Today's RELENG_5_4 and 'lock cmpxchgl'

[Philippe PEGON]

Kris Kennaway a écrit :
> On Fri, Jul 01, 2005 at 03:03:35PM +0200, Marc Olzheim wrote:
> 
>>On Fri, Jul 01, 2005 at 12:41:39PM +0200, Marc Olzheim wrote:
>>
>>>On Fri, Jul 01, 2005 at 12:14:58PM +0200, Marc Olzheim wrote:
>>>
>>>>Somehow, this sounds familiar, i.e.: the "lock cmpxchgl":
>>>>
>>>>Fatal trap 12: page fault while in kernel mode
>>>
>>>...
>>>
>>>>Stopped at      0xc05160c3 = knote+0x27:        lock cmpxchgl   %ecx,0x1c(%edx)
>>>
>>>Somehow I think I solved this last time by activating 'INVARIANTS'...
>>>I'll try that now.
>>
>>Let's paraphrase:
>>
>>I think i solved this last time by activating 'INVARIANTS'...
>>
>>Anyway, tried that and yes, it didn't crash in the last few hours, so I
>>guess it works. Without INVARIANTS, it crashed within seconds.
>>
>>On the downside, my Gigabit performance dropped from 99 MB/sec to 80
>>MB/sec because of INVARIANTS.
> 
> 
> The panic appears to be an instance of a known bug in 5.4 (and
> INVARIANTS will not fix it, but may just delay the inevitable by
> changing timings).  See Doug White's recent emails which point to a
> patch you should test.

If you think about this mail :

http://lists.freebsd.org/mailman/htdig/freebsd-stable/2005-June/016165.html

and follow the thread, you will see that this patch doesn't solve the problem.
The last mail which I can see from doug white about this problem is :

http://lists.freebsd.org/mailman/htdig/freebsd-stable/2005-June/016495.html

for the moment, it seems that there is no solution for 5.x

> 
> Kris

--
Philippe PEGON