GNU bug report logs - #47094
27.1; emacs dies with XBM display

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Message #16 received at 47094 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Alan Third <alan <at> idiocy.org>
Cc: ynyaaa <at> gmail.com, 47094 <at> debbugs.gnu.org
Subject: Re: bug#47094: 27.1; emacs dies with XBM display
Date: Sat, 13 Mar 2021 09:19:17 +0200

> Date: Fri, 12 Mar 2021 22:08:10 +0000
> From: Alan Third <alan <at> idiocy.org>
> 
> > > (let* ((w 256)
> > >        (h 256)
> > >        (s (make-string (* (/ w 8) h) #x55)))
> > >   (insert-image (create-image s 'xbm t :width w :height h)))
> > 
> > I can reproduce in Emacs 27, but not on the current master branch.  So
> > I guess this has been fixed already, and I'm closing the bug.
> 
> I can reproduce on the master branch. It looks like a stack overflow
> in xbm_read_bitmap_data.

I did indeed get an infinite recursion on the emacs-27 branch, but not
on master.

> I tried it in a debugger, but the backtrace looks truncated.

Before or after SIGSEGV?  If it's after, then it isn't surprising you
get a truncated backtrace.

I think if you see the infinite recursion we should understand why it
happens in the first place, and try to prevent it.

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