zfs crash on high load

[Volodymyr Kostyrko]

Hi all.

Recently I switched to 9.0 and then moved to clang. When I moved to 9.0 
btpd failed to start hanging in some state without printing the name of 
the state. When I switched to clang the machine drops to debugger, 
however when I try to dump it drops core again for the second time:

I've shooted the screen with all debugger stuff and dropped it at 
http://limbo.xim.bz/trap/. It looks like something bad happens in 
zap_leaf_lookup.

uname -a:
FreeBSD limbo.lan 9.0-BETA2 FreeBSD 9.0-BETA2 #1: Tue Sep 20 23:00:24 
EEST 2011     arcade at limbo.lan:/usr/obj/usr/src/sys/MINIMAL  i386

-- 
Sphinx of black quartz judge my vow.