unofficial mirror of bug-gnu-emacs@gnu.org 
 help / color / mirror / code / Atom feed
* bug#7951: 23.1; SIG_HUP handler infinite loop?
@ 2011-01-31 19:05 Alan Malloy
  2011-01-31 22:41 ` Glenn Morris
                   ` (2 more replies)
  0 siblings, 3 replies; 7+ messages in thread
From: Alan Malloy @ 2011-01-31 19:05 UTC (permalink / raw)
  To: 7951

[-- Attachment #1: Type: text/plain, Size: 4906 bytes --]

Steps to reproduce:

1. ssh into my machine from somewhere else

2. fire up emacs in terminal mode

3. suspend the emacs process with C-z

4. violently kill the ssh process on the other machine, so that it
doesn't send a clean logout

Symptoms:

The emacs process remains alive on my machine, quickly climbs to 100%
CPU usage, and gradually allocates more and more memory, apparently
stopping at 2GB. It doesn't respond to SIGINT (kill [pid]); I have to
send it a SIGKILL to get my machine back. If I strace the running
process, I get the following lines repeated forever:

gettimeofday({1296499016, 975065}, NULL) = 0
gettimeofday({1296499016, 975102}, NULL) = 0
gettimeofday({1296499016, 975128}, NULL) = 0
rt_sigprocmask(SIG_BLOCK, [IO], [HUP TERM IO], 8) = 0
ioctl(3, FIONREAD, [0]) = -1 EIO (Input/output error)
kill(1793, SIGHUP) = 0
ioctl(3, SNDCTL_TMR_TIMEBASE or TCGETS, 0xbfc0fba8) = -1 EIO 
(Input/output error)
ioctl(3, SNDCTL_TMR_TIMEBASE or TCGETS, 0xbfc0fb14) = -1 EIO 
(Input/output error)
ioctl(3, SNDCTL_TMR_STOP or TCSETSW, {B0 -opost -isig -icanon -echo 
...}) = -1 EIO (Input/output error)
write(3, "\7", 1) = -1 EIO (Input/output error)
gettimeofday({1296499016, 975503}, NULL) = 0
gettimeofday({1296499016, 975529}, NULL) = 0
gettimeofday({1296499016, 975555}, NULL) = 0
rt_sigprocmask(SIG_BLOCK, [IO], [HUP TERM IO], 8) = 0
ioctl(3, FIONREAD, [0]) = -1 EIO (Input/output error)
kill(1793, SIGHUP) = 0
ioctl(3, SNDCTL_TMR_TIMEBASE or TCGETS, 0xbfc0fba8) = -1 EIO 
(Input/output error)

FD 3 is /dev/tty, if that's relevant. In my limited experience, it
looks like something weird is happening in the SIGHUP handler,
possibly trying to send some data to the disconnected TTY and
repeating when that causes an error. But really I've no idea, so I'll
leave it at that and hope the strace is useful. I'd like to attach GDB
to get a stack trace, but I didn't install from source and it would be
kinda a hassle to switch unless someone tells me that will be useful.


In GNU Emacs 23.1.1 (i486-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
  of 2010-11-23 on rothera, modified by Debian
Windowing system distributor `The X.Org Foundation', version 11.0.10706000
configured using `configure  '--build=i486-linux-gnu' 
'--host=i486-linux-gnu' '--prefix=/usr' '--sharedstatedir=/var/lib' 
'--libexecdir=/usr/lib' '--localstatedir=/var/lib' 
'--infodir=/usr/share/info' '--mandir=/usr/share/man' '--with-pop=yes' 
'--enable-locallisppath=/etc/emacs23:/etc/emacs:/usr/local/share/emacs/23.1/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/23.1/site-lisp:/usr/share/emacs/site-lisp:/usr/share/emacs/23.1/leim' 
'--with-x=yes' '--with-x-toolkit=lucid' '--with-toolkit-scroll-bars' 
'build_alias=i486-linux-gnu' 'host_alias=i486-linux-gnu' 
'CFLAGS=-DDEBIAN -g -O2' 'LDFLAGS=-g' 'CPPFLAGS=''

Important settings:
   value of $LC_ALL: nil
   value of $LC_COLLATE: nil
   value of $LC_CTYPE: nil
   value of $LC_MESSAGES: nil
   value of $LC_MONETARY: nil
   value of $LC_NUMERIC: nil
   value of $LC_TIME: nil
   value of $LANG: en_US.UTF-8
   value of $XMODIFIERS: nil
   locale-coding-system: utf-8-unix
   default-enable-multibyte-characters: t

Major mode: Lisp Interaction

Minor modes in effect:
   global-auto-complete-mode: t
   auto-complete-mode: t
   delete-selection-mode: t
   tooltip-mode: t
   tool-bar-mode: t
   mouse-wheel-mode: t
   menu-bar-mode: t
   file-name-shadow-mode: t
   global-font-lock-mode: t
   font-lock-mode: t
   blink-cursor-mode: t
   global-auto-composition-mode: t
   auto-composition-mode: t
   auto-encryption-mode: t
   auto-compression-mode: t
   column-number-mode: t
   line-number-mode: t
   transient-mark-mode: t

Recent input:
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo>
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo>
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo>
<help-echo> <help-echo> <menu-bar> <help-menu> <about-emacs>
<help-echo> C-x k <return> <help-echo> <help-echo>
<help-echo> <help-echo> <help-echo> <help-echo> <menu-bar>
<help-menu> <send-emacs-bug-report>

Recent messages:
Loading /etc/emacs/site-start.d/50emacs-goodies-el.el (source)...done
Loading /etc/emacs/site-start.d/50git-core.el (source)...done
Loading /etc/emacs/site-start.d/50psvn.el (source)...done
Loading /etc/emacs/site-start.d/50slime.el (source)...
Loading /usr/share/emacs23/site-lisp/slime/slime-autoloads...done
Loading /etc/emacs/site-start.d/50slime.el (source)...done
Loading delsel...done
Loading /home/akm/.emacs.d/elpa/package.el (source)...done
Loading /home/akm/src/clojure/cdt/ide/emacs/cdt.el (source)...done
For information about GNU Emacs and the GNU system, type C-h C-a. [2 times]

-- 
------------------------------------------------------------------------
Alan Malloy
HubPages <www.hubpages.com> software engineer
415-273-9702
alan.malloy@yieldbuild.com <mailto:alan.malloy@yieldbuild.com>

[-- Attachment #2: Type: text/html, Size: 6440 bytes --]

^ permalink raw reply	[flat|nested] 7+ messages in thread
end of thread, other threads:[~2011-10-04  7:29 UTC | newest]

Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2011-01-31 19:05 bug#7951: 23.1; SIG_HUP handler infinite loop? Alan Malloy
2011-01-31 22:41 ` Glenn Morris
2011-01-31 22:46   ` Alan Malloy
2011-01-31 23:22     ` Glenn Morris
2011-08-29 14:36 ` bug#7951: SIG_HUP handler infinite loop Charles Hedrick
2011-10-04  7:23 ` bug#7951: Duplicate of #4970? era eriksson
2011-10-04  7:29   ` Glenn Morris

Code repositories for project(s) associated with this public inbox

	https://git.savannah.gnu.org/cgit/emacs.git

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).