I tried to build jails on top of one distribution and found the following 
problem.

How to repeat:

!!!!!WARNING: IT MAY REBOOT YOUR SYSTEM!!!!!

mkdir test
cd test
mkdir a
mkdir a-ro
mkdir a-ro-rw
echo "aaaa" >> a/file1
mount -v -t unionfs -o ro ~/test/a ~/test/a-ro
mount -v -t unionfs -o -b ~/test/a-ro ~/test/a-ro-rw
vi a-ro-rw/file1   ##### <<<<<<< will reboot here

mount before reboot:
<above>:/root/test/a on /root/test/a-ro (unionfs, local, read-only, noclusterw)
<below>:/root/test/a-ro on /root/test/a-ro-rw (unionfs, noclusterw)

uname -a
FreeBSD local.local.internal 5.3-STABLE FreeBSD 5.3-STABLE #14: Sat Feb 26 
19:09:37 EST 2005     [EMAIL PROTECTED]:/usr/obj/usr/src/sys/CUSTOM  i386

Can anyone repeat it and let me know if you have the same result? Any 
suggestions what it could be?

Thanks!

Artem Koltsov
Resource Management
Wireless Facilities, Inc.

 
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