Date: Mon, 26 Mar 2007 00:47:54 +0200 From: Andre Oppermann <andre@freebsd.org> To: Giorgos Keramidas <keramida@freebsd.org> Cc: freebsd-current@freebsd.org, Nicolas Blais <nb_root@videotron.ca> Subject: Re: Latest -current complete lockup (tcp changes?) Message-ID: <4606FC1A.3090009@freebsd.org> In-Reply-To: <20070325202749.GA1503@kobe.laptop> References: <20070324124732.GA767@nagual.pp.ru> <200703251348.58972.nb_root@videotron.ca> <20070325194946.GC79938@kobe.laptop> <200703251620.20879.nb_root@videotron.ca> <20070325202749.GA1503@kobe.laptop>
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Giorgos Keramidas wrote: > Hi Andre, > > The attached thread below is a reply from Nicolas Blais which shows some > problems with the recent SACK changes. Any idea how we can proceed from > this point? I'm looking into it and have got a good backtrace from Wojciech too. -- Andre > - Giorgos > > On 2007-03-25 16:20, Nicolas Blais <nb_root@videotron.ca> wrote: >> 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: >>>>> >>>>> ----------------------------------------------------------------------- >>>>> ---- Disabling SACK lets me use my laptop again: >>>>> >>>>> net.inet.tcp.sack.enable=0 >>>>> >>>>> without any panics. >>>> Same here. If you want to quickly crash your system, >>>> net.inet.tcp.sack.enable=1 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=0 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. >> >> I reverted tcp_input.c to 1.325 and tcp_sack.c to 1.34. I was able to start >> many torrents without a panic. I believe the revert fixed the problem, as >> previously, just starting 1 torrent would panic (unless >> net.inet.tcp.sack.enable=0) , now I have 5 running fine. >> >> Nicolas. > >
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