Public bug reported:
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 ?
** Affects: linux-aws-5.4 (Ubuntu)
Importance: Undecided
Status: New
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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:
New
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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