[Mac] kitty freezes in native full screen

[DazWorrall]

I've seen this on 0.14.1 and above, maybe also 0.14.0, though I cannot reliably reproduce. I have kitty in native fullscreen alongside another app, and sometimes after returning to it from another desktop I find it frozen (beachball on mouseover, not responding in activity monitor). It's thankfully not spinning a CPU:

dtruss show's it's not entirely dead, though it doesn't reveal much else:

sample dtruss output - the PID matches the unresponsive window

daz$ sudo dtruss -n kitty
dtrace: system integrity protection is on, some features will not be available

	PID/THRD  SYSCALL(args) 		 = return
48665/0x121c413:  bsdthread_ctl(0x100, 0x0, 0x13A4F)		 = 0 0
48665/0x121c413:  bsdthread_ctl(0x100, 0x0, 0x0)		 = 0 0
48665/0x121c413:  bsdthread_ctl(0x100, 0x0, 0x13A4F)		 = 0 0
48665/0x121c413:  bsdthread_ctl(0x100, 0x0, 0x0)		 = 0 0
48665/0x121c413:  bsdthread_ctl(0x100, 0x0, 0x13A4F)		 = 0 0
48665/0x121c413:  bsdthread_ctl(0x100, 0x0, 0x0)		 = 0 0
48665/0x121c413:  bsdthread_ctl(0x100, 0x0, 0x13A4F)		 = 0 0
48665/0x121c413:  bsdthread_ctl(0x100, 0x0, 0x0)		 = 0 0
48665/0x121c413:  bsdthread_ctl(0x100, 0x0, 0x13A4F)		 = 0 0
48665/0x156bb82:  bsdthread_ctl(0x100, 0x0, 0x8BAB)		 = 0 0
48665/0x156bb82:  workq_kernreturn(0x20, 0x0, 0x1)		 = 0 0
48665/0x156bf03:  thread_selfid(0x0, 0x0, 0x0)		 = 22462211 0
48665/0x156bf03:  bsdthread_ctl(0x100, 0x0, 0x8BAB)		 = 0 0
48665/0x156bf03:  ulock_wake(0x1000002, 0x7FFF9CA2B1C0, 0x0)		 = -2 0
48665/0x156bb82:  ulock_wait(0x1010002, 0x7FFF9CA2B1C0, 0x639E)		 = 0 0
48665/0x156bb82:  kevent_id(0x600000274B40, 0x70000EFBAB80, 0x1)		 = 0 0
48665/0x121c413:  bsdthread_ctl(0x100, 0x0, 0x0)		 = 0 0
48665/0x156bf03:  workq_kernreturn(0x4, 0x0, 0x0)		 = 0 Err#-2
48665/0x156bf03:  __disable_threadsignal(0x1, 0x0, 0x0)		 = 0 0
48665/0x121c413:  bsdthread_ctl(0x100, 0x0, 0x13A4F)		 = 0 0
48665/0x121c413:  bsdthread_ctl(0x100, 0x0, 0x0)		 = 0 0
dtrace: error on enabled probe ID 2366 (ID 897: syscall::thread_selfid:return): invalid user access in action #5 at DIF offset 0
48665/0x121c413:  bsdthread_ctl(0x100, 0x0, 0x13A4F)		 = 0 0
48665/0x156bb82:  workq_kernreturn(0x100, 0x70000EFBAB80, 0x1)		 = 0 Err#-2
48665/0x156bb82:  bsdthread_ctl(0x100, 0x0, 0x63A3)		 = 0 0
48665/0x156bb82:  workq_kernreturn(0x20, 0x0, 0x1)		 = 0 0
48665/0x156c423:  thread_selfid(0x0, 0x0, 0x0)		 = 22463523 0
48665/0x156bb82:  kevent_id(0x600000274B40, 0x70000EFBAB80, 0x1)		 = 0 0
48665/0x156c423:  bsdthread_ctl(0x100, 0x0, 0x63A3)		 = 0 0
48665/0x121c413:  bsdthread_ctl(0x100, 0x0, 0x0)		 = 0 0
48665/0x156bb82:  workq_kernreturn(0x100, 0x70000EFBAB80, 0x1)		 = 0 Err#-2
48665/0x156bb82:  __disable_threadsignal(0x1, 0x0, 0x0)		 = 0 0
...

MacOS version is 10.14.5 (18F132). What else can I capture to help debug this?

[kovidgoyal]

Try setting sync_to_monitor no in kitty.conf and see if that fixes it.

[DazWorrall]

Done, will report back, thanks. I should have included my kitty.conf, here's what I've customised:

font_family      Monaco
font_size 12.0
open_url_modifiers cmd
copy_on_select yes
select_by_word_characters @-./_~?&%+#
sync_to_monitor no
enable_audio_bell no
enabled_layouts vertical,fat:bias=70,grid
inactive_text_alpha 0.6
macos_option_as_alt no
macos_quit_when_last_window_closed yes
macos_thicken_font 0.75
kitty_mod alt+shift
map shift+page_up   scroll_page_up
map shift+page_down scroll_page_down
map shift+cmd+enter kitten zoom_toggle.py
map alt+left send_text normal \x1bb
map alt+right send_text normal \x1bf

[mong8se]

I've been experiencing the same issue and for what it's worth, "sync_to_monitor no" has been working since I saw this issue thread yesterday.

[kovidgoyal]

Can someone post a detailed set of steps to reproduce it, I am not a
macOS users, so the more detailed the better.

[kovidgoyal]

Note that the fix I made is speculative since I cant reproduce. So someone please test it.

[Luflosi]

I think we should print a warning when this happens.

[kovidgoyal]

Sure feel free to send a PR for it.