Re: btrfs_direct_IO oops

From: Dave Jones
Date: Mon Oct 10 2016 - 13:17:16 EST


On Mon, Oct 10, 2016 at 04:55:03PM +0100, Al Viro wrote:

> > WARNING: CPU: 1 PID: 13581 at lib/iov_iter.c:327 sanity+0x102/0x150
> > CPU: 1 PID: 13581 Comm: trinity-c17 Not tainted 4.8.0-think+ #9
> > ffffc90000963ae8
> > ffffffffb93e22d1
> > 0000000000000000
> > 0000000000000000
> >
> > ffffffffb9c1e1cb
> > ffffffffb93fa5b2
> > ffffc90000963b28
> > ffffffffb908b010
> >
> > 00000147d43c0e7f
> > ffffffffb9c1e1cb
> > 0000000000000147
> > 0000000000000010
>
> What are these from? Confused...

That's the stack I think. I don't know why it started printing all weird..

> [via splice_direct_to_actor()]
>
> Hmmm... I think I see it. Could you try the following (on top of debugging
> in lib/iov_iter.c) and see if anything triggers?

Been running for an hour without incident so far, so this looks promising.
I'll follow-up if anything jumps out, but normally I'd have seen this by now.

Dave