panic: mutex Giant not owned
at /usr/src/sys/kern/tty_ttydisc.c:1127
Julian Elischer
julian at elischer.org
Sun Jan 25 00:40:32 PST 2009
Alfred Perlstein wrote:
> * Maksim Yevmenkin <maksim.yevmenkin at gmail.com> [090124 01:38] wrote:
>> from what i can see you are _NOT_ using _SPIN_ mutexes (aka spin
>> locks). you are using regular mutexes. let me quote locking(9) man
>> page
>>
>> "
>> Mutexes
>> Basically (regular) mutexes will deschedule the thread if the mutex can
>> not be acquired. A non-spin mutex can be considered to be equivalent to
>> getting a write lock on an rw_lock (see below),
>> "
>>
>> so, if thread can not get mutex it will be descheduled. this
>> absolutely can not happen in netgraph!
>
>>From a purely academic standpoint... why can't netgraph use
> standard mutexes?
>
> Is there a pointer you can give me?
see my later post..
it can, but you really want to be sure that you know who you are
contending with..
>
> -Alfred
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