netdev - BCM5721 transmit queue 0 timed out

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Date:	Thu, 18 Jul 2013 11:47:25 +0300
From:	Cosmin GIRADU <cosmin.giradu@...-rds.ro>
To:	Linux Net Dev <netdev@...r.kernel.org>
Subject: BCM5721 transmit queue 0 timed out

Hi,

I need some help with the following situation:

We keep getting random lockups on our BCM5721 cards (most of them are
LOMs, multiple machines, running multiple kernel versions between 3.4
and 3.10.1), when the traffic is high (above 300Mbit/s). The hardware is
dual port "Tigon3 [partno(BCM95721) rev 4201] (PCI Express)" with 5750
chip inside.
The lockups look like this:

------------[ cut here ]------------
WARNING: at net/sched/sch_generic.c:255 dev_watchdog+0x25a/0x270()
NETDEV WATCHDOG: eth2 (tg3): transmit queue 0 timed out
Modules linked in: ip_gre ip_tunnel gre loop processor thermal_sys
i2c_i801 lpc_ich coretemp button mfd_core
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 3.10.1.htb.104 #1
Hardware name: IBM IBM System x3250 -[43654BG]-/M31ip, BIOS IBM BIOS
Version 1.33-[G9E133AUS-1.33]- 08/28/2007
 ffffffff81781f16 ffff88003fd03d98 ffffffff8152f6eb ffff88003fd03dd8
 ffffffff8103659b ffff88003fd03dd8 ffff88003d3f0000 ffff88003e103d00
 0000000000000005 0000000000000001 ffff88003e0a9428 ffff88003fd03e38
Call Trace:
 <IRQ>  [<ffffffff8152f6eb>] dump_stack+0x19/0x1e
 [<ffffffff8103659b>] warn_slowpath_common+0x6b/0xa0
 [<ffffffff81036671>] warn_slowpath_fmt+0x41/0x50
 [<ffffffff81471d6a>] dev_watchdog+0x25a/0x270
 [<ffffffff81471b10>] ? __netdev_watchdog_up+0x80/0x80
 [<ffffffff8104312c>] call_timer_fn+0x2c/0x90
 [<ffffffff81043369>] run_timer_softirq+0x1d9/0x1f0
 [<ffffffff8103d351>] __do_softirq+0xd1/0x1a0
 [<ffffffff8103d4c5>] irq_exit+0x65/0x80
 [<ffffffff81024399>] smp_apic_timer_interrupt+0x69/0xa0
 [<ffffffff81533b0a>] apic_timer_interrupt+0x6a/0x70
 <EOI>  [<ffffffff8100a126>] ? default_idle+0x6/0x10
 [<ffffffff8100a2f6>] arch_cpu_idle+0x16/0x20
 [<ffffffff8106afd5>] cpu_startup_entry+0xa5/0x200
 [<ffffffff818c57ce>] start_secondary+0x267/0x269
---[ end trace d3a202af040f84f0 ]---
tg3 0000:01:00.0: tg3_stop_block timed out, ofs=1400 enable_bit=2
tg3 0000:01:00.0: tg3_stop_block timed out, ofs=c00 enable_bit=2
tg3 0000:01:00.0: tg3_stop_block timed out, ofs=1400 enable_bit=2
tg3 0000:01:00.0: tg3_stop_block timed out, ofs=c00 enable_bit=2

As far as I can tell the "tg3_stop_block timed out" is thrown when the
card is being reset after the hang timer expires and is quite harmless
(hope I'm reading it right). However said hangs do tend to be more
frequent as the amount of traffic rises, and that does interfere with
operation.

As a workaround, disabling scatter-gather on the offending cards stops
the problem from reappearing, however I'd like to get to the bottom of
this once and for all.

-- 

Cosmin GIRADU
OSS Engineer
RCS & RDS - Unified Services
Phone:  +40-31-400-6323
Mobile: +40-77-020-0858
http://www.rcs-rds.ro

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