Ref. <http://docs.FreeBSD.org/cgi/mid.cgi?20150415134515.GQ1224> --
similar symptoms.  And again, I captured screenshots on a phone, but
FreeBSD doesn't seem to recognize the (USB-attached) phone as something
that might act like a file system (I guess; I'm a bit new to
"smartphones").

In this case, my starting-point was r282623; sources were updated to
r282676.  I was able to update from:

FreeBSD g1-254.catwhisker.org 11.0-CURRENT FreeBSD 11.0-CURRENT #55  
r282623M/282623:1100072: Fri May  8 05:40:49 PDT 2015     
r...@g1-254.catwhisker.org:/common/S3/obj/usr/src/sys/CANARY  amd64

to

FreeBSD g1-254.catwhisker.org 11.0-CURRENT FreeBSD 11.0-CURRENT #56  
r282676M/282676:1100073: Sat May  9 05:50:15 PDT 2015     
r...@g1-254.catwhisker.org:/common/S3/obj/usr/src/sys/CANARY  amd64

without incident, but the update from:

FreeBSD g1-254.catwhisker.org 11.0-CURRENT FreeBSD 11.0-CURRENT #1590  
r282623M/282623:1100072: Fri May  8 06:40:11 PDT 2015     
r...@g1-254.catwhisker.org:/common/S4/obj/usr/src/sys/CANARY  i386

was only able to build; the panic occurs before we've found any disks,
so I can't get a crash dump.  I do have a kdb prompt, though, so if
someone has a suggestion for something to check, please let me know.
(Mind, reading email will be rather awkward while the laptop is exploring
the mysteries of a panic, so that might be worth bearing in mind.)

Just prior to the bactrace, I see:
...
hdaa1: 30 411111f0 15 0  Speaker       None   1/8      Rear
Kernel page fault with the following non-sleepable locks held:
exclusive sleep mutex hdac1 (HDA driver mutex) r = 0 (0xcfef...
src/sys/dev/sound/pci/hda/hdaa.c:1571

The most recent relevant entries in the backtrace are:
hdaa_configure()
hdaa_attach()
device_attach()
bus_generic_attach()
hdacc_attach()
device_attach()
bus_generic_attach()
hdac_attach2()
run_interrupt_driven_config_hooks()
boot_interrupt_driven_config_hooks()
mi_startup()
begin()

The panic message is "fatal trap 12: page fault while in kernel mode"
...
fault code              = supervisor read, page not present
...
current process         = 0 (swapper)
...
Stopped at ... = hdaa_configure+0x14af: movb    0x3,%dl


The only commit I see in the range from r282623 - r282676 that looks
as if it might be implicated to me is r282650, but I don't see anything
glaringly obvious.

Peace,
david
-- 
David H. Wolfskill                              da...@catwhisker.org
Those who murder in the name of God or prophet are blasphemous cowards.

See http://www.catwhisker.org/~david/publickey.gpg for my public key.

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