This bug was fixed in the package linux - 5.4.0-105.119
---
linux (5.4.0-105.119) focal; urgency=medium
* CVE-2022-0847
- lib/iov_iter: initialize "flags" in new pipe_buffer
* Broken network on some AWS instances with focal/impish kernels
(LP: #1961968)
- SAUCE:
= focal verification =
ubuntu@client:~$ cat /proc/version_signature
Ubuntu 5.4.0-102.115-generic 5.4.174
ubuntu@client:~$ ./elbencho/bin/elbencho -t 40 -r -n 10 -N 5000 -s 128k -b 128k
/mnt/nfs/ubuntu
OPERATION RESULT TYPEFIRST DONE LAST DONE
= ==
This bug is awaiting verification that the linux/5.4.0-102.115 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
** Changed in: linux (Ubuntu Focal)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu Focal)
Status: In Progress => Fix Committed
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** Attachment added: "nfstest_delegation-5.4.0-95-generic+fix.log"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1957986/+attachment/254/+files/nfstest_delegation-5.4.0-95-generic+fix.log
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** Description changed:
[Impact]
An NFSv4 client that does a lot of opens/closes can overwhelm and NFSv4
server, causing a significant drop in performance. In my testing, I've seen
performance drop from ~700MiB/s down to < 10MiB/s. The same workload using
NFSv3 does not have this problem.
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