Comment 2 for bug 1887607

I installed 4.15.0-114-generic from -proposed to my test client machine, which is a Ubuntu 18.04 Desktop VM.

I mounted two NFS shares, one with sec=sys, and the other with sec=krb5p. I then opened each share up in separate tabs in Nautilus.

I then CUT a file from the sec=sys share, and PASTED it into the sec=krb5p share. The file pasted to the new share correctly, and was removed from the original share.

I repeated this several times, and each file movement was successful with no hangs.

I then moved all files from the sec=krb5p share, back to the sec=sys share, selected all files, then CUT and PASTED them to the sec=krb5p share.

All files moved without the system hanging. I repeated this a number of times, and the system functions correctly.

There is an occasional delay when pasting some files, that lasts for no more than a few seconds, which happens when a file copy is interrupted, but the NFS subsystem recovers, likely finding the correct slot and sequence number, and the file moves successfully. The delay is likely due to the NFS client needing a few round trips to the server to discover the correct slot and sequence number.

The hang is fixed, and I am happy to mark this as verified.