The bug reproduced on any compiled emacs. 26.1.92 has it, latest master branch has it... Do not understand why nobody else hit it as yet .. I think the problem somehow related to NSAutoreleasePool and pthreads : https://kenji.sx/posts/nsautoreleasepooldebian Thanks, Caroptions ________________________________ From: GNU bug Tracking System Sent: Tuesday, March 5, 2019 1:17 PM To: Caroptions Caroptions Subject: bug#34762: Acknowledgement (26.1.92; objc[27300]: Invalid or prematurely-freed autorelease pool 0x1040021e0.) Thank you for filing a new bug report with debbugs.gnu.org. This is an automatically generated reply to let you know your message has been received. Your message is being forwarded to the package maintainers and other interested parties for their attention; they will reply in due course. Your message has been sent to the package maintainer(s): bug-gnu-emacs@gnu.org If you wish to submit further information on this problem, please send it to 34762@debbugs.gnu.org. Please do not send mail to help-debbugs@gnu.org unless you wish to report a problem with the Bug-tracking system. -- 34762: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=34762 GNU Bug Tracking System Contact help-debbugs@gnu.org with problems