netdev - Re: tcp assertion failures in 2.6.24-rc4-mm1

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Date:	Sun, 9 Dec 2007 23:11:34 +0200 (EET)
From:	"Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Netdev <netdev@...r.kernel.org>
Subject: Re: tcp assertion failures in 2.6.24-rc4-mm1

On Sun, 9 Dec 2007, Andrew Morton wrote:

> 
> This is a mac g5.  It is being used as a distcc server across the LAN
> when...
> 
> windfarm: CPUs control loops started.
> EXT3-fs: INFO: recovery required on readonly filesystem.
> EXT3-fs: write access will be enabled during recovery.
> kjournald starting.  Commit interval 5 seconds
> EXT3-fs: recovery complete.
> EXT3-fs: mounted filesystem with ordered data mode.
> audit(1197190525.100:2): audit_pid=1989 old=0 by auid=4294967295
> KERNEL: assertion (packets <= tp->packets_out) failed at net/ipv4/tcp_input.c (2136)
> KERNEL: assertion (packets <= tp->packets_out) failed at net/ipv4/tcp_input.c (2136)
> ------------[ cut here ]------------
> Badness at net/ipv4/tcp_input.c:2518
> NIP: c0000000003d46a4 LR: c0000000003d4d84 CTR: c000000000408914
> REGS: c000000177b770e0 TRAP: 0700   Not tainted  (2.6.24-rc4-mm1)
> MSR: 9000000000029032 <EE,ME,IR,DR>  CR: 24002488  XER: 00000000
> TASK = c000000178868540[8316] 'cc1' THREAD: c000000177b74000 CPU: 1
> NIP [c0000000003d46a4] .tcp_ack+0xd5c/0x1ce8
> LR [c0000000003d4d84] .tcp_ack+0x143c/0x1ce8
> Call Trace:
> [c000000177b77360] [c0000000003d4d84] .tcp_ack+0x143c/0x1ce8 (unreliable)
> [c000000177b77530] [c0000000003d81ac] .tcp_rcv_established+0x2fc/0x8d4
> [c000000177b775e0] [c0000000003e2818] .tcp_v4_do_rcv+0x1fc/0x580
> [c000000177b776d0] [c0000000003e37e0] .tcp_v4_rcv+0xc44/0xd28
> [c000000177b777e0] [c0000000003bd398] .ip_local_deliver+0xb4/0x2cc
> [c000000177b77870] [c0000000003bd87c] .ip_rcv+0x2cc/0x6f0
> [c000000177b77930] [c000000000396444] .netif_receive_skb+0x440/0x4bc
> [c000000177b779f0] [c00000000028255c] .tg3_poll+0x71c/0xb78
> [c000000177b77b30] [c000000000396888] .net_rx_action+0x1e4/0x26c
> [c000000177b77be0] [c000000000069584] .__do_softirq+0xd8/0x190
> [c000000177b77ca0] [c00000000000b95c] .do_softirq+0x94/0x9c
> [c000000177b77d30] [c0000000000696f0] .irq_exit+0x70/0x88
> [c000000177b77db0] [c00000000000b83c] .do_IRQ+0xa0/0x12c
> [c000000177b77e30] [c000000000004790] hardware_interrupt_entry+0x18/0x1c
> Instruction dump:
> 7d7a5b78 3b200000 409e0008 933b0584 811b0584 39200000 2fa80000 409e0018 
> 801b0588 2f800000 419e000c 39200001 <0fe00000> 2fa90000 409e0d60 72b40040 
> KERNEL: assertion (packets <= tp->packets_out) failed at net/ipv4/tcp_input.c (2136)
> ------------[ cut here ]------------
> 
> It's done that three times so far.

This as well is due to fack_count miscount. I found one corrupter already 
and will send a patch tomorrow (not sure if fixing that resolves also this 
issue).

-- 
 i.
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