[Buildbot-devel] Master shutting down when slave detaches?

Dan Kegel dank at kegel.com
Thu Dec 27 17:30:18 UTC 2012

On Thu, Dec 27, 2012 at 6:59 AM, Dustin J. Mitchell <dustin at v.igoro.us> wrote:
> Is there some kernel-level debugging tool that could tell you about
> who's sending signals?  That's pretty weird..

I used systemtap to monitor who was sending the signal:
  wget http://kegel.com/linux/ubuntu-debugging-kernel.sh.txt
  sh ubuntu-debugging-kernel.sh.txt
  sudo apt-get install systemtap
  wget http://sourceware.org/systemtap/examples/process/sigmon.stp
  ps augxw | grep twistd
  sudo stap -x 5314 sigmon.stp SIGTERM
then triggered a build.  And the culprit was...
SPID     SNAME            RPID  RNAME            SIGNUM SIGNAME
1        init             5314  twistd           15     SIGTERM
... init, just as you suspected earlier.

Why would upstart do that?   Well, to get it to start automatically, I had

start on (started network-interface or started network-manager or
started networking)
stop on (stopping network-interface or stopping network-manager or
stopping networking)

And lxc certainly is starting and stopping network interfaces.

So I guess I have to be more careful where I point that gun.

Thanks for the nudge!
- Dan

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