lock up in 6.2 (procs massively stuck in Giant)

[pluknet]

2009/5/13 John Baldwin <jhb at freebsd.org>:
> On Wednesday 13 May 2009 2:40:33 am pluknet wrote:
>> 2009/5/13 pluknet <pluknet at gmail.com>:
>> > 2009/5/13 John Baldwin <jhb at freebsd.org>:
>> >> On Tuesday 12 May 2009 4:59:19 pm pluknet wrote:
>> >>> Hi.
>> >>>
>> >>> From just another box (not from the first two mentioned earlier)
>> >>> with a similar locking issue. If it would make sense, since there are
>> >>> possibly a bit different conditions.
>> >>> clock proc here is on swi4, I hope it's a non-important difference.
>> >>>
>> >>>    18     0     0     0  LL     *Giant    0xd0a6b140 [swi4: clock sio]
>> >>> db> bt 18
>> >>
>> >> Ok, this is a known issue in 6.x.  It is fixed in 6.4.
>> >>
>>
>> Looking at the face of kern_timeout.c I suspect that was fixed in r181012.
>
> No, this particular issue is fixed by a change to sched_4bsd.c in r179975.
>

Gah.. We constrained to use ule scheduler on 6.x (yes, I know that
"it's known to be broken (c)"), since we have had a very bad interactivity
on 4bsd on our workload. Ok, that's just another reason to move to 7.x.

Thanks.

-- 
wbr,
pluknet