Kernel memory corruption(?) with age(4)

[Michael Schuh]

Hi,

i am not on the list atm.

i found this entry after digging in google during problems with a normally
rock stable
system ( under linux).

I can also confirm the behaviour from the first post.
After a long hard night digging in the system and changing some options
i found a repeatable way to crash the system ultrafast.

at the initial crashes the system crashed after copying around 800GB.
the second and third and further attempts/impacts got issued everytime
after an  ~ hour from reboot on. leaving the system withouth any power,
changing some hardware
forth and back didn't changed anything, except the network card.

a happening beside that: immediatly after the initial boot will get the
ntpdate and ntpd started.
by this, the ntpd complains about unsresolveable hostnames from ntp.conf.
if you log in and restart the ntpd by hand, everything is fine, no
complains,
no unresolveable hostnames.
the hostnames are well known and tested and the DNS works still fine.
this happening will also leave if you change the Ethernet-adapter to an
Intel Card.

My system crashed so fast that i didn't got any log entry nor a crashdump.

my last try's crashed my system after 100 - 120 seconds.

HW: AMD P5K with Atheros age-Interface enabled, 6GB Corsair DDR2 800MHZ
(pc6400) RAM ( latency 5-5-5-5-18)
Ati Radeon HD4350 with 512MB Onboard Memory, 3 disks 2 PATA, 1 SATA.

OS: FreeBSD/amd64 8.2-RELEASE ( unmodified original RELEASE install )

REQUIREMENTS to repeat the issue:
box A: a stable FreeBSD or Linux Box with GBitEthernet interface and no
essential networkload
box B: the affected FreeBSD Host with the age interface.

the age0 interface is configured with default options.
only the ip-configuration got applied through rc.conf

ifconfig_age0="192.168.1.3 netmask 255.255.255.0"

PROCEDURE:
On Box A ( p.e IP: 192.168.1.2 )  issue the command:

# dd if=/dev/zero |nc -l -p 1666

On Box B issue a complementary command like:

# nc 192.168.1.2 1666| dd of=/dev/null

I am sorry i cannot test a patch at this time cause this is a backup server,
that has to get asap into production.
After disabling the age-Interface in the bios settings and inserting a Intel
GBit NIC the System runs stable again.

i hope this informations will help a bit.
if you need to message me, please message me directly cause i am not
registered for this list.

thank you

greetings

m.



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Michael Schuh
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