On Wed, 24 Nov 2010 22:34:21 +0800 Du Jun [off-list ref] wrote:

Their's no dmesg information at all before the hang. The system just 
hangs suddenly without any kernel printk or oops.

mdadm version is debian lenny version 2.6.7.2-3

I will get mdadm -E & mdadm -D informations tomorrow but I doubt they 
are useful.

Probably not, but they wouldn't hurt either.

What would really help is if you could capture the result of
    sysrq-T

which I accept might be a challenge depending on how hard the machine really
has frozen.

Also, make sure the LOCKUP_DETECTOR config options are set, and wait a few
minutes after the hand to see if something pops up.

I'll try to see if I can reproduce, but I don't have 16 disks so it may not
work.

NeilBrown

Johnson
on 2010/11/24 22:19, Mathias Burén  wrote:

quoted

Hi,

I suppose a few logs would be interesting. (dmesg, mdadm -E (hdds),
mdadm -D md10, zcat /proc/config.gz, mdadm version)

Regards,
// Mathias

2010/11/24 Du Jun[off-list ref]:
   

quoted

Hi,
We just quick tested the raid stability under the vanilla 2.6.36 kernel
and got an unstable result.

first, we create a raid5 array using 16 sata disks:

mdadm -C /dev/md10 -l 5 -n 16 /dev/sd[b-q]

then use dd to stress the io:

dd if=/dev/zero of=/dev/md10 bs=1M

After a while, usually several minutes, the system hangs. It looks like
some kind of kernel deadlock. ping to this machine could get timely
response, however, any other process just hangs.

It is easily reproducible and everytime the test result is a system hang.

Johnson

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