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My 17.10 (and previous 17.04) system crashes at random time points (usually every 1-2 hours). This only occurs when I work, i.e. if the system is idle I've never noticed it crash. I've looked at the /var/log/kern.log and there isn't anything obvious there but there is a weird section that I highly suspect to be part of the issue:

Oct 29 08:00:13 kernel: [   15.402318] IPv6: ADDRCONF(NETDEV_CHANGE): wlp5s0: link becomes ready
Oct 29 08:00:38 kernel: [   40.459098] Could not find key with description: [97af9771c4694fe8]
Oct 29 08:00:38 kernel: [   40.459111] process_request_key_err: No key
Oct 29 08:00:38 kernel: [   40.459112] Could not find valid key in user session keyring for sig specified in mount option: [97af9771c4694fe8]
Oct 29 08:00:38 kernel: [   40.459113] One or more global auth toks could not properly register; rc = [-2]
Oct 29 08:00:38 kernel: [   40.459114] Error parsing options; rc = [-2]
Oct 29 08:00:41 kernel: [   43.911276] rfkill: input handler disabled
Oct 29 08:00:42 kernel: [   44.642111] ISO 9660 Extensions: Microsoft Joliet Level 3
Oct 29 08:00:42 kernel: [   44.643657] ISO 9660 Extensions: Microsoft Joliet Level 3
Oct 29 08:00:42 kernel: [   44.649769] ISO 9660 Extensions: RRIP_1991A
^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@
^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@
^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@
^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@Oct 29 08:21:29 kernel: [    0.000000] random: get_random_bytes called from start_kernel+0x42/0x4e1 with crng_init=0
Oct 29 08:21:29 kernel: [    0.000000] Linux version 4.13.0-16-generic (buildd@lcy01-02) (gcc version 7.2.0 (Ubuntu 7.2.0-8ubuntu2)) #19-Ubuntu SMP Wed Oct 11 18
:35:14 UTC 2017 (Ubuntu 4.13.0-16.19-generic 4.13.4)
Oct 29 08:21:29 kernel: [    0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-4.13.0-16-generic.efi.signed root=UUID=0755919f-9c39-453b-8df0-23166246cbae ro quiet splash vt.handoff=7

Any ideas to what this is and where to start? The system doesn't respond to any of the keyboard commands for handling crashes. There is some variability to the crashes, 50% of the crashes I can't move the mouse. I've also noticed that Spotify keeps playing as if everything was fine and dandy.

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It seems that this bug was due to the Nouveau driver used for my GeForce GT 710 card. Since I installed the proprietary drivers this bug stopped appearing. I guess diving into the https://nouveau.freedesktop.org/wiki/HangDiagnosis/ could be an alternative but for now I'm just happy that I don't have to restart the computer every 30-60 minutes.

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