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
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