5.2-current does not allow login and panics with modified memory after free

Hello!

I am trying to run 5.2-CURRENT (cvsupped and rebuild apr 1) on the following
server:

Supermicro DPE-G2 motherboard
DUAL XEON 2.66Ghz (HT enabled)
2GB RAM
4 SATA SEAGTE 120GB DRIVES
3WARE 8506-4LP SATA RAID5 CONTROLLER

SATA drivers are joint into a single RAID5 array which is seens
as twe0.

3dm is installed.

The box ran half a day and a night just fine. After that it was shutdown
correctly and after a couple of hours turned on.

I have heared (leds do not work due to connector incompatibility with
supermicro case) high hdd activity for some time, but all filesysrems
were marked as clean. I tried to login but i could not because after i
types 'root' at the login nothing happened at all. Just a blinking cursor.
However, the box was not hanging - screensaver appeared after some
time and i can type on tty and also swicth vttys and use scroll lock to
scroll
boot messages. 3DM did not respond via web. So, i waited 4 hours and
rebooted.

After reboot i can logon but after several requests  to RAID status via
web (3dm) i got the following on the console:

twe0: TWEIO_GET_PARAM failed for 0x402/0x3/16

Then after a minute or two the following happened:

Memory modified after free 0x788f400(508) val=20202020 _at_ 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

Is this all a twe driver problem or general 5.2-CURRENT instability?
Any ideas what happened in two cases and how to avoid it or/and
solve the problems?



Regards,
Artem Kuchin
General Director of IT Legion Ltd.
Russia, Moscow
www.itlegion.ru
matrix_at_itlegion.ru
+7 095 232-0338