unresponsive process issue

[Konstantin Schukraft]

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Hi,

On 03/10/2016 01:32, Travis Parker wrote:
> I've twice now had a process get into a stuck state that I don't
> believe should be possible: stopped (ps reports 'T', top reports
> 'STOP'), but unresponsive to any signal, including even CONT (KILL
> followed by CONT isn't clearing it). It's a redis process, in a
> jail, that is listening on a streaming unix domain socket.
I see the same thing happening here with long running processes in
jails. In my case it's firefox and thunderbird. At first I thought
it's yet another firefox bug that somehow creeped into the thunderbird
codebase (I don't know how disjunct those are). When it happens, they
completely stop responding to signals (including a kill -9) and their
graphical UI stops responding at least partly. E.g. I sometimes can
still select other tabs in firefox, but it only updates the window
title, not the actual content.

> For the moment I have switched it over to TCP on localhost and I'll
> have to wait and see if that works around whatever got it into this
> state (it takes a few days to occur).
I can confirm this timescale of a few days.

> I wanted to reach out to this list in case there's something
> obvious I'm missing before mailing freebsd-bugs. I've found a few
> descriptions of a similar issue (STOP state unresponsive to CONT)
> from googling, but only back around 2004 and always resolved.
Since we seem to have the same core problem, please send that bug
report. I can at least corroborate your findings, if nothing else.


All the best,

Konstantin
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