Comment 0 for bug 1814874

Under memory pressure, my VM locks up. This has been reported upstream though I don't know how far any solution has progressed.

https://bugzilla.kernel.org/show_bug.cgi?id=201603

Feb 6 07:15:42 vps632258 kernel: [151336.450064] z3fold: unknown buddy id 0
Feb 6 07:15:42 vps632258 kernel: [151336.454450] BUG: unable to handle kernel NULL pointer dereference at 0000000000000008

The little bit of log I managed to salvage is attached.

This has happened to two identical VMs. Unusually it has not occurred on a third VM which is configured the same but has less RAM (fingers crossed it won't).

Irrelevant information:
I thought the lock-ups were due to me using a BTRFS filesystem, however I swapped over to NILFS2 and this still occurs. The only difference seems to be that I am now able to grab some of the kernel output.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-4.18.0-14-generic 4.18.0-14.15~18.04.1
ProcVersionSignature: Ubuntu 4.18.0-14.15~18.04.1-generic 4.18.20
Uname: Linux 4.18.0-14-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.5
Architecture: amd64
Date: Wed Feb 6 10:55:05 2019
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: linux-signed-hwe
UpgradeStatus: No upgrade log present (probably fresh install)