linux-kernel - Re: WARNING: at net/ipv4/tcp_input.c:2054 tcp_mark_head

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Date:	Wed, 27 Feb 2008 19:56:44 +0100
From:	"Guillaume Chazarain" <guichaz@...il.com>
To:	"Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi>
Cc:	"Giangiacomo Mariotti" <giangiacomo_mariotti@...oo.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Netdev <netdev@...r.kernel.org>,
	"Andrew Morton" <akpm@...ux-foundation.org>
Subject: Re: WARNING: at net/ipv4/tcp_input.c:2054 tcp_mark_head_lost()

Hi Ilpo,

On Wed, Feb 27, 2008 at 10:29 AM, Ilpo Järvinen
<ilpo.jarvinen@...sinki.fi> wrote:
> I did in the past a debug patch
>  that verifies TCP's write queue state by the hard way, ie., by bruteforce
>  walking often enough to catch inconsistencies early enough to find out
>  the root cause.

Are you talking about this one:
http://marc.info/?l=linux-netdev&m=119482084511178 ?
I attached a forward port to current git.

I am using this patch, and caught this maybe related error while Bittorrenting:

KERNEL: assertion (packets <= tp->packets_out) failed at
/home/g/linux-2.6/net/ipv4/tcp_input.c (2145)
KERNEL: assertion (packets <= tp->packets_out) failed at
/home/g/linux-2.6/net/ipv4/tcp_input.c (2145)
------------[ cut here ]------------
WARNING: at /home/g/linux-2.6/net/ipv4/tcp_input.c:2515
tcp_fastretrans_alert+0xa5/0xa4f()
Modules linked in: radeon drm acpi_cpufreq lm90 hwmon binfmt_misc
dm_mirror dm_mod snd_intel8x0m snd_intel8x0 snd_seq_dummy
snd_ac97_codec ac97_bus snd_seq_oss snd_seq_midi_event snd_seq
snd_seq_device snd_pcm_oss snd_mixer_oss snd_pcm snd_timer snd
ohci1394 ieee1394 hci_usb ipw2200 bluetooth usbhid ieee80211
firewire_ohci soundcore hid snd_page_alloc sg rtc_cmos i2c_i801
iTCO_wdt serio_raw firewire_core button ac asus_laptop i2c_core
rtc_core crc_itu_t irda crc_ccitt battery skge led_class rtc_lib
pcspkr ieee80211_crypt sdhci mmc_core sr_mod cdrom pata_acpi uhci_hcd
ohci_hcd ehci_hcd
Pid: 0, comm: swapper Not tainted 2.6.25-rc2-gc-00243-g54a8145 #379
 [<c011aff0>] warn_on_slowpath+0x41/0x51
 [<c02e0ae0>] ? tcp_sacktag_walk+0x67/0x2a6
 [<c02e9c9f>] ? tcp_v4_send_check+0x77/0xb1
 [<c02e5aa2>] ? tcp_transmit_skb+0x644/0x677
 [<c0169634>] ? __slab_free+0x56/0x262
 [<c02b5738>] ? skb_release_data+0x84/0x89
 [<c016a004>] ? kfree+0x6e/0x7a
 [<c02b5738>] ? skb_release_data+0x84/0x89
 [<c02e0046>] tcp_fastretrans_alert+0xa5/0xa4f
 [<c02e2089>] tcp_ack+0xba6/0xcf9
 [<c02e4740>] tcp_rcv_established+0xdb/0x5fb
 [<c02e960e>] tcp_v4_do_rcv+0x28/0x188
 [<c02ead20>] tcp_v4_rcv+0x5a2/0x607
 [<f8985daf>] ? ipw_rx+0x12b5/0x12bd [ipw2200]
 [<c02d4165>] ip_local_deliver_finish+0xda/0x16a
 [<c02d4543>] ip_local_deliver+0x64/0x6d
 [<c02d406c>] ip_rcv_finish+0x244/0x263
 [<c02d44c1>] ip_rcv+0x1d2/0x1f0
 [<c02b9e86>] netif_receive_skb+0x34d/0x3d1
 [<c02bbc2f>] process_backlog+0x5b/0xa5
 [<c02bb849>] net_rx_action+0x86/0x166
 [<c011f418>] __do_softirq+0x38/0x7a
 [<c0106327>] do_softirq+0x3e/0x72
 [<c014a0e3>] ? handle_fasteoi_irq+0x0/0xbd
 [<c011f364>] irq_exit+0x28/0x61
 [<c01063f0>] do_IRQ+0x95/0xaa
 [<c0105293>] common_interrupt+0x23/0x28
 [<c014007b>] ? cgroup_scan_tasks+0x73/0x15b
 [<c0110000>] ? io_apic_set_pci_routing+0x2b/0x119
 [<c023a59c>] ? acpi_idle_enter_simple+0x15b/0x1c7
 [<c023a6bb>] acpi_idle_enter_bm+0xb3/0x2cc
 [<c02acc2b>] cpuidle_idle_call+0x4c/0x71
 [<c02acbdf>] ? cpuidle_idle_call+0x0/0x71
 [<c0103570>] cpu_idle+0x5a/0x87
 [<c0311af8>] rest_init+0x5c/0x5e
 =======================
---[ end trace c3302487bda6288d ]---


I attached the full dmesg, but I don't think there is any output
caused by the TCP_DEBUG patch.


Cheers.

-- 
Guillaume

Download attachment "TCP_DEBUG" of type "application/octet-stream" (6958 bytes)

Download attachment "dmesg-tcp" of type "application/octet-stream" (52493 bytes)