[Bug 210801] [panic] Fatral trap 12: page fault while in kernel mode (new in 11.0-ALPHA6 from 11.0-ALPHA3)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=210801

            Bug ID: 210801
           Summary: [panic] Fatral trap 12: page fault while in kernel
                    mode (new in 11.0-ALPHA6 from 11.0-ALPHA3)
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Keywords: regression
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: junovitch at freebsd.org
                CC: jhb at FreeBSD.org, kib at FreeBSD.org

Possible regression between ALPHA3 and ALPHA6. It's happened randomly while
doing some Poudriere runs and going back and forth at the console testing
ports.   Sadly I do not have a replication case just yet but have had two
panics since updating Friday.

- Before
FreeBSD 11.0-ALPHA3 #0 r301817M: Sat Jun 11 08:34:23 UTC 2016

- After
FreeBSD 11.0-ALPHA6 #0 r302303M: Fri Jul  1 04:55:24 UTC 2016

- Changes for the 'M'
M       share/man/man4/coretemp.4
M       sys/dev/coretemp/coretemp.c

- Excerpt from core:
...
#0  doadump (textdump=0) at pcpu.h:221
221     pcpu.h: No such file or directory.
        in pcpu.h
(kgdb) #0  doadump (textdump=0) at pcpu.h:221
#1  0xffffffff8039beab in db_dump (dummy=<value optimized out>, dummy2=false, 
    dummy3=0, dummy4=0x0) at /usr/src/head/sys/ddb/db_command.c:533
#2  0xffffffff8039bca9 in db_command (cmd_table=<value optimized out>)
    at /usr/src/head/sys/ddb/db_command.c:440
#3  0xffffffff8039ba04 in db_command_loop ()
    at /usr/src/head/sys/ddb/db_command.c:493
#4  0xffffffff8039e9eb in db_trap (type=<value optimized out>, 
    code=<value optimized out>) at /usr/src/head/sys/ddb/db_main.c:251
#5  0xffffffff80b323d3 in kdb_trap (type=<value optimized out>, 
    code=<value optimized out>, tf=<value optimized out>)
    at /usr/src/head/sys/kern/subr_kdb.c:654
#6  0xffffffff80fd52d1 in trap_fatal (frame=0xfffffe0469f087e0, eva=1036)
    at /usr/src/head/sys/amd64/amd64/trap.c:836
#7  0xffffffff80fd5503 in trap_pfault (frame=0xfffffe0469f087e0, usermode=0)
    at /usr/src/head/sys/amd64/amd64/trap.c:691
#8  0xffffffff80fd4aac in trap (frame=0xfffffe0469f087e0)
    at /usr/src/head/sys/amd64/amd64/trap.c:442
#9  0xffffffff80fb7ba1 in calltrap ()
    at /usr/src/head/sys/amd64/amd64/exception.S:236
#10 0xffffffff80a9164c in filt_proc (kn=0xfffff800918b6900, 
    hint=<value optimized out>) at /usr/src/head/sys/kern/kern_event.c:473
#11 0xffffffff80a8fbad in knote (list=<value optimized out>, hint=2147483648, 
    lockflags=<value optimized out>)
    at /usr/src/head/sys/kern/kern_event.c:2045
#12 0xffffffff80a96dad in exit1 (td=0xfffff8023875a000, rval=184783104, 
    signo=0) at /usr/src/head/sys/kern/kern_exit.c:515
#13 0xffffffff80a95ddd in sys_sys_exit (td=0xfffff800918b6900, 
    uap=<value optimized out>) at /usr/src/head/sys/kern/kern_exit.c:178
#14 0xffffffff80fd5c6e in amd64_syscall (td=<value optimized out>, traced=0)
    at subr_syscall.c:135
#15 0xffffffff80fb7e8b in Xfast_syscall ()
    at /usr/src/head/sys/amd64/amd64/exception.S:396
#16 0x000000080092a8ca in ?? ()
Previous frame inner to this frame (corrupt stack?)
Current language:  auto; currently minimal

Given the filt_proc/knote mentions, CC the folks from
https://reviews.freebsd.org/D6859 (r302235) as a best guess looking at the SVN
log for guidance.
(kgdb)

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