netdev - r8169 transmit queue time outs

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Date:	Thu, 6 May 2010 10:17:15 -0400
From:	Kyle McMartin <kmcmartin@...hat.com>
To:	Francois Romieu <romieu@...zoreil.com>
Cc:	netdev@...r.kernel.org
Subject: r8169 transmit queue time outs

Hi Francois,

Some of our users have been seeing their r8169 cards just up and stop
transmitting packets pretty quickly after boot with recent kernels.

After trying a few things:
 1- Updating the driver to the latest upstream (and -next).
 2- Downgrading the driver to the last known working release version.

Nothing seems to have helped.

I take it from the fact that the last known working driver no longer
works on a newer kernel to mean that something has changed in the core
net code that makes the r8169 driver particularly unhappy?

The WARN_ON getting triggered is:
------------[ cut here ]------------
WARNING: at net/sched/sch_generic.c:246 dev_watchdog+0xc6/0x12d() (Not
tainted)
Hardware name: VX800
NETDEV WATCHDOG: eth0 (r8169): transmit queue 0 timed out
Modules linked in: sunrpc ip6_tables cpufreq_ondemand acpi_cpufreq
dm_multipath
uinput snd_hda_codec_via snd_hda_intel snd_hda_codec snd_hwdep snd_seq
snd_seq_device snd_pcm snd_timer i2c_viapro snd soundcore snd_page_alloc
r8169
serio_raw i2c_core mii pata_acpi ata_generic pata_via [last unloaded:
scsi_wait_scan]
Pid: 0, comm: swapper Not tainted 2.6.31.5-127.fc12.i686.PAE #1
Call Trace:
 [<c043db03>] warn_slowpath_common+0x70/0x87
 [<c06ff9d0>] ? dev_watchdog+0xc6/0x12d
 [<c043db58>] warn_slowpath_fmt+0x29/0x2c
 [<c06ff9d0>] dev_watchdog+0xc6/0x12d
 [<c04471bd>] ? mod_timer+0x20/0x27
 [<c0680021>] ? usb_hcd_poll_rh_status+0x126/0x12e
 [<c06ff90a>] ? dev_watchdog+0x0/0x12d
 [<c0446e91>] run_timer_softirq+0x14e/0x1af
 [<c0442daa>] __do_softirq+0xb1/0x157
 [<c0442e86>] do_softirq+0x36/0x41
 [<c0442f78>] irq_exit+0x2e/0x61
 [<c041cf17>] smp_apic_timer_interrupt+0x6d/0x7b
 [<c04099b5>] apic_timer_interrupt+0x31/0x38
 [<c040f34b>] ? mwait_idle+0x67/0x85
 [<c040811f>] cpu_idle+0x96/0xaf
 [<c0765784>] rest_init+0x58/0x5a
 [<c09a78c3>] start_kernel+0x32b/0x330
 [<c09a7081>] i386_start_kernel+0x70/0x77
---[ end trace 8eb83276b856939b ]---  

And the RH bugzilla ref is:
https://bugzilla.redhat.com/show_bug.cgi?id=538920

I'd be happy to do whatever is necessary to help figure this out.

regards, Kyle
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