UI Crash @ NSCGSPanicv

Question

Created Dec ’21

Replies 3

Boosts 0

Views 1.6k

Participants 2

We've seen some crash logs coming from a few of our product users. The unique device count having this issue is pretty low but 1 of them generated 35K crash logs. And so far all of the logs have been coming from macOS 12.0.1 (21A559) build. The crash stack ended at "NSCGSPanicv" in AppKit. Any pointers on what to make sense of this will be appreciated.

Thread 0 (CRASHED)
0 AppKit 0x00007ff80c9837b6 NSCGSPanicv (in AppKit) + 261
1 AppKit 0x00007ff80c9836b1 NSCGSPanicv (in AppKit) + 0
2 AppKit 0x00007ff80c7983d4 +[NSCGSStatusItem statusItemWithWindowID:confiningDisplayID:flags:priority:systemInsertOrder:preferredPosition:appearance:] (in AppKit) + 0
3 AppKit 0x00007ff80c798402 +[NSCGSStatusItem statusItemWithWindowID:confiningDisplayID:flags:priority:systemInsertOrder:preferredPosition:appearance:] (in AppKit) + 46
4 AppKit 0x00007ff80c6ada6e -[NSStatusItem _wakeStatusItem] (in AppKit) + 316
5 AppKit 0x00007ff80c1f4394 -[NSStatusBar _statusItemWithLength:withPriority:] (in AppKit) + 95
... (our product code stack below)

The way by which our code is calling into AppKit is like this -

[[NSStatusBar systemStatusBar] statusItemWithLength:NSSquareStatusItemLength];

Boost

Answer 1

qb_s OP

Dec ’21

Answering my own question here in case anyone comes across the same. I figured out this crash happens if we call [[NSStatusBar systemStatusBar] statusItemWithLength:NSSquareStatusItemLength] when a graphic session is not available. E.g. if the code is executed through an ssh session without the same user on any active GUI session. Interesting that I tried the same with older macOS versions I don't see the crash (while I do see some error messages printed on console). It matches the fact that our crash reports have all been coming from macOS 12.

What I still don't understand is that how come our code has been executed if there is no GUI (it is registered as a LaunchAgent) but I've opened a new post for that discussion (https://developer.apple.com/forums/thread/696859).

0

Answer 2

DTS Engineer OP

Apple

Dec ’21

I don’t monitor the AppKit tag so I didn’t see this go by. I’m going to respond in your other thread and I’m replying here just to add a link between the two.

Share and Enjoy
—
Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"

0

Answer 3

qb_s OP

Dec ’21

Thank you The Eskimo as always!

0