NewNFS vs. oldNFS for 10.0?

[Andre Oppermann]

On 15.03.2013 15:01, Eggert, Lars wrote:
> Hi,
>
> this reminds me that I ran into an issue lately with the new NFS and locking for NFSv3 mounts on a client that ran -CURRENT and a server that ran
> -STABLE.
>
> When I ran "portmaster -a" on the client, which mounted /usr/ports and /usr/local, as well as the location of the respective sqlite databases over
> NFSv3, the client network stack became unresponsive on all interfaces for 30 or so seconds and e.g. SSH connections broke. The serial console
> remained active throughout, and the system didn't crash. About a minute after the wedgie I could SSH into the box again, too.

The total wedge of all interfaces certainly shouldn't happen.  This
smells like blocking on a lock on a socket_upcall() thereby wedging
tcp_input.  I don't know the lockd code so maybe Rick knows how this
could happen.

-- 
Andre

> The issue went away when I killed lockd on the client, but that caused the sqlite database to become corrupted over time. The workaround for me
> was to move to NFSv4, which has been working fine. (One more reason to make it the default...)
>
> I'm not really sure how to debug this further, but would be willing to work with someone off-list who'd tell me what tests to run.
>
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>