GNU bug report logs - #29170
Emacs freezes when doing a gui-get-selection on OpenBSD

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From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: daimrod <at> omecha.info
Cc: Eli Zaretskii <eliz <at> gnu.org>, 29170 <at> debbugs.gnu.org
Subject: bug#29170: 26.0.90; Emacs freezes when capturing an org-template
Date: Sat, 03 Oct 2020 19:51:13 +0200

daimrod <at> omecha.info writes:

>> If this is an OpenBSD-only problem, maybe we should install that
>> change #ifdef'ed by OpenBSD?

Yes, but as noted by others in the thread, the patch leads to other
issues on OpenBSD, too, so it's not a complete solution.

> I'll have to test it, but I've been told that the issue doesn't occur
> when the "junk" is disabled in the memory allocator (j = 0).
>
> See MALLOC OPTIONS in malloc(3) https://man.openbsd.org/malloc
>
> j       “Less junking”.  Decrease the junk level by one if it is larger
>         than 0.  Junking writes some junk bytes into the area allocated.
>         Junk is bytes of 0xdb when allocating; freed chunks are filled
>         with 0xdf.  By default the junk level is 1: after free, small
>         chunks are completely junked; for pages the first part is junked.
>         After a delay, the filling pattern is validated and the process
>         is aborted if the pattern was modified.  For junk level 2,
>         junking is done on allocation as well and without size
>         restrictions.  If the junk level is zero, no junking is
>         performed.

Huh.  How odd that this would have an affect on this infloop?

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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