in case anyone's interested, the upstream fix is:
commit c4f9c701f9b44299e6adbc58d1a4bb2c40383494
Author: Huang Ying
Date: Thu Oct 15 20:06:07 2020 -0700
mm: fix a race during THP splitting
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this bug is present in the current upstream also (v5.8).
Red Hat is working on the fix (ref: 1739593, private)
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https://bugs.launchpad.net/bugs/1800509
Title:
unable to handle kernel NU
[Expired for linux (Ubuntu) because there has been no activity for 60
days.]
** Changed in: linux (Ubuntu)
Status: Incomplete => Expired
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T
Please reproduce the problem, do a hard reset and then run this command:
journalctl -b-1 > prev_boot.txt
and send us the resulting file prev_boot.txt
** Changed in: linux (Ubuntu)
Status: Confirmed => Incomplete
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We don't know what triggered this bug. While the server was operational
and hosting 5 virtual machines, we saw abnormal behavior to one of them
and after a while the whole host became unresponsive due to high loads.
We were unable to force shutdown guest vms due to device or resource
busy error. W
Thank you for taking the time to report this bug and helping to make
Ubuntu better. Unfortunately, we cannot work on this bug because your
description didn't include enough information. You may find it helpful
to read "How to report bugs effectively"
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apport information
** Tags added: apport-collected xenial
** Description changed:
```Oct 29 13:51:25 vs09 kernel: [201179.645520] BUG: unable to handle kernel
NULL pointer dereference at 0007
Oct 29 13:51:25 vs09 kernel: [201179.645601] IP: split_swap_cluster+0x4f/0x70
Oct 29
Did this issue start happening after an update/upgrade? Was there a
prior kernel version where you were not having this particular problem?
Would it be possible for you to test the latest upstream kernel? Refer
to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
v4.19 kernel[
It seems to have a 'kvm' relation.
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Cristian Aravena Romero (caravena)
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Title:
unable to handle kernel NULL pointer dereference at
** Package changed: ubuntu => linux (Ubuntu)
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Title:
unable to handle kernel NULL pointer dereference at 0007
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