Another panic (during netisr?)

Kamigishi Rei spambox at
Sat Oct 3 18:58:26 UTC 2009


On 02.10.2009 23:14, Bjoern A. Zeeb wrote:
>> This is on FreeBSD 8.0-BETA3 (Ameagari) #23 r196460: Mon Aug 24 
>> 00:36:33 JST 2009; not sure if it has been witnessed or fixed. I've 
>> been running it without restarts to test the stability and here we go:
>> Unread portion of the kernel message buffer:
>> panic: tcp_input: so == NULL
> This looks like an explicit panic unrelated to the netisr in first
> place.
> More likely a race condition with socket teardown which should not
> happen in theory;)

Oh, so it's just like that panic in tcp_sack then. ;)
I've replaced the CPU in the server (was: dual core, now: quad core) for 
even more chances for a race condition to strike; waiting for this one 
to re-appear again now on 8.0-RC1 ;) (Though 39 days of uptime was a 
pretty good result for BETA3, I can't say I'm satisfied, as I have yet 
to see my 7.2-STABLE server panic; 39 days is not impressive when it 
comes to production use including running ircd for a large network.)

I do indeed hope that it will never happen again.

Kamigishi Rei

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