[Bug 215000] webcamd panic

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=215000

            Bug ID: 215000
           Summary: webcamd panic
           Product: Base System
           Version: 11.0-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: mexas at bris.ac.uk
                CC: freebsd-amd64 at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org

Created attachment 177600
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=177600&action=edit
core.txt

FreeBSD 11.0-RELEASE-p2 #0: Mon Oct 24 06:55:27 UTC 2016
    root at amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC amd64

# cat /boot/loader.conf 
if_iwm_load="YES"
iwm3160fw_load="YES"
iwm7260fw_load="YES"
iwm7265fw_load="YES"
linux_load="YES"
cuse4bsd_load="YES"

Panics every time when webcamd_enable="YES" is added to
rc.conf. If webcamd is started manually, panic does not happen
immediately, and for a while the camera works, checked with pvcview.

See core.txt.7 attached.

Briefly:

Fatal trap 12: page fault while in kernel mode
cpuid = 2; apic id = 02
fault virtual address   = 0x100000019
fault code              = supervisor read data, page not present
instruction pointer     = 0x20:0xffffffff80b4392e
stack pointer           = 0x28:0xfffffe0234b714f0
frame pointer           = 0x28:0xfffffe0234b71540
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 378 (webcamd)
trap number             = 12
panic: page fault
cpuid = 2
KDB: stack backtrace:
#0 0xffffffff80b24077 at kdb_backtrace+0x67
#1 0xffffffff80ad93e2 at vpanic+0x182
#2 0xffffffff80ad9253 at panic+0x43
#3 0xffffffff80fa0d51 at trap_fatal+0x351
#4 0xffffffff80fa0f43 at trap_pfault+0x1e3
#5 0xffffffff80fa04ec at trap+0x26c
#6 0xffffffff80f84141 at calltrap+0x8
#7 0xffffffff82581318 at cuse_server_close+0x178
#8 0xffffffff80985a35 at devfs_close+0x5e5
#9 0xffffffff8110ade9 at VOP_CLOSE_APV+0x89
#10 0xffffffff80bbdcce at vn_close+0x13e
#11 0xffffffff80bbc77a at vn_closefile+0x4a
#12 0xffffffff8098665c at devfs_close_f+0x2c
#13 0xffffffff80a735ca at _fdrop+0x1a
#14 0xffffffff80a770a4 at closef+0x2d4
#15 0xffffffff80a76b3d at fdescfree_fds+0x7d
#16 0xffffffff80a766f2 at fdescfree+0x6a2
#17 0xffffffff80a8855a at exit1+0x73a

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