Andrii Kolomoiets <andreyk.mad@gmail.com> writes:

> But I found the commit after which error is occurs:
> b2949d39261e82c33572ba8a250298ef0b165b95
>
> Commenting out that 'ok = false;' line make Emacs works without errors.
>
> Justin, can you please check if Emacs prior to that commit is works fine
> for you?

I had Emacs built from master a few days ago, and got the same crashes, about twice a day, often when Emacs was idle.
So I decided to compile from the parent of the commit mentioned above, which is 73f37da12d.

However, this one also crashed, albeit with a different crash. See the attachment.