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Date:      Sun, 25 Mar 2007 16:20:12 -0400
From:      Nicolas Blais <nb_root@videotron.ca>
To:        freebsd-current@freebsd.org
Cc:        Giorgos Keramidas <keramida@ceid.upatras.gr>
Subject:   Re: Latest -current complete lockup (tcp changes?)
Message-ID:  <200703251620.20879.nb_root@videotron.ca>
In-Reply-To: <20070325194946.GC79938@kobe.laptop>
References:  <20070324124732.GA767@nagual.pp.ru> <200703251348.58972.nb_root@videotron.ca> <20070325194946.GC79938@kobe.laptop>

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On March 25, 2007 03:49:46 pm Giorgos Keramidas wrote:
> On 2007-03-25 13:48, Nicolas Blais <nb_root@videotron.ca> wrote:
> > > The panic happens after a small amount of network activity, inside
> > > the TCP SACK code:
> > >
> > > ---------------------------------------------------------------------=
=2D-
> > >---- Disabling SACK lets me use my laptop again:
> > >
> > >     net.inet.tcp.sack.enable=3D0
> > >
> > > without any panics.
> >
> > Same here. If you want to quickly crash your system,
> > net.inet.tcp.sack.enable=3D1 and start a torrent :)
> >
> > I couldn't find what was causing my desktop to crash until I STOPPED
> > trying to restart my torrent after boot :) . Though
> > net.inet.tcp.sack.enable=3D0 fixed it.
>
> Rebuilding a kernel will take a while here.  If you can try reverting
> the following commit before I do, let me know if it fixes the panic.
>
> % andre       2007-03-23 18:33:21 UTC
> %
> %   FreeBSD src repository
> %
> %   Modified files:
> %     sys/netinet          tcp_input.c tcp_sack.c
> %   Log:
> %   Bring SACK option handling in tcp_dooptions() in line with all other
> %   options and ajust users accordingly.
> %
> %   Revision  Changes    Path
> %   1.326     +7 -4      src/sys/netinet/tcp_input.c
> %   1.35      +1 -0      src/sys/netinet/tcp_sack.c

Done.=20

I reverted tcp_input.c to 1.325 and tcp_sack.c to 1.34. I was able to start=
=20
many torrents without a panic. I believe the revert fixed the problem, as=20
previously, just starting 1 torrent would panic (unless =20
net.inet.tcp.sack.enable=3D0) , now I have 5 running fine.

Nicolas.

=2D-=20
=46reeBSD 7.0-CURRENT #18: Sun Mar 25 16:03:50 EDT 2007    =20
nicblais@clk01a:/usr/obj/usr/src/sys/CLK01A=20
PGP? : http://plaintext.clkroot.net/security/nb_root.asc

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