spammed with kernel: get_swap_device: Bad swap file entry [SOLVED]

graysky · 2021-12-05 14:40:24

About 1-1/2 hours into an rsync backup, my workstation became unresponsive. I had to hard reset. Upon inspecting journalctl, I found the entire 100 MB of it was spammed with repeating lines like this:

Dec 05 09:27:43 quadruple kernel: get_swap_device: Bad swap file entry 3fffe7fffffff
Dec 05 09:27:43 quadruple kernel: get_swap_device: Bad swap file entry 3fffe7fffffff
...

This machine has 64G of memory and no swap defined. Kernel is 5.15.6.arch2-1. Googling this does not give relevant hits. Any insights are appreciated.

Last edited by graysky (2021-12-06 07:47:01)

seth · 2021-12-05 15:02:00

https://patchwork.kernel.org/project/li … intel.com/
Doesn't seem in https://git.kernel.org/pub/scm/linux/ke … ap_state.c

no swap defined

Sure?
https://wiki.archlinux.org/title/Zswap ?

graysky · 2021-12-05 16:13:28

@seth - ah, yes

% cat /sys/module/zswap/parameters/enabled
Y

Was unaware of zswap, thanks for the pointer.

The patch you called out seems to just suppress the warning. I am wondering what put the machine in that state in the first place.

seth · 2021-12-05 16:54:19

Not sure whether it's strictly zswap related.

swapon

Do you maybe keep a swapfile for hibernation?

graysky · 2021-12-05 17:07:33

I do not. I was able to finish the rsync backup with seeing this again. It is a bit disturbing that it caused a GUI and keyboard freeze. I could ping the box from another on the LAN. I do not have ssh enabled on it so I couldn't attempt a graceful reboot.

seth · 2021-12-05 20:35:59

I could imagine that the system tries to swap out, but doesn't find valid swap space.
You could try to
a) add (and swapon) a dummy swapfile (doesn't have to be huge, just there)
b) set "sudo sysctl vm.swappiness=0" to lower the chance of a swapout

Head_on_a_Stick · 2021-12-05 21:03:30

Check your memory health.

graysky · 2021-12-05 22:32:00

Head_on_a_Stick wrote:

Check your memory health.

Good call, wrought with memtest86+ errors unfortunately. Looks like I am off to the lovely RMA game. Thanks for the suggestion.

Arch Linux

#1 2021-12-05 14:40:24

spammed with kernel: get_swap_device: Bad swap file entry [SOLVED]

#2 2021-12-05 15:02:00

Re: spammed with kernel: get_swap_device: Bad swap file entry [SOLVED]

#3 2021-12-05 16:13:28

Re: spammed with kernel: get_swap_device: Bad swap file entry [SOLVED]

#4 2021-12-05 16:54:19

Re: spammed with kernel: get_swap_device: Bad swap file entry [SOLVED]

#5 2021-12-05 17:07:33

Re: spammed with kernel: get_swap_device: Bad swap file entry [SOLVED]

#6 2021-12-05 20:35:59

Re: spammed with kernel: get_swap_device: Bad swap file entry [SOLVED]

#7 2021-12-05 21:03:30

Re: spammed with kernel: get_swap_device: Bad swap file entry [SOLVED]

#8 2021-12-05 22:32:00

Re: spammed with kernel: get_swap_device: Bad swap file entry [SOLVED]

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