Hi, Sadly, a further update. I am now on "GNU Emacs 28.0.50 (build 1, x86_64-apple-darwin17.7.0, NS appkit-1561.61 Version 10.13.6 (Build 17G14033)) of 2020-10-15". This crashes for other reasons once every other day (I haven't been able to pin it down well enough to send a bugreport yet), but until just now it has behaved itself wrt. the NNIR search. ... Until now, that is. I again did a search, and emacs gobbled up 100% of a cpu for 10-odd seconds and then it crashed. I have gone back to the default 8MB cache size just to force the issue. What version, settings, or flags should I set up to provide as rich a picture as possible? /Mikael On Thu, 15 Oct 2020 at 09:26, Mikael Svahnberg wrote: > 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 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 >> -- >> >