6.1-stable hangs and LORs

[Bjoern A. Zeeb]

On Mon, 12 Jun 2006, Max Laier wrote:

> On Sunday 11 June 2006 23:46, Brad Waite wrote:
>> Kris Kennaway wrote:
>>> We need to know the LOR before anyone can tell what is going wrong ;-)
>>
>> Ask and you will receive:
>>
>> lock order reversal:
>>   1st 0xc077a440 pf task mtx (pf task mtx) @
>> /usr/src/sys/contrib/pf/net/pf.c:6331
>>   2nd 0xc07d3fac tcp (tcp) @ /usr/src/sys/contrib/pf/net/pf.c:2719
>
> From pf.conf(5):
> BUGS
>     Due to a lock order reversal (LOR) with the socket layer, the use of the
>     group and user filter parameter in conjuction with a Giant-free netstack
>     can result in a deadlock.  If you have to use group or user you must set
>     debug.mpsafenet to ``0'' from the loader(8), for the moment.  This work-
>     around will still produce the LOR, but Giant will protect from the dead-
>     lock.

though this is known and there are already other similar LORs (like
#17, ...) I added it to the LOR page with ID 191 because it's another
code path in the backtrace. That way people will also find this one.
 	http://sources.zabbadoz.net/freebsd/lor.html#191

-- 
Bjoern A. Zeeb				bzeeb at Zabbadoz dot NeT