bug#72166: Shepherd periodically goes unresponsive on one of my machines

["Ludovic Courtès" <ludo@gnu.org>]

Hi Jonathan,

"Jonathan Frederickson" <jonathan@terracrypt.net> skribis:

> I've been running into an issue with Shepherd on one of my machines. Every so often (and I haven't figured out what conditions trigger it), my Shepherd instances (both home and PID 1) will go unresponsive. I thought I had tracked it down to a misbehaving home service that I had configured, but it's just happened again without that service running.
>
> 'herd status' hangs indefinitely:
>
> jfred@terracard ~$ sudo herd status
> Password: 
> <never returns>
>
> ...on both instances:
>
> jfred@terracard ~$ herd status
> <never returns>

Ouch.  What version of shepherd is running?  (You can view it with
“cat /proc/1/cmdline | xargs -0”.)

> The PID 1 shepherd instance isn't reaping defunct processes:
>
> jfred@terracard ~$ ps aux | grep -i lock
> jfred      541  0.0  0.0   3700  2304 ?        S    18:30   0:00 swayidle -w timeout 300 swaylock -f -i ~/.wallpapers/user-manual.jpg timeout 10 if pgrep swaylock; then swaymsg "output * dpms off"; fi resume swaymsg "output * dpms on" before-sleep swaylock -f -i ~/.wallpapers/user-manual.jpg
> jfred     3111  0.0  0.0      0     0 ?        Z    18:53   0:00 [swaylock] <defunct>
> jfred     3112  0.0  0.0      0     0 ?        Zs   18:53   0:00 [swaylock] <defunct>
>
> Some further troubleshooting... strace indicates that it's waiting on a read() on its fd 9:

Interesting.  There were bugs in earlier 0.10.x version that could cause
this sort of thing; let’s see what version you have, first.

Ludo’.