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Re: editfns.c (Fformat): fix for segfault
From: |
Jim Meyering |
Subject: |
Re: editfns.c (Fformat): fix for segfault |
Date: |
Wed, 07 May 2003 11:27:23 +0200 |
Richard Stallman <address@hidden> wrote:
> I applied that patch and rebuilt yesterday.
> It just aborted:
>
> Program received signal SIGABRT, Aborted.
> 0x402e2a41 in kill () from /lib/libc.so.6
> (gdb) w
> #0 0x402e2a41 in kill () from /lib/libc.so.6
> #1 0x080fef29 in abort () at /mirror/d/emacs/src/emacs.c:412
> #2 0x0815f2bd in Fgarbage_collect () at /mirror/d/emacs/src/alloc.c:4103
> #3 0x08179c26 in Ffuncall (nargs=3, args=0xbfffd8e0)
> at /mirror/d/emacs/src/eval.c:2664
> #4 0x08179a2e in run_hook_list_with_args (funlist=1492461932, nargs=3,
> args=0xbfffd8e0) at /mirror/d/emacs/src/eval.c:2446
> #5 0x0812aeac in signal_before_change (start_int=1, end_int=11,
> preserve_ptr=0xbfffd9e0) at /mirror/d/emacs/src/insdel.c:2058
>
> Binding Qinhibit_modification_hooks to t should have made
> signal_before_change return near the beginning. Can you find
> out why this did not work?
I set a watchpoint for inhibit_modification_hooks, and found that
it changes very frequently. Is that expected?
In fact, it changes so frequently, that attaching a useful action
(like `where' or xbacktrace) to it makes emacs+Gnus nearly unusable.
I presume the goal is to find out which code sets it to 0
just before the abort.
I could endure that if there were some way to trigger the abort
more quickly. I can't use such an impaired program for the entire
day or so it usually seems to take.
For example, after stopping at a breakpoint in Fgarbage_collect,
I enabled the inhibit_modification_hooks watchpoint and `finish'ed
that function. The watchpoint was hit *many* times:
Hardware watchpoint 5: inhibit_modification_hooks
Old value = 1
New value = 0
store_symval_forwarding (symbol=406073020, valcontents=674503112,
newval=405897284, buf=0x8578e28) at /mirror/d/emacs/src/data.c:889
889 break;
(gdb) w
#0 store_symval_forwarding (symbol=406073020, valcontents=674503112,
newval=405897284, buf=0x8578e28) at /mirror/d/emacs/src/data.c:889
#1 0x081645ab in set_internal (symbol=406073020, newval=405897284,
buf=0x8578e28, bindflag=1) at /mirror/d/emacs/src/data.c:1243
#2 0x0817ad54 in unbind_to (count=2, value=405897284)
at /mirror/d/emacs/src/eval.c:3106
#3 0x080705c0 in with_echo_area_buffer (w=0x0, which=0,
fn=0x8071296 <current_message_1>, a1=-1073747996, a2=405897284, a3=0,
a4=0)
at /mirror/d/emacs/src/xdisp.c:6809
#4 0x08071279 in current_message () at /mirror/d/emacs/src/xdisp.c:7227
#5 0x080712ef in push_message () at /mirror/d/emacs/src/xdisp.c:7262
#6 0x0815f2f3 in Fgarbage_collect () at /mirror/d/emacs/src/alloc.c:4117
#7 0x0810510d in read_char (commandflag=1, nmaps=8, maps=0xbfffeaf0,
prev_event=405897284, used_mouse_menu=0xbfffebdc)
at /mirror/d/emacs/src/keyboard.c:2717
#8 0x0810e1a0 in read_key_sequence (keybuf=0xbfffed50, bufsize=30,
prompt=405897284, dont_downcase_last=0, can_return_switch_frame=1,
fix_current_buffer=1) at /mirror/d/emacs/src/keyboard.c:8581
#9 0x0810242b in command_loop_1 () at /mirror/d/emacs/src/keyboard.c:1507
#10 0x08177cd8 in internal_condition_case (bfun=0x810209a <command_loop_1>,
handlers=405993916, hfun=0x8101c37 <cmd_error>)
at /mirror/d/emacs/src/eval.c:1333
#11 0x08101f5e in command_loop_2 () at /mirror/d/emacs/src/keyboard.c:1295
#12 0x08177789 in internal_catch (tag=405955220,
func=0x8101f3f <command_loop_2>, arg=405897284)
at /mirror/d/emacs/src/eval.c:1094
#13 0x08101f11 in command_loop () at /mirror/d/emacs/src/keyboard.c:1274
#14 0x081019de in recursive_edit_1 () at /mirror/d/emacs/src/keyboard.c:990
#15 0x08101b0d in Frecursive_edit () at /mirror/d/emacs/src/keyboard.c:1046
#16 0x08100505 in main (argc=3, argv=0xbffff364)
at /mirror/d/emacs/src/emacs.c:1659