Hi again,
I finally found out the cause of these random hibernate/resume freezes.
My swap partition is a logical volume which itself lies on a luks
encrypted partition, togother with the root and /home logicla volumes.
I switched to a normal swap partition, based on a real primary
partition. I was then able to hibernate/resume 10 times like this :
for i in $(seq 1 10)
do
sleep 3
rtcwake -m disk -s 30
done
without the least kernel fault or any freezes, whatever the kernel
version I use.
I am surprised that a swap partition based on an encrypted partition
causes such problems, on several sites advocating full encryption (swap
included) it seemed stable enough.
Hopes this helps.
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https://bugs.launchpad.net/bugs/1566302
Title:
Ubuntu 16.04: Suspend freezes the system after upgrade to linux image
4.4.0-16
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