FreeBSD8-RC1 crashed

Hi all,

I just noticed that my XEN pv-domU based on FreeBSD8-RC1 (based on SVN
r197306) crashed with the following message:

[XEN] hypervisor wallclock nudged; nudging TOD.
[XEN] hypervisor wallclock nudged; nudging TOD.
panic: mtx_lock() of spin mutex (null) _at_ /test/usr-src/sys/net/netisr.c:830
cpuid = 0
KDB: enter: panic
[thread pid 21716 tid 100098 ]
Stopped at      kdb_enter+0x3a: movl    $0,kdb_why
db> bt
Tracing pid 21716 tid 100098 td 0xc423c900
kdb_enter(c035ddd5,c035ddd5,c035c7cd,e422d9cc,0,...) at kdb_enter+0x3a
panic(c035c7cd,0,c036da84,33e,16d,...) at panic+0x136
_mtx_lock_flags(c082d808,0,c036da84,33e,c3441d00,...) at _mtx_lock_flags+0x9a
netisr_clearqdrops(e422da28,c423c9a4,c05129d0,0) at netisr_clearqdrops+0x66e
netisr_queue_src(1,0,c3441d00,e422da6c,c01862de,...) at netisr_queue_src+0xa7
netisr_queue(1,c3441d00,c3441d48,e422daf8,e422da80,...) at netisr_queue+0x20
if_simloop(c32e9400,c3441d00,2,0,c01a2a8f,...) at if_simloop+0xfe
looutput(c32e9400,c3441d00,e422db00,e422daf8,c031ff74,...) at looutput+0x141
ip_output(c3441d00,0,0,0,0,...) at ip_output+0x9cc
tcp_output(c40c09e0,ca870340,1b9,c40be7a8,c40dc338,...) at tcp_output+0x1540
tcp_ctloutput(c40dc338,ca870340,c423c900,25,e422dc70,...) at tcp_ctloutput+0x933
soconnect(c40dc338,ca870340,c423c900,bf7fae20,ca870340,...) at soconnect+0x52
kern_connect(c423c900,6,ca870340,ca870340,ffffffff,...) at kern_connect+0xa6
connect(c423c900,e422dd08,c,c03646ed,c039d8b8,...) at connect+0x46
syscall(e422dd48) at syscall+0x2a3
Xint0x80_syscall() at Xint0x80_syscall+0x22
--- syscall (98, FreeBSD ELF32, connect), eip = 0x283b9e5b, esp = 0xbf7facbc, ebp = 0xbf7faee8 ---

Is this issue already known? I have reserved the domU state, so further
troubleshooting is not a problem.
If anyone wonders, '/test/usr-src' is '/usr/src' within a ZFS
volume ;-))

Regards,
---
Mr. Olli