Comment 52 for bug 1861359

There is an interesting (to me, anyway) change of behaviour with the -17 kernel: while earlier kernels would appear to be locked solid for 30-60 seconds before the screen could update, -17 allows screen updates every six seconds or so.

I have an always-running mosh session to a remote host running irssi. This session has a clock that updates every second. When this problem strikes I can glance at this clock and by watching the time jumps, gauge how long the hangs are.

When the -17 kernel hangs during these events, this clock updates roughly every six seconds:

eg on seconds 36, 42, 48, 54, 00, 06, 13, 19, 25, 31, 37, 43, 50, 56..

The system is by no means usable during this time, but it is interesting that enough userspace ran for mosh to accept packets and redraw the urxvt terminal, and xorg to update the screen.

My most recent hang happened while firefox loaded https://www.google.com/maps/place/20%C2%B054'35.7%22S+55%C2%B035'05.0%22E/@-20.9099167,55.5826253,2281m/data=!3m2!1e3!4b1!4m5!3m4!1s0x0:0x0!8m2!3d-20.90991!4d55.58471 but it might be the case that this is just what pushed my browser over the edge, after loading several pages of google docs content and a PDF.

Thanks