Panic(cpu 4 caller 0xffffff801af53a13): userspace watchdog timeout: no successful checkins from in 120 seconds Literally *nothing* else open on the system except the time machine backup was in progress. This sounds exactly like my scenario, except on a iMac Retina 5k 4-core i7. Service:, total successful checkins since load (7090 seconds ago): 709, last successful checkin: 0 seconds ago Service:, total successful checkins since load (7120 seconds ago): 701, last successful checkin: 120 seconds ago Service returned not alive with context : unresponsive dispatch queue(s): -wl

Panic(cpu 4 caller 0xffffff801dd53a13): userspace watchdog timeout: no successful checkins from in 120 seconds I used to brag to my friends how stable and secure MacOS was. This time it crashed with Android studio open, safari open, the app store open, and amazon music playing. The odd thing is one time it crashed when I wasn't even using the computer. With the upgrade to Big Sur 11.0.1, my iMac Retina 4K 6-core intel core i7 has become highly unstable.

Kaspersky big sur