bug#12251: 24.2.50; crash in note_mouse_highlight

[Sam Steingold <sds@gnu.org>]

> * Eli Zaretskii <ryvm@tah.bet> [2012-08-21 21:42:14 +0300]:
>
>> #8  0x00000000004f5da5 in cmd_error_internal (data=68832822, context=0x7fffffffcf30 "")
>>     at /home/sds/src/emacs/trunk/src/keyboard.c:1147
>> #9 0x00000000004f5f23 in cmd_error (data=68832822) at
>> /home/sds/src/emacs/trunk/src/keyboard.c:1080
>
> what error are we trying to process here?  What is 'data' in frame #8?

how do I figure that out?

$ gdb -x ~/src/emacs/trunk/build/src/.gdbinit ~/src/emacs/trunk/build/src/emacs core.7393 
GNU gdb (Ubuntu/Linaro 7.4-2012.04-0ubuntu2) 7.4-2012.04
Reading symbols from /home/sds/src/emacs/trunk/build/src/emacs...done.
[New LWP 7397]
[New LWP 7396]
[New LWP 7393]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `emacs'.
Program terminated with signal 11, Segmentation fault.
#0  0x00007ffff3eb5b03 in poll () from /lib/x86_64-linux-gnu/libc.so.6
Warning: /home/sds/../lwlib: No such file or directory.
SIGINT is used by the debugger.
Are you sure you want to change it? (y or n) [answered Y; input not from terminal]
DISPLAY = :0
TERM = screen
Breakpoint 1 at 0x4f0aa0: abort. (2 locations)
Temporary breakpoint 2 at 0x50c7a0: file /home/sds/src/emacs/trunk/src/sysdep.c, line 849.
(gdb) f 8
#0  0x0000000000000000 in ?? ()
(gdb) whee
Undefined command: "whee".  Try "help".
(gdb) where
#0  0x00007ffff3eb5b03 in poll () from /lib/x86_64-linux-gnu/libc.so.6
#1  0x00007ffff4962036 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007ffff496249a in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007ffff4f27406 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#4  0x00007ffff49839e5 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007ffff5736e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#6  0x00007ffff3ec14bd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#7  0x0000000000000000 in ?? ()
(gdb) 


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Sam Steingold (http://sds.podval.org/) on Ubuntu 12.04 (precise) X 11.0.11103000
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