hi,

> > > Are you using lfs? The deadlock occurred to me when I tried to extract
> > > a very large tarball on a lfs volume. Kernels between 2/14 and
> > > yesterday have the same problem. What's odd is, the same thing was okay
> > > with a ffs (+softdep) partition.
> > >
> > > Jun-Young
> >
> > do you have a backtrace?
> 
> No, the kernel spitted off tons of the same message
> 
> pagedaemon: deadlock detected!

i don't think buf_drain() causes this for lfs because
lfs's VOP_BWRITE merely "lock" the buffer.
although lfs have other problems. :)

> and died with
>
> panic: psignal: Invalid process state1

there's another PR for this.  kern/24452.

YAMAMOTO Takashi