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bug#23259: 25.1.50; Xerror: "BadLength" on extreme zoom causing emacs to
bug#23259: 25.1.50; Xerror: "BadLength" on extreme zoom causing emacs to segfault
Sun, 10 Apr 2016 18:01:56 +0300
> From: Matthew Leach <address@hidden>
> Date: Sun, 10 Apr 2016 11:49:12 +0100
> emacs -Q
> open a file, emacs/src/process.c, say.
> C-x C-=
> and keep pressing
> Emacs will grind to a halt a little but will eventually segfault when
> the zoom is extreme enough.
> Attached is the backtrace. It looks as though X has thrown an error,
> maybe we need to limit the amount of zoom that Emacs allows?
Probably. However, the interesting question is: what values to use as
Also, this backtrace is not useful, since the X errors are by default
asynchronous. Could you please run Emacs in synchronous X mode (see
etc/DEBUG for how), and present the backtrace then? Also, please
. what is the maximum value of the scale factor you see on the mode
line before Emacs crashes
. what is the value returned by display-pixel-width
. what is the values returned by frame-char-width and
I'll try to prepare a patch using the above data.