Kernel memory corruption(?) with age(4)

[YongHyeon PYUN]

On Mon, Jun 27, 2011 at 01:50:11PM +0200, Michael Schuh wrote:
> 2011/6/26 YongHyeon PYUN <pyunyh at gmail.com>
> 
> > On Sun, Jun 26, 2011 at 06:53:57AM +0200, Michael Schuh wrote:
> > > 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.
> > >
> >
> > I think the issue was already fixed(r220249, r220252). Apply the
> > patch and rebuild your kernel after downloading it from the
> > following URL.
> >
> > http://svnweb.freebsd.org/base/head/sys/dev/age/if_age.c?r1=219902&r2=220252&view=patch
> > If you see the same issue again with this patch please let me know.
> >
> 
> Many thanks for the patch.
> i will test him later.
> 
> Just another question in relation to this:
> Got this patch applied to the stable branch?

The patch is for 8.2-RELEASE or 7.4-RELEASE.

> I plan to switch the system this week to stable.
> 

You don't have to apply the patch to stable/8. The patch was
already merged to both stable/8 and stable/7.

> thanks again.