INFO: task snmpd:398 blocked for more than 120 seconds.

[Joakim Tjernlund]

>
> > I can't make out what is causing this hang every now an then:
> >
> > INFO: task snmpd:398 blocked for more than 120 seconds.
>
> My problem with that 'error' message is that there is no way
> for a driver to disable it on a per-process basis.
> We have some processes whose 'normal state' is to sleep
> uninterruptibly in the kernel. Shutdown is handled by
> an explicit request (not by sending a signal).
> The processes could be kernel worker threads (except that
> is is ~impossible to handle them exiting from a loadble
> kernel module) so are actually children of a daemon sat
> inside an ioctl() request that never terminates!
>
> However, on the face of it, your case does look as though
> the mutex is fubar'ed.
>
> Might be worth (somehow) dumping the mutex state.

ehh, it is locked, isn't it? How to find who locked it
and forgot to release it?

       Jocke