kern/152022: nfs service hangs with linux client

[T. Taner]

>Number:         152022
>Category:       kern
>Synopsis:       nfs service hangs with linux client
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sun Nov 07 18:20:13 UTC 2010
>Closed-Date:
>Last-Modified:
>Originator:     T. Taner
>Release:        9.0-CURRENT
>Organization:
>Environment:
FreeBSD pulsar 9.0-CURRENT FreeBSD 9.0-CURRENT #0: Sun Nov  7 04:08:43 EET 2010    root at pulsar:/usr/obj/usr/src/sys/PULSAR  amd64
>Description:
It seems latest nfs related changes (9.0-CURRENT) break Linux nfs client support. Nfs service (Nov,06 cvs) hangs certainly, during mount with linux client. Nfsd daemon going into "D" state, which is not able to KILL. System can't able reboot until doing hard reset. There is no problem with freebsd clients. Problem is reproducible with linux clients.
>How-To-Repeat:
Doing with a linux client:

mount -t nfs fbsd-server:/exported/dir /mount-point
>Fix:


>Release-Note:
>Audit-Trail:
>Unformatted: