kern/178412: Coredump when smbfs mounted

[Vladimir]

>Number:         178412
>Category:       kern
>Synopsis:       Coredump when smbfs mounted
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Wed May 08 06:00:00 UTC 2013
>Closed-Date:
>Last-Modified:
>Originator:     Vladimir
>Release:        9.1 amd64, 8.2 amd64
>Organization:
Tradesoft LLC
>Environment:
FreeBSD 9.1-RELEASE FreeBSD 9.1-RELEASE #0 r243825: Tue Dec  4 09:23:10 UTC 2012     root at farrell.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC  amd64

>Description:
When mounted many smbfs like this:
# mount
//MNTUSER at PC1/WINSHARE1 on /home/pc1 (smbfs, noatime)
//MNTUSER at PC2/WINSHARE2 on /home/pc2 (smbfs, noatime)
//MNTUSER at PC3/WINSHARE3 on /home/pc3 (smbfs, noatime)
//MNTUSER at PC4/WINSHARE4 on /home/pc4 (smbfs, noatime)
(and so on)

And users and FreeBSD are actively using WINSHAREX (/home/pcX), then if some of these Windows PC's shuts down without unmount, the FreeBSD may reboot or going to the coredump. When mounted more than 10 smbfs, the reboots may repeated each day. Else reboots 1-2 times at week.
>How-To-Repeat:
Mount many smbfs (10 or better 20), simulate some reads and writes both on Windows and FreeBSD. Randomly turn on and off the Windows PC's wihout unmount smbfs.
>Fix:


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