kern/158432: gssd generate much network traffic and led to kernel panic

[Martin Laabs]

>Number:         158432
>Category:       kern
>Synopsis:       gssd generate much network traffic and led to kernel panic
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Wed Jun 29 14:50:08 UTC 2011
>Closed-Date:
>Last-Modified:
>Originator:     Martin Laabs
>Release:        8.2-STABLE
>Organization:
non
>Environment:
FreeBSD pc.martinlaabs.de 8.2-STABLE FreeBSD 8.2-STABLE #1: Mon Jun  6 13:52:51 CEST 2011     martin at pc.martinlaabs.de:/usr/obj/usr/src/sys/PC_KERNEL  i386

>Description:
The /home directory is mounted via nfs (krbos-secured), IPv6 from the server. Sometimes, and repeatable after starting openoffice gssd produces much network traffic and i am unable to do a "ls" in my home directory. However all file operation and also a "ls" in subdirectories work.
In this state gssd took also lot of CPU power. When stopping or restarting gssd the kernel panics. 

The following nfs related is enabled in my rc.conf file (client side)

nfsuserd_enable="YES"
nfscbd_enable="YES"
nfs_client_enable="YES"
gssd_enable="YES"
rpc_lockd_enable="YES"
rpc_statd_enable="YES"
rpcbind_enable="yes"             # Run the portmapper service (YES/NO).
rpcbind_flags="-i"                # Flags to rpcbind (if enabled).

>How-To-Repeat:
Set up a IPv6 network with kerberos authentification. Enable the NFS server option on this server, put the following line into the /etc/exports

/usr/home  -sec=krb5p <host list>

Mount the directory on a client machine o /home i.e. by putting 

server:/usr/home        /home        nfs   rw       0       0

in your /etc/fstab file and mount /home.

Now start openoffice 3.3.0 and watch the network traffic. When it runs to maximum of you network short after stop the gssd daemon.
>Fix:


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