Killing build jobs - mock python processes survive

[Michael Schwendt]

On Thu, 31 Jan 2008 15:30:19 -0500, Mike McLean wrote:

> > Does that work successfully in koji?  Here, the mock Python processes
> > survive the kill signal. Only the parent mock process terminates. The
> > other ones keep building until the job succeeds or fails.
> 
> Koji is pretty aggressive about killing off task processes.
> 
> https://hosted.fedoraproject.org/koji/browser/builder/kojid#L863

Hmmm... but is it successful?

It finds more child process groups and kills them, but here it doesn't
kill all of mock's processes either.

To take a closer look I've ported the code into Plague (on F8). Below is
one snapshot of the /proc stats of the build processes. The code finds
process groups 16216 and 16220. After sending SIGTERM (or SIGKILL, doesn't
matter) to pgrp -16216, pid 16216 is reported as killed, but pid 16219 is
still running. Another waitpid on the pgrp gives "[Errno 10] No child
processes".

[16216, '(mock)', 'S', 16068, 16216, 2532, 34816, 16068, 4194560, 289, 0, 0, 0, 0, 0, 0, 0, 20, 0, 1, 0, 603929, 1642496, 48, 4294967295L, 134512640, 134516316, 3216708864L, 3216708516L, 1115138, 0, 0, 553652224, 0, 3225615909L, 0, 0, 17, 0, 0, 0, 0]
[16219, '(python)', 'S', 16216, 16216, 2532, 34816, 16068, 4202752, 2067, 0, 0, 0, 41, 6, 0, 0, 20, 0, 1, 0, 603934, 13672448, 1764, 4294967295L, 134512640, 134514536, 3214952352L, 3214940384L, 1115138, 0, 0, 553652224, 8194, 0, 0, 0, 17, 0, 0, 0, 1]

[16220, '(python)', 'S', 16219, 16220, 2532, 34816, 16068, 4202560, 343, 0, 0, 0, 0, 0, 0, 0, 20, 0, 1, 0, 603993, 13676544, 1109, 4294967295L, 134512640, 134514536, 3214952352L, 3214940384L, 1115138, 0, 0, 553652224, 2, 0, 0, 0, 17, 0, 0, 0, 0]
[16221, '(tar)', 'S', 16220, 16220, 2532, 34816, 16068, 4194560, 891, 0, 0, 0, 80, 546, 0, 0, 20, 0, 1, 0, 603993, 2551808, 281, 4294967295L, 134508544, 134772428, 3217980208L, 3217979524L, 1115138, 0, 0, 553652224, 0, 0, 0, 0, 17, 0, 0, 0, 739]
[16222, '(gzip)', 'D', 16221, 16220, 2532, 34816, 16068, 4194304, 167, 0, 0, 0, 650, 174, 0, 0, 20, 0, 1, 0, 603996, 2162688, 117, 4294967295L, 134508544, 134566708, 3220637264L, 3220635252L, 1115138, 0, 0, 553652224, 8404995, 0, 0, 0, 17, 0, 0, 0, 25]