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bug#29843: 25.3; Emacs crash when running emacsclient
From: |
Eli Zaretskii |
Subject: |
bug#29843: 25.3; Emacs crash when running emacsclient |
Date: |
Mon, 25 Dec 2017 18:03:41 +0200 |
> From: Mike Kupfer <mkupfer@alum.berkeley.edu>
> Date: Sun, 24 Dec 2017 12:29:06 -0800
>
> I ran "emacsclient -c" to get a new Emacs frame on a system running MATE
> on Debian 9. IIRC, a new frame appeared for a split second and then
> disappeared. (I'm afraid the crash happened a few days ago and I'm just
> now getting to filing the bug report.) I found a core file; gdb says
> there was a segmentation fault. This is the first and only time I've
> seen such a crash.
>
> I'll hold onto the core file for a couple weeks in case there is
> additional information to extract from it.
>
> (gdb) bt full
> #0 0x00007f0441b83f9f in raise () from /lib/x86_64-linux-gnu/libpthread.so.0
> No symbol table info available.
> #1 0x00000000004d99d1 in terminate_due_to_signal (sig=sig@entry=11,
> backtrace_limit=backtrace_limit@entry=40) at emacs.c:381
> No locals.
> #2 0x00000000004f14ce in handle_fatal_signal (sig=sig@entry=11)
> at sysdep.c:1601
> No locals.
> #3 0x00000000004f16d9 in deliver_thread_signal (sig=sig@entry=11,
> handler=0x4f14c0 <handle_fatal_signal>) at sysdep.c:1575
> No locals.
> #4 0x00000000004f173f in deliver_fatal_thread_signal (sig=11) at
> sysdep.c:1613
> No locals.
> #5 handle_sigsegv (sig=11, siginfo=<optimized out>, arg=<optimized out>)
> at sysdep.c:1695
> fatal = <optimized out>
> #6 <signal handler called>
> No symbol table info available.
> #7 reconsider_clip_changes (w=w@entry=0x3764378) at xdisp.c:13452
This segfault is here:
static void
reconsider_clip_changes (struct window *w)
{
struct buffer *b = XBUFFER (w->contents);
if (b->clip_changed
&& w->window_end_valid
&& w->current_matrix->buffer == b
&& w->current_matrix->zv == BUF_ZV (b)
&& w->current_matrix->begv == BUF_BEGV (b)) <<<<<<<<<<<<<<<<<<
b->clip_changed = false;
So either w or b is a NULL or garbled pointer. Can you tell which
one? (Let me know if you need help with GDB commands to do that.)
Thanks.