FreeBSD 7.1-PRERELEASE panic rw_rlock (udpinp)

[Kris Kennaway]

Mario Sergio Fujikawa Ferreira wrote:
> On Sun, Sep 21, 2008 at 11:48:19AM +0100, Kris Kennaway wrote:
>> Mario Sergio Fujikawa Ferreira wrote:
>>> Hi,
>>>
>>>   I've been running FreeBSD 7.0-STABLE from August 1 without problems.
>>>
>>>   I tried updating to the latest -STABLE but I got a system panic.
>>>
>>> ----
>>> panic: _rw_rlock (udpinp): wlock already held @ /usr/src/sys/netinet/udp_usrreq.c
>>> ----
>>>
>>> FreeBSD 7.1-PRERELEASE #18: Sat Sep 20 23:38:22 BRT 2008
>>>
>>> 	Regards,
>>> 		Mario Ferreira
>>>
>>> ----
>>>
>>> - Kernel configuration
>>> http://people.freebsd.org/~lioux/panic/2008092100/KERNCONF
>>>
>>> - syslog output
>>> http://people.freebsd.org/~lioux/panic/2008092100/all.log
>>> http://people.freebsd.org/~lioux/panic/2008092100/messages
>>>
>>> - dmesg.boot
>>> http://people.freebsd.org/~lioux/panic/2008092100/dmesg.boot
>>>
>>> - kldstat
>>> http://people.freebsd.org/~lioux/panic/2008092100/kldstat.txt
>>>
>>> - /boot/loader.conf
>>> http://people.freebsd.org/~lioux/panic/2008092100/loader.conf
>>>
>>> - 'pciconf -lv'
>>> http://people.freebsd.org/~lioux/panic/2008092100/pciconf.txt
>>>
>>> - 'sysctl -a'
>>> http://people.freebsd.org/~lioux/panic/2008092100/sysctl.txt
>>>
>>> - /etc/sysctl.conf
>>> http://people.freebsd.org/~lioux/panic/2008092100/sysctl.conf
>>>
>> - gdb backtrace?
> 
> 	I had a hard lock there. I got the system panic but it
> locked instead of dumping core. I had to remove the power cord to
> reboot it.
> 
> 	I do not have much experience with kernel traces. How do I
> force a backtrace? Any unattended ddb scripts?

See the developers handbook.

Kris