kern/151681: NFS mount via IPv6 leads to hang on client with "ipfw: pullup failed"

[Martin Birgmeier]

>Number:         151681
>Category:       kern
>Synopsis:       NFS mount via IPv6 leads to hang on client with "ipfw: pullup failed"
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sun Oct 24 11:10:07 UTC 2010
>Closed-Date:
>Last-Modified:
>Originator:     Martin Birgmeier
>Release:        client: 7.3, server: 8.1
>Organization:
MBi at home
>Environment:
FreeBSD gandalf.xyzzy 7.3-RELEASE-p3 FreeBSD 7.3-RELEASE-p3 #2: Sat Oct 16 08:55:47 CEST 2010     root at gandalf.xyzzy:/d/14.1/OBJ/FreeBSD/RELENG_7_3/src/sys/XYZZY  i386
>Description:
Scenario:
- The client runs RELENG_7_3
- The server runs RELENG_8_1_0_RELEASE
- All machines are fully configured for dual IPv4/IPv6 operation
- The server exports zfs volumes both via IPv4 and IPv6
- The client mounts from the server via IPv6

Error:
- After only a few operations, the client hangs, with messages "ipfw: pullup failed" on the console

Resolution:
- The hang can only be resolved by a reboot of the client.

This hang does not occur if the mount is done via IPv4.

>How-To-Repeat:
Repeat the scenario above, and do NFS operations from the client to the server.

>Fix:


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