Crash on Mac OS v11.7.11 "BigSur" from v4.6.0 onwards

[nc50lc]

Description

This is reported by two users in Bitcointalk: https://bitcointalk.org/index.php?topic=5578138.0

Electrum doesn't log the cause of the issue or at least the provided log by the reporter. (logs in the linked thread)
Another user reported that the crash only happens in v4.6.0 to the latest, he's using v4.5.8 for now.

Unfortunately, those are all the details shared in that topic.
Feel free to close this if the affected users can't provide more information or if there's not enough info to solve the issue.

[SomberNight]

Would be good to know:

• So does it crash the moment the user switches to the "Addresses" tab?
• And it only crashes on macOS 11, not on 12?

---

In 4.6.0, we switched from Qt 5.15.x to Qt 6.6.2 (on macOS).
If the crash happens when switching to the Addresses tab, I would guess ultimately it is a bug in Qt.

We could switch to a different version of Qt, but realistically we would also bump the min required macOS version at the same time:

electrum/contrib/deterministic-build/requirements-binaries-mac.txt

Line 118 in 7c433c5

PyQt6-Qt6==6.6.2 \

electrum/contrib/requirements/requirements-binaries-mac.txt

Lines 1 to 5 in 7c433c5

	# Qt 6.8 would require macOS 12+, 6.7 still supports macOS 11
	# Qt 6.7 has issue "No QtMultimedia backends found." (i.e. camera does not work)
	# PyQt6-Qt6==6.6.3 segfaults with "illegal hardware instruction"
	PyQt6<6.7
	PyQt6-Qt6<6.7,!=6.6.3

We could switch to Qt 6.9, bumping the min macOS to 12:
#3685 (comment)

[nc50lc]

Would be good to know:

• So does it crash the moment the user switches to the "Addresses" tab?
• And it only crashes on macOS 11, not on 12?

Thanks, I'll notify the users who reported the issue on Bitcointalk to see if they can answer any of these.

[nc50lc]

The OP of the referenced thread updated with the following:

Yes it crushes the moment I switched to Addresses Tab.
I am running macOS 11.7.11