Re: Lockup with 2.4.9-ac9

[Alan Cox]

> I upgraded a server from 2.4.4-ac10 to 2.4.9-ac9 two days ago and I've
> been having problems with it since then (reverted to the old but working
> 2.4.4-ac10 for now).
> 
> The machine simply locks up and doesn't say a word, no Oops or
> anything, looks like a deadlock. 
> This happened 4 times yesterday and every time there was one user that was
> uploading a lot of data (a few GB) in quite high speeds to this LV.

The -ac tree has the LVM 1.0 code which is very new and updated reiserfs
code. That makes the combination trickier to debug. When it hangs do the
keyboard lights still work ? (that tells me if it hung irq off or on). In
the latter case enabling the NMI watchdog, and sysrq key may give useful
traces

Alan