The system has been crashing randomly - typically a few seconds after waking up
from a screen lock. This has begun appearing for a week or two. The following
backtrace appears in the Xorg log file.
[ 94794.209] (EE) Backtrace:
[ 94794.212] (EE) 0: /usr/lib/xorg/Xorg (OsLookupColor+0x14d) [0x55788d223dad]
[ 94794.213] (EE) 1: /lib/x86_64-linux-gnu/libc.so.6 (__sigaction+0x40)
[0x7f99b68d6ce0]
[ 94794.216] (EE) 2: /usr/lib/xorg/modules/drivers/nvidia_drv.so
(nvidiaUnlock+0x441e2c) [0x7f99b5aaad0c]
[ 94794.216] (EE)
[ 94794.216] (EE) Segmentation fault at address 0xb9
[ 94794.216] (EE)
Fatal server error:
[ 94794.216] (EE) Caught signal 11 (Segmentation fault). Server aborting
[ 94794.216] (EE)