You have been subscribed to a public bug:
With commit 30460e1ea3e6 ("fs: Enable bmap() function to properly return
errors"), applied to v5.6-rc1, running swapon on a file that has holes
returns an error (EINVAL); hibinit-agent is creating the swap file just
using fallocate(), without touching the whole file by deafult, so there
might be holes, swapon fails and hibernation cannot be performed.
To prevent this problem we need to touch the swap file before using it
and this can be done setting "touch-swap = True" in /etc/hibinit-
config.cfg.
The downside of this setting is that a new instance requires more time
to be properly "initialized" the first time it boots due to the extra
I/O required to touch the swap file (this additional I/O can be quite
consistent in large instances, like c5.18xlarge for example), but I
don't see a better way to make sure the file is all allocated without
holes, so I guess we need to turn on this option if we want to use
hibernation w/ kernels >= 5.6.
** Affects: linux (Ubuntu)
Importance: High
Assignee: Balint Reczey (rbalint)
Status: Incomplete
** Affects: linux (Ubuntu Groovy)
Importance: High
Assignee: Balint Reczey (rbalint)
Status: Incomplete
** Tags: fr-205 id-5f47d0f8b8ce963bb1e25973
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ec2-hibinit-agent needs to properly initialize swap file
https://bugs.launchpad.net/bugs/1892728
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