kern/66152: laying unionfs over another unionfs mount causes server to crash

[Jacques Marneweck]

>Number:         66152
>Category:       kern
>Synopsis:       laying unionfs over another unionfs mount causes server to crash
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sat May 01 13:00:41 PDT 2004
>Closed-Date:
>Last-Modified:
>Originator:     Jacques Marneweck
>Release:        FreeBSD 5.2.1-RELEASE-p5
>Organization:
Ataris Technologies
>Environment:
su-2.05b# uname -a
FreeBSD xxxxxx.xxxxxxxxx.xx.xx 5.2.1-RELEASE-p5 FreeBSD 5.2.1-RELEASE-p5 #0: Fri Apr 30 21:51:03 SAST 2004     xxxxxxx at xxxxxx.xxxxxxxxx.xx.xx:/usr/obj/usr/src/sys/XXXXXX  i386
>Description:
Running something like 'make' or 'make install' or 'make install clean' etc. on a filesystem which utilises two layers of unionfs mounts below each other seems to either cause a kernel panic or a deadlock.  One then has to reboot the server in order to continue working.
>How-To-Repeat:
type "make install clean" or "make install" or "make" on the filesystem space mounted over two unionfs layers.
>Fix:

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