Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: linux-aws-5.4 (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1946032
Title:
NFS client fails to mount with timeout on kernel 5.4.0-1057-aws
Status in linux-aws-5.4 package in Ubuntu:
Confirmed
Bug description:
On an Ubuntu 18.04.1 server, I mount AWS EFS filesystems with nfsv4.1
successfully on ec2 instances.
Mounts work on kernel version 5.4.0-1056-aws but if i upgrade the
kernel to 5.4.0-1057-aws the mounts stop working with a network
timeout, due to port 111 being blocked as its not needed for nfsv4
Issue started to happen when apt daily automatically upgraded the
kernel version. I reproduced by rolling back kernel version on the
same instance and doing mounts successfully, then reverting to newer
kernel (plus reboot) and getting the network timeout issue.
Mount command is identical in all cases and follows AWS Documentation
```
sudo mount -t nfs -o
nfsvers=4.1,rsize=1048576,wsize=1048576,hard,timeo=600,retrans=2,noresvport
mount-target-DNS:/ ~/efs-mount-point
```
Could it be a kernel bug or misconfiguration, what can i do ?
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