On 08/13/2012 11:24 PM, Eli Zaretskii wrote:

> Perhaps related, the current trunk (revision 109586) segfaults on
> startup ("emacs -Q") on GNU/Linux, with the following backtrace:

Eli, please review a fix.

This looks simple: it's wrong to look at with f->output_data.XXX without
checking f->output_method first, so, FRAME_X_OUTPUT (f) may be non-zero
for TTY frames, and segfault comes when xg_mark_data looks at initial
("F1") frame with non-zero f->output_data.tty member.

Dmitry