--- Comment #10 from ---

As requested in freebsd-xen mailing list:

this is from a core dumb after reboot (saved to /var/crash)

KDB: stack backtrace:
#0 0xffffffff8095b070 at kdb_backtrace+0x60
#1 0xffffffff8091f765 at panic+0x155
#2 0xffffffff80d1ee1f at trap_fatal+0x38f
#3 0xffffffff80d1f138 at trap_pfault+0x308
#4 0xffffffff80d1e79a at trap+0x47a
#5 0xffffffff80d044b2 at calltrap+0x8
#6 0xffffffff80802804 at xn_intr+0x74
#7 0xffffffff808f257b at intr_event_execute_handlers+0xab
#8 0xffffffff808f29c6 at ithread_loop+0x96
#9 0xffffffff808f019a at fork_exit+0x9a
#10 0xffffffff80d049ee at fork_trampoline+0xe
Uptime: 54s
Dumping 77 out of 727 MB:..21%..42%..63%..83%

#0  doadump (textdump=<value optimized out>) at pcpu.h:219
219     pcpu.h: No such file or directory.
        in pcpu.h
(kgdb) i li *xn_intr+0x74
Line 1209 of "/usr/src/sys/dev/xen/netfront/netfront.c"
   starts at address 0xffffffff808027fc <xn_intr+108>
   and ends at 0xffffffff80802809 <xn_intr+121>.
Current language:  auto; currently minimal

If relevant bt:
(kgdb) bt
#0  doadump (textdump=<value optimized out>) at pcpu.h:219
#1  0xffffffff8091f3e2 in kern_reboot (howto=260)
    at /usr/src/sys/kern/kern_shutdown.c:452
#2  0xffffffff8091f7a4 in panic (fmt=<value optimized out>)
    at /usr/src/sys/kern/kern_shutdown.c:759
#3  0xffffffff80d1ee1f in trap_fatal (frame=<value optimized out>, 
    eva=<value optimized out>) at /usr/src/sys/amd64/amd64/trap.c:865
#4  0xffffffff80d1f138 in trap_pfault (frame=0xfffffe00002b2920, 
    usermode=<value optimized out>) at /usr/src/sys/amd64/amd64/trap.c:676
#5  0xffffffff80d1e79a in trap (frame=0xfffffe00002b2920)
    at /usr/src/sys/amd64/amd64/trap.c:440
#6  0xffffffff80d044b2 in calltrap ()
    at /usr/src/sys/amd64/amd64/exception.S:236
#7  0xffffffff80800c82 in xn_txeof (np=0xfffffe00009e4000)
    at /usr/src/sys/dev/xen/netfront/netfront.c:1137
#8  0xffffffff80802804 in xn_intr (xsc=0xfffffe00009e4000)
    at /usr/src/sys/dev/xen/netfront/netfront.c:1209
#9  0xffffffff808f257b in intr_event_execute_handlers (
    p=<value optimized out>, ie=0xfffff800025db700)
    at /usr/src/sys/kern/kern_intr.c:1264
#10 0xffffffff808f29c6 in ithread_loop (arg=0xfffff800025d5520)
    at /usr/src/sys/kern/kern_intr.c:1277
#11 0xffffffff808f019a in fork_exit (
---Type <return> to continue, or q <return> to quit---
    callout=0xffffffff808f2930 <ithread_loop>, arg=0xfffff800025d5520, 
    frame=0xfffffe00002b2c00) at /usr/src/sys/kern/kern_fork.c:996
#12 0xffffffff80d049ee in fork_trampoline ()
    at /usr/src/sys/amd64/amd64/exception.S:611
#13 0x0000000000000000 in ?? ()

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