seems like twe driver is unstable

[Artem Koutchine]

Hi!

I have raid-5 on 3W 8506-4LP and it seems like
there is some kind of instability in the twe driver.
For example, when i pull one of the hotswap
sata hdds sometimes
i get:

Memory modified after free 0x788f400(508) val=20202020 @ 0xe788f400
panic: Most recently used by devbuf
at line 128 in file /usr/src/sys/udm_dbg.c
cpu=0;
Debugger ("panic")
Stopped at Debugger +0.46: xchgl %ebx, in_Debugger.0

and i typed 'c' in debugger:

the system started to shutdown and here is what i saw:

twe0: failed to delete unit 0
stray irq9

The box is:
Supermicro DPE-G2 motherboard
DUAL XEON 2.66Ghz (HT enabled)
2GB RAM
4 SATA SEAGTE 120GB DRIVES
3WARE 8506-4LP SATA RAID5 CONTROLLER
FREEBSD 5.2-CURRENT (cvsed and build apr 1).