bug#43882: 27.1; Gnus sometimes crashes emacs 27.1 during nnir search

[Mikael Svahnberg]

Hi,

An update: I started emacs with the increased stack on Monday and have been working as normal since then except that I've been searching for e-mail a bit more often.

Today (Thursday), emacs crashed on me again when I was searching for e-mail.

Observations:

 - A few minutes before it started crashing I got a spinning beach ball for a few seconds while composing an e-mail.

 - The crash took much longer this time. I didn't time it, but maybe in the order of 10-15 minutes.

 - During this time I observed what I could think of through the Activity monitor:

 -- Emacs was consuming 100% CPU (of one CPU).

 -- It was eating memory at a rate of 5 MB every other second

 -- "Faults" and "UNIX system Calls" increased at a steady rate, but I have no idea where they started from or what is normal behaviour...

Now, I am going to reduce the stack size again to force the issue and update to HEAD. Let's see if that makes any difference.

/Mikael

On Mon, 12 Oct 2020 at 11:45, Robert Pluim <rpluim@gmail.com> wrote:

>>>>> On Mon, 12 Oct 2020 09:12:56 +0200, Mikael Svahnberg <Mikael.Svahnberg@bth.se> said:
    >> Do things improve if you increase your stack size using 'ulimit -s'?
    >> MacOS has what is by modern standards a fairly small default stack.
    >>
    >> There are a couple of regexp-related fixes in master as well. Could
    >> you try that branch?
    >>
    >> Robert

    Mikael> Hi,

    Mikael> The stack size was the default 8192 kB. I have -- reluctantly, but in
    Mikael> the interest of debugging -- set it to 65532 kB via ulimit and then
    Mikael> launched emacs from that shell.

Why reluctantly? 64M these days is nothing in terms of memory.

    Mikael> How can I verify from within Emacs what stack size it is running with?

You can't, but since you've launched emacs from that shell it will be
ok.

    Mikael> I will keep it like this for a couple of days and see if I get more
    Mikael> crashes. If I do, I will report and move on and upgrade to HEAD.

Thanks

Robert
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