bug#41321: 27.0.91; Emacs aborts due to invalid pseudovector objects

[Andrea Corallo]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Andrea Corallo <akrl@sdf.org>
>> Cc: pipcet@gmail.com, Stefan Monnier <monnier@iro.umontreal.ca>,
>>         41321@debbugs.gnu.org
>> Date: Fri, 22 May 2020 08:35:55 +0000
>> 
>> I'be curious of the outcome if you had a look to your 'garbage_collect'
>> assembly to investigate the possible relation with 41357 as suggested
>> here
>> https://lists.gnu.org/archive/html/bug-gnu-emacs/2020-05/msg01095.html
>
> Sorry, I'm not sure I understand what you mean by the above.  Did you
> mean whether I disassembled garbage_collect and looked at the code?

Yes, should be quick to see if callee-save regs are pushed.

> However, given the latest findings, I now doubt even more that the
> issue you identified can have any relation to this problem.  As seen
> by the backtrace I've shown in my last message, the buffer's overlay
> list has invalid overlay objects at the point of the crash.  The 2
> pointers to the overlay lists of a buffer are unconditionally marked
> in mark_buffer, so I don't see how problems in GC with Lisp objects in
> registers could interfere in this case.  Am I missing something?

Not that I'm aware, I'm no expert of the piece of code you are looking
at and haven't investigated into.  Was just a 'cheap' idea to exclude a
potential problem from the table.

  Andrea

-- 
akrl@sdf.org