Re: kernel BUG at kernel/timer.c:748!

On Mon, 2012-09-24 at 11:39 -0400, Dave Jones wrote:

On Wed, Sep 19, 2012 at 10:02:23PM -0400, Dave Jones wrote:
 > On Thu, Sep 20, 2012 at 12:01:22AM +0200, Eric Dumazet wrote:
 > 
 >  > I spent some time trying to track this bug, but found nothing so far.
 >  > 
 >  > The timer->function are never cleared by TCP stack at tear down, and
 >  > should be set before fd is installed and can be caught by other threads.
 >  > 
 >  > Most likely its a refcounting issue...
 >  > 
 >  > Following debugging patch might trigger a bug sooner ?
 > 
 > 4 hours so far, nothing.. I'll leave it run overnight, but it doesn't seem to have
 > made much difference if any.

One of my over-weekend runs hit this again, but it didn't trigger the WARN that
your patch added :-/

	Dave

OK, I believe I found the reason. I Will post a patch.

open a raw socket AF_INET, TCP_PROTO
+ connect() ->sk_state set to TCP_ESTABLISHED
+ setsockopt( SO_KEEPALIVE, &on)  -> crash


Thanks