[OpenAFS-devel] 1.2.10 linux kernel hang during AFS backups

[Derrick J Brashear]

On Sat, 28 Aug 2004, Joseph H. Buehler wrote:

> I am having a serious problem with 3 different AFS fileservers
> hanging during AFS backups and would appreciate some help from
> someone who knows the linux/AFS internals.  This happens every
> night basically during AFS backups on one or more of the 3
> machines.
>
> The only access to the machine when this happens is the
> Alt-SysRq keys on the console.  Below are excerpts from
> the output of Alt-SysRq-t (slightly mangled because it
> was captured with tcpdump using netconsole).  A guess
> on my part is that kswapd is deadlocked, so shown are
> the three processes in Afs_Lock_Obtain (the whole
> of the output is rather large to post).

Worse than that, I'll guess your kernel modules weren't compiled with 
--enable-debug-kernel and so the frame pointers aren't preserved.