[Trent W. Buck] Segfault: emacs -batch -Q -eval '(format-mode-line mode-line-format)'

[Sven Joachim]

I received the attached report via the Debian bug tracking system.
It is reproducible on the trunk as well as in EMACS_22_BASE, backtrace
in EMACS_22_BASE looking like this:

Program received signal SIGSEGV, Segmentation fault.
0x0806fb9b in decode_mode_spec_coding (coding_system=137604633, buf=0x0, 
eol_flag=0) at xdisp.c:17622
(gdb) backtrace
#0  0x0806fb9b in decode_mode_spec_coding (coding_system=137604633, buf=0x0, 
eol_flag=0) at xdisp.c:17622
#1  0x080772a3 in display_mode_element (it=0xbf86f554, depth=4, field_width=0, 
precision=-1, elt=137737323, props=137480393, risky=0) at xdisp.c:18043
#2  0x08077cde in display_mode_element (it=0xbf86f554, depth=3, field_width=0, 
precision=-1, elt=137925469, props=137480393, risky=0) at xdisp.c:17190
#3  0x08077cde in display_mode_element (it=0xbf86f554, depth=1, field_width=0, 
precision=0, elt=137923285, props=137480393, risky=0) at xdisp.c:17190
#4  0x0807b457 in Fformat_mode_line (format=137923269, face=137480393, 
window=137480393, buffer=137512260) at xdisp.c:17418
#5  0x08154fee in Feval (form=139449061) at eval.c:2326
#6  0x08155afc in Ffuncall (nargs=2, args=0xbf86f9d0) at eval.c:2985
#7  0x0817faac in Fbyte_code (bytestr=136611403, vector=136611420, 
maxdepth=<value optimized out>) at bytecode.c:679
#8  0x08155486 in funcall_lambda (fun=136611372, nargs=1, 
arg_vector=0xbf86fb24) at eval.c:3172
#9  0x08155890 in Ffuncall (nargs=2, args=0xbf86fb20) at eval.c:3042
#10 0x0817faac in Fbyte_code (bytestr=136602331, vector=136602348, 
maxdepth=<value optimized out>) at bytecode.c:679
#11 0x08155486 in funcall_lambda (fun=136602308, nargs=0, 
arg_vector=0xbf86fc64) at eval.c:3172
#12 0x08155890 in Ffuncall (nargs=1, args=0xbf86fc60) at eval.c:3042
#13 0x0817faac in Fbyte_code (bytestr=136599339, vector=136599356, 
maxdepth=<value optimized out>) at bytecode.c:679
#14 0x08155486 in funcall_lambda (fun=136599316, nargs=0, 
arg_vector=0xbf86fd30) at eval.c:3172
#15 0x08155680 in apply_lambda (fun=136599316, args=137480393, eval_flag=1) at 
eval.c:3096
#16 0x08154d44 in Feval (form=139177165) at eval.c:2376
#17 0x080f4e13 in top_level_2 () at keyboard.c:1339
#18 0x08154480 in internal_condition_case (bfun=0x80f4e00 <top_level_2>, 
handlers=137525897, hfun=0x80f8590 <cmd_error>) at eval.c:1483
#19 0x080f7980 in top_level_1 () at keyboard.c:1347
#20 0x0815455a in internal_catch (tag=137522081, func=0x80f7950 <top_level_1>, 
arg=137480393) at eval.c:1223
#21 0x080f83a9 in command_loop () at keyboard.c:1304
#22 0x080f876a in recursive_edit_1 () at keyboard.c:1007
#23 0x080f8856 in Frecursive_edit () at keyboard.c:1068
#24 0x080ee620 in main (argc=5, argv=0xbf8703e4) at emacs.c:1769

Lisp Backtrace:
"format-mode-line" (0x8388ac5)
"eval" (0x84fd2e5)
"command-line-1" (0x84b8375)
"command-line" (0x8572363)
"normal-top-level" (0x831c8c9)
(gdb) 


> --- Begin Message ---
>
>
>
> Subject: 
>
> Bug#447087: Segfault: emacs -batch -Q -eval '(format-mode-line mode-line-format)'
>
>
>
>
> Date: 
>
> Thu, 18 Oct 2007 10:57:36 +1000
>
>
>
>
> Package: emacs22
> Version: 22.1+1-2
> Severity: normal
> File: /usr/bin/emacs22
>
> I don't think this is supposed to happen:
>
> $ emacs -Q -eval '(format-mode-line mode-line-format)' -f kill-emacs
> $ emacs -batch -Q -eval '(format-mode-line mode-line-format)'
> Fatal error (11)Segmentation fault
> $
>
> -- System Information:
> Debian Release: lenny/sid
>   APT prefers unstable
>   APT policy: (990, 'unstable')
> Architecture: amd64 (x86_64)
>
> Kernel: Linux 2.6.22-2-amd64 (SMP w/1 CPU core)
> Locale: LANG=en_AU.utf8, LC_CTYPE=en_AU.utf8 (charmap=UTF-8)
> Shell: /bin/sh linked to /bin/dash
>
> Versions of packages emacs22 depends on:
> ii  emacs22-bin-common      22.1+1-2         The GNU Emacs editor's shared, arc
> ii  libc6                   2.6.1-5          GNU C Library: Shared libraries
> ii  libice6                 2:1.0.4-1        X11 Inter-Client Exchange library
> ii  libjpeg62               6b-14            The Independent JPEG Group's JPEG 
> ii  libncurses5             5.6+20071006-3   Shared libraries for terminal hand
> ii  libpng12-0              1.2.15~beta5-3   PNG library - runtime
> ii  libsm6                  2:1.0.3-1+b1     X11 Session Management library
> ii  libtiff4                3.8.2-7          Tag Image File Format (TIFF) libra
> ii  libungif4g              4.1.4-5+b1       shared library for GIF images
> ii  libx11-6                2:1.0.3-7        X11 client-side library
> ii  libxext6                1:1.0.3-2        X11 miscellaneous extension librar
> ii  libxmu6                 1:1.0.3-1        X11 miscellaneous utility library
> ii  libxpm4                 1:3.5.7-1        X11 pixmap library
> ii  libxt6                  1:1.0.5-3        X11 toolkit intrinsics library
> ii  xaw3dg                  1.5+E-15         Xaw3d widget set
> ii  zlib1g                  1:1.2.3.3.dfsg-6 compression library - runtime
>
> emacs22 recommends no packages.
>
> -- no debconf information
>
>
>
>
> --- End Message ---