On May 28, 2018, at 8:08 AM, Igor Kozhukhov <[email protected]> wrote:
> 
> i have panic with these changes:

As I said, I don’t have an Illumos system (nor time to set one up for the next
couple of weeks).  However, I have no idea where those warning messages are
coming from.  I presume via memory management code that we in FreeBSD
don’t have.

That said:

> panic[cpu8]/thread=fffffe0040c0fc40:
> Deadlock: cycle in blocking chain
> 
> 
> fffffe0040c0f0b0 genunix:process_type+1f275f ()
> fffffe0040c0f120 unix:mutex_vector_enter+3bf ()
> fffffe0040c0f170 zfs:vdev_queue_change_io_priority+62 ()
> fffffe0040c0f1d0 zfs:zio_change_priority+a5 ()
> fffffe0040c0f230 zfs:zio_change_priority+7a ()
> fffffe0040c0f290 zfs:zio_change_priority+7a ()
> fffffe0040c0f2f0 zfs:zio_change_priority+7a ()

that’s a very strange stack, since it looks recursive.  Yay optimizer.

I can simply revert the last patch, which added the priority changes,
and that may be for the best if nobody knows why the panic happened.

Thanks,

Sean.


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