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bug#4970: 23.1; Emacs Gtk running nuts

From: Dan Nicolaescu
Subject: bug#4970: 23.1; Emacs Gtk running nuts
Date: Thu, 19 Nov 2009 11:56:58 -0800 (PST)

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

kill the Xnest window

and watch the emacs process grow in size.

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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