From: Andy Moreton <andrewjmoreton@gmail.com>
To: Eli Zaretskii <eliz@gnu.org>
Cc: 43700@debbugs.gnu.org
Subject: bug#43700: 28.0.50; Crash creating a second frame
Date: Sat, 3 Oct 2020 14:40:47 +0100 [thread overview]
Message-ID: <9902f5c5-ca88-4e70-a436-f8f471f723f7@gmail.com> (raw)
In-Reply-To: <83o8ljfpfg.fsf@gnu.org>
On 03/10/2020 13:45, Eli Zaretskii wrote:
>> Cc: 43700@debbugs.gnu.org
>> From: Andy Moreton <andrewjmoreton@gmail.com>
>> Date: Sat, 3 Oct 2020 13:26:09 +0100
>>
>>> (gdb) watch -l f->face_cache->used if f->face_cache->used == 0
>>>
>>> Then produce a backtrace from any time this watchpoint fires. That
>>> should show us the culprit.
>>
>> The watchpoint does not fire before the segfault, so there is clearly
>> something wrong with gdb on this platform :-(
>
> Does the watchpoint fire if you remove the condition? IOW, do this:
>
> (gdb) watch -l f->face_cache->used
>
> If this works, then you should see also the events where faces are
> added, which will show the 'used' count go up.
No - watchpoints seem to be completely broken in this build of gdb:
hardware watchpoints don't work, and if software watchpoints work then I
do not have the patience to wait for hours for them to fire.
> Another possibility is that the face cache gets reset not for the new
> frame being created, but for the other frame. You can tell by
> comparing the value of 'f' at the point where init_frame_faces is
> called and at the segfault point. If this is what happens, then we
> will need a slightly more sophisticated method of setting the
> watchpoint.
True, but not much use without working watchpoints.
AndyM
next prev parent reply other threads:[~2020-10-03 13:40 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-29 10:46 bug#43700: 28.0.50; Crash creating a second frame Andy Moreton
2020-09-29 14:37 ` Eli Zaretskii
2020-09-29 14:49 ` Andy Moreton
2020-09-30 20:06 ` Andy Moreton
2020-10-01 0:15 ` Andy Moreton
2020-10-01 12:53 ` Eli Zaretskii
2020-10-02 0:38 ` Andy Moreton
2020-10-02 11:49 ` Eli Zaretskii
2020-10-02 23:07 ` Andy Moreton
2020-10-03 8:16 ` Eli Zaretskii
2020-10-03 12:26 ` Andy Moreton
2020-10-03 12:45 ` Eli Zaretskii
2020-10-03 13:40 ` Andy Moreton [this message]
2020-10-03 14:02 ` Eli Zaretskii
2020-10-03 14:05 ` Andy Moreton
2020-10-03 14:32 ` Eli Zaretskii
2020-10-03 17:03 ` Andy Moreton
2020-10-03 17:18 ` Eli Zaretskii
2020-10-03 17:21 ` Lars Ingebrigtsen
2020-10-03 17:54 ` Eli Zaretskii
2020-10-03 17:56 ` Lars Ingebrigtsen
2020-10-03 18:00 ` Eli Zaretskii
2020-10-03 18:21 ` Andy Moreton
2020-10-03 18:29 ` Eli Zaretskii
2020-10-03 17:51 ` Eli Zaretskii
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