Hi @hloeung, these patches are available in 4.15.0-128-generic, and
5.4.0-58-generic.
They are both re-spins of 4.15.0-126-generic and 5.4.0-56-generic,
respectively.
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@mruffell, that's for Bionic, but for Focal is that still
5.4.0-56-generic? Or is there a new respun kernel to include these
patches?
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https://bugs.launchpad.net/bugs/1898786
Title:
Hi Benjamin,
The respun kernel has now landed in -updates, and is version
4.15.0-128-generic.
Please re-schedule the maintenance window for the Launchpad git server,
and re-attempt moving to the fixed kernel.
Thanks,
Matthew
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Hi Benjamin,
I have good news. The SRU has completed, and the new kernels have now
been released to -updates. Their versions are:
Bionic:
4.15.0-126-generic
Focal:
5.4.0-56-generic
You can go ahead and schedule that maintenance window now, to install
the latest kernel from -updates. These
This bug was fixed in the package linux - 4.15.0-126.129
---
linux (4.15.0-126.129) bionic; urgency=medium
* bionic/linux: 4.15.0-126.129 -proposed tracker (LP: #1905305)
* CVE-2020-4788
- SAUCE: powerpc/64s: Define MASKABLE_RELON_EXCEPTION_PSERIES_OOL
- SAUCE:
This bug was fixed in the package linux - 5.4.0-56.62
---
linux (5.4.0-56.62) focal; urgency=medium
* focal/linux: 5.4.0-56.62 -proposed tracker (LP: #1905300)
* CVE-2020-4788
- selftests/powerpc: rfi_flush: disable entry flush if present
- powerpc/64s: flush L1D on
Ack !
I'll check with Launchpad team then, I think they would probably prefer
to wait for the -updates indeed.
Thanks again for your work dans Dan's.
Cheers,
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Hi Benjamin,
No worries about being busy.
Now, the kernel is scheduled to be released early next week, around the
30th of November. I think at this stage it is best to wait it out and
install the kernel once it reaches -updates.
That way you will have a fixed kernel that is supported by
Hello Matthew, sorry for the lack of response.
I'll check with Launchpad people if we can justify a reboot of the
server soon and will keep you posted !
Regards,
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Performing verification for Bionic.
Since Benjamin hasn't responded, I will try and verify the best I can.
I made a instance on AWS. I used a c5d.large instance type, and added
8gb extra EBS storage.
I installed the latest kernel from -updates to get a performance
baseline. kernel is
Performing verification for Focal.
Since Benjamin hasn't responded, I will try and verify the best I can.
I made a instance on AWS. I used a c5d.large instance type, and added
8gb extra EBS storage.
I installed the latest kernel from -updates to get a performance
baseline. kernel is
Hi Benjamin,
The kernel team have built the next kernel update, and they have placed
it in -proposed for verification.
The versions are 4.15.0-125-generic for Bionic, and 5.4.0-55-generic for
Focal.
Can you please schedule a maintenance window for the Launchpad git
server, to install the new
This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
focal' to 'verification-done-focal'. If the problem still exists, change
the tag
This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
bionic' to 'verification-done-bionic'. If the problem still exists,
change the tag
** Changed in: linux (Ubuntu Bionic)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1898786
Title:
bcache: Issues with large IO wait in bch_mca_scan()
** Changed in: linux (Ubuntu Focal)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1898786
Title:
bcache: Issues with large IO wait in bch_mca_scan() when
Patches have been submitted to the Ubuntu kernel mailing list:
Patchset for Bionic:
https://lists.ubuntu.com/archives/kernel-team/2020-October/114166.html
https://lists.ubuntu.com/archives/kernel-team/2020-October/114167.html
https://lists.ubuntu.com/archives/kernel-team/2020-October/114168.html
** Description changed:
BugLink: https://bugs.launchpad.net/bugs/1898786
[Impact]
Systems that utilise bcache can experience extremely high IO wait times
when under constant IO pressure. The IO wait times seem to stay at a
consistent 1 second, and never drop as long as the bcache
** Summary changed:
- Issue with bcache bch_mca_scan causing huge IO wait
+ bcache: Issues with large IO wait in bch_mca_scan() when shrinker is enabled
** Also affects: linux (Ubuntu Focal)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu)
Status: Confirmed =>
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