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port-xen/46057: NetBSD/Xen DOM-U crash

>Number:         46057
>Category:       port-xen
>Synopsis:       NetBSD/Xen DOM-U crash
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    port-xen-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Feb 20 07:55:00 +0000 2012
>Originator:     dieter roelants
>Release:        6.0_BETA
NetBSD netbsd-u2.inflamm 6.0_BETA NetBSD 6.0_BETA (SIMULT.domu) #15: Sat Feb 18 
19:16:16 CET 2012  
dieter@netbsd-u2.inflamm:/build/obj/sys/arch/amd64/compile/SIMULT.domu amd64

I had a Xen guest crash like this:

uvm_fault(0xffffa000034dea50, 0x0, 1) -> e
fatal page fault in supervisor mode
trap type 6 code 0 rip ffffffff801d0c8e cs e030 rflags 10246 cr2  0 cpl 0 rsp 
kernel: page fault trap, code=0
Stopped in pid 383.1 (tmux) at  netbsd:sysctl_doeproc+0xd63:    movq    0(%rax),
sysctl_doeproc() at netbsd:sysctl_doeproc+0xd63
sysctl_dispatch() at netbsd:sysctl_dispatch+0xb2
sys___sysctl() at netbsd:sys___sysctl+0xeb
syscall() at netbsd:syscall+0xc4
ds          1298
es          c2f0
fs          1000
gs          d7c0
rdi         0
rsi         ffffffff8033950d    copyright+0x422d
rbp         ffffa00044d07ad0
rbx         ffffa0000375d7c0
rdx         0
rcx         ffffa000095a1298
rax         0
r8          2
r9          ffffa000095a10ac
r10         1f00000014
r11         0
r12         ffffa000095a1000
r13         2a8
r14         ffffa00009725900
r15         ffffa000037645a0
rip         ffffffff801d0c8e    sysctl_doeproc+0xd63
cs          e030
rflags      10246
rsp         ffffa00044d078f0
ss          e02b
netbsd:sysctl_doeproc+0xd63:    movq    0(%rax),%rdx

The kernel config is XEN3_DOMU, with some compat options, file systems, pseudo 
devices disabled, and (unfortunately) also without DIAGNOSTIC, DEBUG. 
MULTIPROCESSOR is enabled, but the machine has but one vcpu.
It only happened once, so far. The machine was building pkgsrc stuff in a tmux. 
There's a good chance the crash happened when I detached the tmux.

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