[dm-devel] Development problem: uninterruptable processes

[Anselm Busse]

Hello everyone,

I am not sure whether I am right in this mailing list or not, but I hope
so...

I am relative new to kernel development and especially to the device mapper.
Currently I am developing a driver using the device mapper API. It works
perfectly with one exception. After some time of heavy load every process
that tries to access the mapped block device gets stuck in the
uninterruptable state.

I already checked every entry and callback routine in my driver, but it gets
not stuck there. I also checked every lock I am using in my driver and every
one of them gets released properly. I am pretty stuck at the moment, because
I don't know where to look else for the problem and was hoping that some one
of you might have experienced similar problems or an idea where to look for
it. 
I don't know if it is important but I've noticed (using the kernel debug
option for detecting hung tasks) that every process seems to hang in a write
call and I've tried kernel versions 2.6.31 and 2.6.33.

I would appreciate every bit of help because I am completely out of ideas!

Regards, Anselm