Re: [TCP bug] stuck distcc connections in latest -git

From: Willy Tarreau
Date: Tue Jul 22 2008 - 17:14:49 EST

On Tue, Jul 22, 2008 at 05:34:43PM +0200, Ingo Molnar wrote:
> * David Newall <davidn@xxxxxxxxxxxxxxx> wrote:
> > Ingo Molnar wrote:
> > > * David Newall <davidn@xxxxxxxxxxxxxxx> wrote:
> > >
> > >> You really should start that capture, and on both client and server.
> > >> You don't need to dump everything, only traffic to or from
> > >> server:distcc.
> > >>
> > >
> > > It's not feasible. That box did in excess of 200 GB of network traffic
> > > in the past 7 hours alone.
> >
> > You only need distcc traffic, and perhaps only after it's hung. With
> > 250k outstanding per socket, are you certain that no traffic was sent?
> > Is it certain that one packet wasn't being sent each three minutes? I
> > suppose you're right and the stack really is stuck, but this is such
> > an easy thing to check and eliminate that you should do so. I
> > suppose, too, that you should trace the server-side processes and
> > confirm that they are waiting for socket input. You should dump tcp
> > (for the distcc port) next time the problem recurs and also check that
> > the server processes are waiting for socket input.
> ok, will do that if it happens again.


if it can help, I have a "capture" script which allows you to define
a size and will rotate captures within that size. That's what I'm
using to troubleshoot rarely occuring problems in datacenters, so
it's horrible but efficient :-)

You just have to stop it once the problem has happened again. Ping
me if you're interested (I'm lazy to start my laptop right just for
it now in fact).


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