panic on close of /dev/xen/evtchn

[Steven Hartland]

Just had my test box panic while doing a:
find / -print0 | xargs -0 cat

Ignoring the fact thats a silly command to run, the
panic appears to be when it ran:
cat /dev/xen/evtchn

On the session it then printed:
cat: /dev/xen/evtchn: Interrupted system call

At this point the system paniced.

Panic transcribed from screen is:

Stopped at evtchn_close:0x67:   lock bts| %ebx,0xa00(%rax)

db> bt
Tracing pdi 1533 tid 100370 td 0xfffff8000796e920
evtchn_close() at evtchn_close+0x67/frame ...
devfs_close() at devs_close+0x188/frame ...
VOP_CLOSE_APV() at VOP_CLOSE_APV+0x139/frame ...
vn_close() at vn_close+0x139/frame ...
vn_closefile() at vn_closefile+0x48/frame ...
_fdrop() at _fdrop+0x29/frame ...
closef() at closef+0x1d1/frame ...
closefp() at closefp+0xa0/frame ...
amd64_syscall() at amd64_syscall+0x265/frame ...
Xfast_syscall() at Xfast_syscall+0xfb/frame ...
--- syscall (6, FreeBSD ELF64, sys_close), rip = 0x80094a9ea, rsp = 0x7ffffffb8e28, rbp -= 0x7ffffffb8f70 ---

    Regards
    Steve

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