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Date: Mon, 19 Sep 2005 16:49:05 +0400 (MSD)
From: Maxim Konovalov <maxim@macomnet.ru>
To: Andre Oppermann <andre@freebsd.org>
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Cc: current@freebsd.org
Subject: Re: sbflush_locked panic and tcp_sack
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On Mon, 19 Sep 2005, 14:23+0200, Andre Oppermann wrote:

> Maxim Konovalov wrote:
> > Hi,
> >
> > I got a panic at the end of sbflush_locked() on recent -current when
> > open a large photo gallery with firefox.
> >
> > if (sb->sb_cc || sb->sb_mb || sb->sb_mbcnt)
> >                 panic("sbflush_locked: cc %u || mb %p || mbcnt %u",
> >                 sb->sb_cc,
> >    (void *)sb->sb_mb, sb->sb_mbcnt);
> >
> > It seems I can reproduce this panic easily.  Moreover, turning
> > tcp_sack off eliminates this panic.  Does anybody see that?
> >
> > http://maxim.int.ru/stuff/panic/SONNIE
> > http://maxim.int.ru/stuff/panic/kgdb.typescript
> > http://maxim.int.ru/stuff/panic/sysctl-a
>
> This rings a bell.  Sounds like a problem with delayed header drop in TCP
> segments.  In tcp_input() have the variable "tlen" examined.

Well, there is no tcp_input() in the backtrace.

-- 
Maxim Konovalov