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bug#17561: Emacs can forget processes
From: |
Jorgen Schaefer |
Subject: |
bug#17561: Emacs can forget processes |
Date: |
Fri, 23 May 2014 18:44:19 +0200 |
On Fri, 23 May 2014 09:28:44 -0700
Paul Eggert <eggert@cs.ucla.edu> wrote:
> How was Emacs configured and built on your platform? What's your
> platform?
I have seen this bug happen on a Debian 7.5 Wheezy x86_64 with an
Emacs configured with --without-x and an openSUSE 12.3 amd64 with
a GUI version (can't currently check which toolkit it uses by default
there).
> Can you run the shell command 'strace -p' on an Emacs with the
> problem, and trace the system calls near the offending area?
The bug report includes an strace output. Emacs does the pselect6 call
and then read calls for all "broken" sockets in a tight loop, and
pretty much nothing else.
> Are you using anything involving SIGUSR1 or SIGUSR2? I see an
> unlikely race condition there.
Not to my knowledge, unless Emacs sends those signals in some situation
without it being obvious; I do not send any signals myself, all I do is
use `kill-buffer' and `delete-process'.
> That's part of the problem with this code: it's so racy that it seems
> that every time I look at it I find another unlikely race condition.
> I'm attaching a patch to emacs-24 for the unlikely races I found in a
> quick look at the area, not that I think it'll fix your problem. I
> haven't installed this.
read(2) returning 0 indicates an EOF (which pselect6 indicates as
waiting input), I suspect there could at least be a sanity check here
to close the file descriptors instead of continuously polling.
Regards,
Jorgen
- bug#17561: 24.4.50; Emacs can forget processes, Jorgen Schaefer, 2014/05/23
- bug#17561: Emacs can forget processes, Paul Eggert, 2014/05/23
- bug#17561: Emacs can forget processes,
Jorgen Schaefer <=
- bug#17561: Emacs can forget processes, Paul Eggert, 2014/05/24
- bug#17561: Emacs can forget processes, Jorgen Schaefer, 2014/05/25
- bug#17561: Emacs can forget processes, Paul Eggert, 2014/05/26
- bug#17561: Emacs can forget processes, Jorgen Schaefer, 2014/05/26
- bug#17561: Emacs can forget processes, Paul Eggert, 2014/05/26
- bug#17561: Emacs can forget processes, Jorgen Schaefer, 2014/05/27
- bug#17561: Emacs can forget processes, Paul Eggert, 2014/05/27
- bug#17561: Emacs can forget processes, Jorgen Schaefer, 2014/05/27
- bug#17561: Emacs can forget processes, Paul Eggert, 2014/05/27
- bug#17561: Emacs can forget processes, Jorgen Schaefer, 2014/05/28