From: "Nicolas Bértolo" <nicolasbertolo@gmail.com>
To: Pip Cet <pipcet@gmail.com>
Cc: Paul Eggert <eggert@cs.ucla.edu>,
41755@debbugs.gnu.org, Andrea Corallo <akrl@sdf.org>
Subject: bug#41755: feature/native-comp (master?): temacs crash in GC during mark phase
Date: Mon, 8 Jun 2020 15:51:14 -0300 [thread overview]
Message-ID: <CAFnS-OnpWnyWWWqDCVET_LG1HkxsqBHZXmsSRWDbWRYUjQ3haw@mail.gmail.com> (raw)
In-Reply-To: <CAOqdjBdU-pBWyewqC_eLAFckSffLOtuoFDp8CCa7MdUmEPzSzA@mail.gmail.com>
> I'm wondering what we could do to make such bugs easier to find...
We could add a canary to stack based strings and conses. Then while
marking if we
come across a stack based string or cons we check that the canary is intact. If
it is not, then we can be sure that the memory has been written over.
Something like this:
struct Stack_String
{
struct Lisp_String string;
uint64_t canary = 0x12341234;
};
> Would GC_CHECK_MARKED_OBJECTS have caught this?
As far as I can see, during a GC we can't know if a stack-based string
is still alive.
next prev parent reply other threads:[~2020-06-08 18:51 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-07 19:16 bug#41755: feature/native-comp (master?): temacs crash in GC during mark phase Andrea Corallo
2020-06-07 19:41 ` Pip Cet
2020-06-07 19:57 ` Nicolas Bértolo
2020-06-07 20:18 ` Pip Cet
2020-06-07 23:09 ` Nicolas Bértolo
2020-06-08 3:39 ` Nicolas Bértolo
2020-06-08 6:29 ` Eli Zaretskii
2020-06-08 18:24 ` Nicolas Bértolo
2020-06-08 6:41 ` Pip Cet
2020-06-08 18:51 ` Nicolas Bértolo [this message]
2020-06-08 19:05 ` Pip Cet
2020-06-09 14:20 ` Nicolas Bértolo
2020-06-10 12:53 ` Andrea Corallo
2020-06-27 14:39 ` Andrea Corallo
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