Public bug reported:
When testing hibernation / resume on AWS with 5.0 or 5.3 kernels on
bionic (using acpid 1:2.0.28-1ubuntu1), we sometimes see failure with
repeated attempts. The first attempt will always be triggered, but the
next attempt may not. The result is the agent never triggers the
hibernation process and the instance will be forced to shutdown after a
timeout period.
Two workarounds have been identified. The first is to restart acpid
during the resume handler. The second is to use the latest upstream
acpid (as of Feb 1, 2020). This second workaround indicates there may be
a patch missing in the acpid in bionic (1:2.0.28-1ubuntu1) to work with
the 5.0+ kernels.
To reproduce this problem:
1) Launch an c4, c5, m4, m5, r4, r5 instance type with a 5.0 or 5.3 kernel on a
bionic image with on-demand hibernation support enabled.
2) Hibernate and resume the instance, ensuring the system is fully resumed
afterward and the swap file has been removed.
3) Hibernate and resume another time. The hibernate should be triggered
immediately and the instance should become unresponsive as it saves state to
disk.
4) Resume the instance, it should come back with the same processes running.
5) Repeat 3) - 4) as necessary.
** Affects: acpid (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1864045
Title:
Hibernation events sometimes missed on repeated attempts
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