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Re: amd64 -current panics

Panics the same way, unfortunately. I was thinking of bisecting between 17th and 27th of November; the src tree gets screwed after this panic (I guess bad spot into the cvs update), so I have to recover from scratch. 

Chavdar Ivanov

On Sat, 3 Dec 2016 at 12:01 Michael van Elst <> wrote: (Chavdar Ivanov) writes:

>#6  0xffffffff801529b9 in scsipi_done ()
>#7  0xffffffff8043d5fe in mpt_drain_queue ()
>#8  0xffffffff8043dccd in mpt_intr ()

>sd1: busy < 0
>panic: iostat_unbusy

Every I/O request increments a busy counter when issued to the controller
and decrements the busy counter when completed.

Somehow the counter went negative, probably because the code now
runs outside of the big kernel lock.

Can you try the following patch to see wether it stops the panic?

--- sd.c.ORIG   2016-12-03 13:02:24.000000000 +0100
+++ sd.c.NEW    2016-12-03 13:03:02.000000000 +0100
@@ -966,8 +966,10 @@
                        bp->b_resid = bp->b_bcount;

+               KERNEL_LOCK(1, NULL);
                disk_unbusy(&sd->sc_dk, bp->b_bcount - bp->b_resid,
                    (bp->b_flags & B_READ));
+               KERNEL_UNLOCK_ONE(NULL);
                rnd_add_uint32(&sd->rnd_source, bp->b_rawblkno);


                                Michael van Elst
                                "A potential Snark may lurk in every tree."

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