[Bug 1803942] Re: System randomly hangs during suspend when mei_wdt is loaded

With the proposed kernel, my system passed a 30-run stress.

1. Enable the -proposed repository
2. Install the proposed kernel and reboot
3. uname -r
4.15.0-43-generic
4. sudo modprobe mei_wdt
5. for s in $(seq 30); do sudo rtcwake -v -m mem -s 15; sleep 15; done
6. verify the result is success

** Tags removed: verification-needed-bionic
** Tags added: verification-done-bionic

--
You received this bug notification because you are subscribed to linux
in Ubuntu.
Matching subscriptions: Bgg, Bmail, Nb
https://bugs.launchpad.net/bugs/1803942

Title:
System randomly hangs during suspend when mei_wdt is loaded

Status in HWE Next:
New
Status in linux package in Ubuntu:
Triaged
Status in linux source package in Bionic:
Fix Committed

Bug description:
Problem description:
System randomly hangs during suspend when mei_wdt is loaded.

Platform:
Intel Dawson Canyon I5 (NUC7i5DNHE) and I7 (NUC7i7DNHE)

Test procedure:
1. Install Ubuntu 18.04 and do apt full-upgrade

2. Enable mei_wdt:
$ sudo modprobe mei_wdt

3. Do system S3 test:
$ sudo systemctl suspend
or
$ sudo rtcwake -v -m mem -s 15

4. Afterward, I noticed that somehow system will hang during
suspend/resume.

Expect result:
Suspend/resume won't impact system.

Actual result:
System will hang during S3 test.

Additional info:
- BIOS version: V57
- Another i3 platform (NUC7i3DNHNC) doesn't have this issue.

To manage notifications about this bug go to:
https://bugs.launchpad.net/hwe-next/+bug/1803942/+subscriptions