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bug#24764: 25.1.50; Another crash in automatic gc
From: |
Andreas Schwab |
Subject: |
bug#24764: 25.1.50; Another crash in automatic gc |
Date: |
Sat, 22 Oct 2016 13:41:15 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/25.1 (gnu/linux) |
On Okt 22 2016, Eli Zaretskii <eliz@gnu.org> wrote:
>> I think this could be provoked by some lisp stuff I currently develop
>> that does a lot of consing, dunno (but of cause I don't funcall `crash'
>> anywhere, at least not willingly :-) ). Crashs happen every ten minutes or
>> so, and at totally random points.
>>
>> Here is the gdb output. Session still open.
>> [...]
>>
>> (gdb) bt full
>> #0 0x000000000058aae0 in unchain_marker (marker=0x88e9968) at marker.c:605
>> tail = 0x2020200020202020 <<<<<<<<<<<<<<<<<<<<<<<<
>> prev = 0x2020200020202030 <<<<<<<<<<<<<<<<<<<<<<<<
>
> Your marker pointers are actually full of blank (and other ASCII)
> characters. So some code somewhere either writes past the end of some
> stack-based array or otherwise overwrites the stack.
More likely, BUF_MARKERS is already overwritten. (The "other ASCII
character" comes from the offset of ->next). What do the other contents
of b->text look like? Finding the place where a member of a struct
buffer is overwritten can be done with a watchpoint.
Andreas.
--
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5
"And now for something completely different."
- bug#24764: 25.1.50; Another crash in automatic gc, Michael Heerdegen, 2016/10/22
- bug#24764: 25.1.50; Another crash in automatic gc, Eli Zaretskii, 2016/10/22
- bug#24764: 25.1.50; Another crash in automatic gc,
Andreas Schwab <=
- bug#24764: 25.1.50; Another crash in automatic gc, Eli Zaretskii, 2016/10/22
- bug#24764: 25.1.50; Another crash in automatic gc, Eli Zaretskii, 2016/10/22
- bug#24764: 25.1.50; Another crash in automatic gc, Michael Heerdegen, 2016/10/22
- bug#24764: 25.1.50; Another crash in automatic gc, Eli Zaretskii, 2016/10/22
- bug#24764: 25.1.50; Another crash in automatic gc, Michael Heerdegen, 2016/10/22
- bug#24764: 25.1.50; Another crash in automatic gc, Eli Zaretskii, 2016/10/22
- bug#24764: 25.1.50; Another crash in automatic gc, Michael Heerdegen, 2016/10/22
- bug#24764: 25.1.50; Another crash in automatic gc, Eli Zaretskii, 2016/10/22
- bug#24764: 25.1.50; Another crash in automatic gc, Michael Heerdegen, 2016/10/23
- bug#24764: 25.1.50; Another crash in automatic gc, Eli Zaretskii, 2016/10/23