Date: Mon, 19 Sep 2005 16:49:05 +0400 (MSD) From: Maxim Konovalov <maxim@macomnet.ru> To: Andre Oppermann <andre@freebsd.org> Cc: current@freebsd.org Subject: Re: sbflush_locked panic and tcp_sack Message-ID: <20050919164747.N85035@mp2.macomnet.net> In-Reply-To: <432EADC6.80908@freebsd.org> References: <20050919110006.R22597@mp2.macomnet.net> <432EADC6.80908@freebsd.org>
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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
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