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bug#4970: 23.1; Emacs Gtk running nuts


From: Jan Djärv
Subject: bug#4970: 23.1; Emacs Gtk running nuts
Date: Fri, 20 Nov 2009 09:31:07 +0100
User-agent: Thunderbird 2.0.0.23 (X11/20090817)

Dan Nicolaescu skrev:
Werner Fink <address@hidden> writes:

  > A user runs "emacs -nw" within xterm, and often stop them with CTRL-Z to
  > keep them in background. Now Emacs loops and hogs both memory and cpu after
  > shutting down X11 going to runlevel 3. Likely this was a leftover emacs from
  > background.
> > From top: > > PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND > 23902 xxxxxx 20 0 7222m 3.4g 608 R 100 88.9 59:28.72 emacs-gtk

I have seen this in the past, but only with the info above I was able to
find a reliable way to reproduce this.
It also happens with the lucid toolkit, so it's not related to gtk.


Xnest :1&
xterm -display :1

Now in that xterm window in Xnest do:
emacs -Q -nw
C-z

kill the Xnest window

and watch the emacs process grow in size.


What happens is that reading from the terminal fails and Emacs tries to remove that terminal, but in term.c:

  if (last_terminal)
      error ("Attempt to delete the sole terminal device with live frames");


which goes back to the command loop, tries to read agan, fails, and tries to delete the terminal again, and so on.

If you remove this check, Emacs exits. But I suppose it is there for a reason, but I don't know what. Anybody?

        Jan D.

pstack shows it's doing things like this:

#0  0xb72d76cb in brk () from /lib/tls/libc.so.6
#1  0xb72d773f in sbrk () from /lib/tls/libc.so.6
#2  0xb7277711 in __default_morecore () from /lib/tls/libc.so.6
#3  0xb72760fb in sYSMALLOc () from /lib/tls/libc.so.6
#4  0xb72730fd in malloc () from /lib/tls/libc.so.6
#5  0x08136bf3 in lisp_align_malloc (nbytes=1020, type=MEM_TYPE_CONS)
#6  0x081379de in Fcons (car=138006754, cdr=139399917)
#7  0x0814e076 in specbind (symbol=138141378, value=138006802)
#8  0x081106a5 in signal_after_change (charpos=42, lendel=0, lenins=1)
#9  0x0810e4e5 in insert (string=0xbfffce60 ";", nbytes=1)
#10 0x0810e61d in insert_char (c=101)
#11 0x08161295 in strout (
#12 0x0816161a in print_string (string=2103883921, printcharfun=138006802)
#13 0x08165a59 in print_object (obj=2103883921, printcharfun=138006802, #14 0x081632a5 in Fprinc (object=2103883921, printcharfun=138006802) #15 0x08163ba6 in print_error_message (data=2103870030, stream=138006802, #16 0x080ee37e in cmd_error_internal (data=2103870030, context=0xbfffd2a0 "")
#17 0x080ee226 in cmd_error (data=2103870030)
#18 0x0814bcd3 in internal_condition_case (bfun=0x80ee6b0 <command_loop_1>, #19 0x080ee452 in command_loop_2 () #20 0x0814b88f in internal_catch (tag=138041786, #21 0x080ee3e0 in command_loop ()
#22 0x080eddfc in recursive_edit_1 ()
#23 0x080edf38 in Frecursive_edit ()
#24 0x080ecc70 in main (argc=3, argv=0xbfffd854)

Unfortunately I can't investigate more now.








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