kern/66786: exporting msdosfs causes nfs to panic

[Mikhail Teterin]

>Number:         66786
>Category:       kern
>Synopsis:       exporting msdosfs causes nfs to panic
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon May 17 20:20:20 PDT 2004
>Closed-Date:
>Last-Modified:
>Originator:     Mikhail Teterin
>Release:        FreeBSD 5.2-CURRENT i386
>Organization:
Virtual Estates, Inc.
>Environment:
System: FreeBSD aldan.algebra.com 5.2-CURRENT FreeBSD 5.2-CURRENT #0: Wed May 12 08:35:10 EDT 2004 mi at aldan.algebra.com:/home/obj/oh/src/sys/DEBUG i386

>Description:
	An iRiver mp3 player is attached over USB cable and is
	seen as umass0, aka da2.

	da2s1 is mounted as /iRiver

	/iRiver is NFS-exported

	Another computer mount the /iRiver share and tries to copy
	over some music. The cp manages to create one directory and
	write 163840 bytes of the first file onto it. After that the
	"server" computer (the one with the USB-connection) panics,
	current process being nfs.

>How-To-Repeat:
	See description.

>Fix:

	Copying over to local drive on the server and then to the umass0
	seems to work. Takes much longer, though. rcp/scp may be Ok.
>Release-Note:
>Audit-Trail:
>Unformatted: