From: Dima Kogan <dima@secretsauce.net>
To: Eli Zaretskii <eliz@gnu.org>
Cc: 21556@debbugs.gnu.org
Subject: bug#21556: 25.0.50; Memory leak in emacs -Q with lucid (font)
Date: Fri, 25 Sep 2015 01:13:15 -0700 [thread overview]
Message-ID: <871tdmex2c.fsf@secretsauce.net> (raw)
In-Reply-To: <83k2rfhu93.fsf@gnu.org>
Eli Zaretskii <eliz@gnu.org> writes:
>> From: Dima Kogan <dima@secretsauce.net>
>> Date: Thu, 24 Sep 2015 17:05:12 -0700
>>
>> Main question of this bug report so far:
>>
>> Is there a way to put a watchpoint on a lisp object?
>
> Theoretically, yes.
Hi. I just came back to this, figured out how to (semi-manually) put in
a watchpoint, and this watchpoint told me what's resetting the font
cache: the garbage collector. The backtrace in question:
0x00000000005d2172 in compact_font_cache_entry (entry=24121763) at alloc.c:5313
#0 0x00000000005d2172 in compact_font_cache_entry (entry=24121763) at alloc.c:5313
#1 0x00000000005d221b in compact_font_caches () at alloc.c:5339
#2 0x00000000005d2742 in garbage_collect_1 (end=0x7ffcdb166830) at alloc.c:5515
#3 0x00000000005d2e1d in Fgarbage_collect () at alloc.c:5720
#4 0x000000000054eb21 in maybe_gc () at lisp.h:4515
#5 0x00000000005f638c in Ffuncall (nargs=3, args=0x7ffcdb166988) at eval.c:2584
Lisp Backtrace:
"Automatic GC" (0x0)
"map-keymap" (0xdb166990)
"keymap-canonicalize" (0xdb166f38)
"x-create-frame" (0xdb1678a0)
"x-create-frame-with-faces" (0xdb167dd8)
0x12b9d80 PVEC_COMPILED
"apply" (0xdb168450)
"frame-creation-function" (0xdb1689f0)
"make-frame" (0xdb168f40)
"make-frame-on-display" (0xdb1694a8)
"server-create-window-system-frame" (0xdb169a78)
"server-process-filter" (0xdb169ff8)
Hardware watchpoint 24: ((struct Lisp_Cons *) 0x1701190)->u.cdr
As a test I asked gdb to never drop fonts in the gc by acting as if
drop==0 in compact_font_cache_entry(), and that made the leak in this
bug go away. Clearly that's not a fix, but it's evidence that the
understanding of the problem is correct, so progress is being made.
next prev parent reply other threads:[~2015-09-25 8:13 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-25 0:05 bug#21556: 25.0.50; Memory leak in emacs -Q with lucid (font) Dima Kogan
2015-09-25 6:45 ` Eli Zaretskii
2015-09-25 6:57 ` Dima Kogan
2015-09-25 8:44 ` Eli Zaretskii
2015-09-25 8:13 ` Dima Kogan [this message]
2015-09-25 8:49 ` Eli Zaretskii
2015-09-25 9:10 ` Eli Zaretskii
2015-09-25 9:30 ` Dima Kogan
2015-09-25 9:45 ` Eli Zaretskii
2015-09-25 10:03 ` Eli Zaretskii
[not found] ` <83y4ftfbjw.fsf@gnu.org>
2015-09-27 7:56 ` K. Handa
2015-09-27 8:09 ` Eli Zaretskii
2015-09-28 9:22 ` Dima Kogan
2015-09-28 9:58 ` Eli Zaretskii
2015-09-29 9:28 ` Dima Kogan
2015-09-30 7:00 ` Eli Zaretskii
2015-09-30 10:16 ` Dmitry Antipov
2015-10-01 9:42 ` Dima Kogan
2015-10-01 13:27 ` Dmitry Antipov
2015-10-01 18:50 ` Dima Kogan
2015-10-02 5:04 ` Dmitry Antipov
2015-10-02 18:56 ` Dima Kogan
2015-10-29 22:51 ` Dima Kogan
2015-10-30 14:20 ` Eli Zaretskii
2015-10-30 19:17 ` Dima Kogan
2015-10-30 20:38 ` Eli Zaretskii
2015-10-30 20:50 ` Dima Kogan
2015-11-09 2:55 ` Dima Kogan
2015-11-09 16:38 ` Eli Zaretskii
2019-11-17 6:34 ` Lars Ingebrigtsen
2019-11-17 15:38 ` Eli Zaretskii
2019-11-17 21:27 ` Dima Kogan
2019-11-18 8:13 ` Lars Ingebrigtsen
2015-09-29 10:05 ` K. Handa
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