Date: Mon, 19 Sep 2005 14:23:34 +0200 From: Andre Oppermann <andre@freebsd.org> To: Maxim Konovalov <maxim@macomnet.ru> Cc: current@freebsd.org Subject: Re: sbflush_locked panic and tcp_sack Message-ID: <432EADC6.80908@freebsd.org> In-Reply-To: <20050919110006.R22597@mp2.macomnet.net> References: <20050919110006.R22597@mp2.macomnet.net>
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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.
--
Andre
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