** Changed in: linux (Ubuntu)
Importance: Undecided => High
** Also affects: linux (Ubuntu Bionic)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Bionic)
Importance: Undecided => High
** Tags added: bionic kernel-key
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https://bugs.launchpad.net/bugs/1799497
Title:
4.15 kernel hard lockup about once a week
Status in linux package in Ubuntu:
Incomplete
Status in linux source package in Bionic:
Incomplete
Bug description:
My main server has been running into hard lockups about once a week
ever since I switched to the 4.15 Ubuntu 18.04 kernel.
When this happens, nothing is printed to the console, it's effectively
stuck showing a login prompt. The system is running with panic=1 on
the cmdline but isn't rebooting so the kernel isn't even processing
this as a kernel panic.
As this felt like a potential hardware issue, I had my hosting provider give
me a completely different system, different motherboard, different CPU,
different RAM and different storage, I installed that system on 18.04 and moved
my data over, a week later, I hit the issue again.
We've since also had a LXD user reporting similar symptoms here also on
varying hardware:
https://github.com/lxc/lxd/issues/5197
My system doesn't have a lot of memory pressure with about 50% of free memory:
root@vorash:~# free -m
total used free shared buff/cache
available
Mem: 31819 17574 402 513 13842
13292
Swap: 15909 2687 13222
I will now try to increase console logging as much as possible on the
system in the hopes that next time it hangs we can get a better idea
of what happened but I'm not too hopeful given the complete silence on
the console when this occurs.
System is currently on:
Linux vorash 4.15.0-36-generic #39-Ubuntu SMP Mon Sep 24 16:19:09 UTC 2018
x86_64 x86_64 x86_64 GNU/Linux
But I've seen this since the GA kernel on 4.15 so it's not a recent
regression.
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