  Roger Leigh
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