non-blocking connect and EAGAIN

Hello!
I got a lot of mysql errors "Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (11)".

I trace one of this error and see, what non-blocking connect return EAGAIN. See:
fcntl64(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0 connect(3, {sa_family=AF_FILE, path="/var/lib/mysql/mysql.sock"}, 110) =
-1 EAGAIN (Resource temporarily unavailable)

Mysql's connect do not detect this error:

   if ((res != 0) && (s_err != EINPROGRESS))    {

     errno= s_err;                       /* Restore it */
     return(-1);

Is this kernel bug (Linux 2.6.16-std26-smp-alt1)?... which return EAGAIN instead of EINPROGRESS, or some other troubles can force EAGAIN on unix socket connect?

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