It seems the kernel needs to be fixed, because fallocate changed in the kernel
according to Andrea:
https://lkml.org/lkml/2020/9/4/259
** Package changed: ec2-hibinit-agent (Ubuntu Groovy) => linux (Ubuntu Groovy)
** Changed in: linux (Ubuntu Groovy)
Assignee: Balint Reczey (rbalint) => (unassigned)
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https://bugs.launchpad.net/bugs/1892728
Title:
ec2-hibinit-agent needs to properly initialize swap file
Status in linux package in Ubuntu:
Incomplete
Status in linux source package in Groovy:
Incomplete
Bug description:
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.
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