My Debian Sid (KDE) OS (on a PC with an Nvidia GTX 970, proprietary drivers, an i7-8700K CPU, and 16GB RAM) has begun freezing randomly. Once or twice a day, it's completely unresponsive; the mouse won't move, and SysRq does nothing.
This began after upgrading a bunch of packages. I checked syslog but nothing sticks out at me. Does anyone have any ideas on what could be wrong, or advice on how I can debug the issue?
/var/log/messsages May 16 10:33:20 hiiaka kernel: [17020.784351] perf: interrupt took too long (2503 > 2500), lowering kernel.perf_event_max_sample_rate to 79750 May 16 12:03:17 hiiaka kernel: [ 0.000000] microcode: microcode updated early to revision 0xaa, date = 2018-12-12 May 16 12:03:17 hiiaka kernel: [ 0.000000] Linux version 4.19.0-4-amd64 (firstname.lastname@example.org) (gcc version 8.3.0 (Debian 8.3.0-2)) #1 SMP Debian 4.19.28-2 (2019-03-15) May 16 12:03:17 hiiaka kernel: [ 0.000000] Command line: BOOT_IMAGE=/vmlinuz-4.19.0-4-amd64 root=/dev/mapper/hiiaka--vg-root ro quiet
List of recent package history is here: https://pastebin.com/eZH1qf2e