Date:	Tue, 18 Nov 2008 07:50:07 +0100
From:	Willy Tarreau <w@....eu>
To:	Roger Heflin <rogerheflin@...il.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>
Subject: Re: WARNING: at net/sched/sch_generic.c:219 dev_watchdog+0xfe/0x17e() with tg3 network

Hello,

On Fri, Nov 14, 2008 at 10:01:46PM -0600, Roger Heflin wrote:
> Peter Zijlstra wrote:
> >(netdev CC'ed)
> >
> >On Tue, 2008-11-11 at 03:48 -0600, Roger Heflin wrote:
> >>I have duplicate this with kernel 2.6.27.2 and 2.6.27.5, no
> >>extra modules, tg3 Gbit networking.   I have not yet tested
> >>earlier kernels to see if this has been around for a while.
> >
> >How do more recent kernels do?
> 
> I did not try more recent kernels, more testing seems to indicate
> that at the very least it the bug depends on a certain version of
> either tg3 and/or firmware to happen, as my second tg3 port does not
> have it happen.    More about this below.

I got the exact same one yesterday and wanted to fire a bug report,
so yours is saving me some time :-)

It's on my notebook (HP nc8000, Pentium-M, no SMP, no HT). It was
connected to a 100 Mbps switch and was sending nearly 100 Mbps of
traffic. It had auto-negociated 100-full. I noticed long pauses
on the other side, finally realizing that my notebook was ill.
It's on 2.6.27.7-rc1. I have never had any such problem on this
notebook with any earlier kernel up to 2.6.25.X. I've never run
2.6.26 on it.

My tg3 is just PCI-based, no PCIe in this beast. I can send more
info when I turn it on. I don't think that the tg3 driver changes
often, so most likely digging through the changes between 2.6.25
and 2.6.27 should not take much time. I just don't know if I can
reliably reproduce the issue right now.

> >>So far I have had this error happen 5 times (MTBF is maybe
> >>12 hours), 4 of the 5 times resulted in the networking being
> >>broken, one time things came back by itself without a reboot,
> >>I believe in this case the hang was traffic coming into the
> >>machine vs the other times going out of the machine.
> >>
> >>Unloading all of the network modules and reloading them did
> >>not correct the problem.
> >>
> >>Searching google finds a couple of other people getting the
> >>same error but they have a different network chipset (e1000
> >>and a rt811C chipset), which makes me thing that there is
> >>something interacting bad with the network.    Or does this
> >>error truly mean that the network chipset for some unknown reason
> >>locked itself up?
> >>
> >>http://www.google.com/url?sa=U&start=4&q=http://kerneltrap.org/mailarchive/linux-netdev/2008/8/6/2838184&ei=rU8ZScysAon8edz5xKgO&sig2=Wxp7IkUtdgORGZiflxvppg&usg=AFQjCNHzPwsCOmLGKmtX4q_FEpk6oubxxg
> >>http://article.gmane.org/gmane.linux.network/110238
> >>
> >>The changes I made recently were to upgrade my MB (old
> >>was E100 on a 100Mbit network,new is tg3 on a Gbit network,
> >>cpu and memory are the same, MB chipset is a intel 955
> >>chipset vs the old being a intel 915 chipset).
> >>
> >>Autoneg is turned on all around, the GBit switch is a
> >>8-port Dlink switch.   The network seems to otherwise be working
> >>correctly.
> >>
> >>I did test the network under decent load and the error did not
> >>appear to be any more likely under load, and typically the network
> >>is under very light load 2-3MB/second.
> >>
> >>The machine originally had 2 HT CPU's showing up, I turned off HT
> >>so that only one cpu was showing, but this did not change the error.
> >>
> >>I am first turning off all offload capabilities on tg3 and going
> >>to see if that changes anything.
> 
> This made no difference in the error.
> 
> >>
> >>The next thing I am going to be doing is to turn of GB capability
> >>on the networking and see if that does anything.
> 
> Did not try.
> 
> >>
> >>I also have a second tg3 port that is slightly different, so I may
> >>try that eventually.
> 
> I tried this, and with the second port I don't appear to be getting
> the error.   The first port is a 5789-v3.29a and the second port is a
> 5788-v3.04, I know the first port is faster (pcie-x1) than the second
> port (pci bus-built-in, unknown exact connection).   The second port
> will sustain about 50MB/second, were as the first port will get
> >90MB/second.
> 
> It seems to me to likely be the firmware on the tg3, and it would seem
> unlikely that the driver could do anything more than work around the
> issue that is in the firmware, and currently my system works on the
> second port, and the second port is fast enough for my needs.
> 
> If someone else runs into this issue, since I have 2 ports I would be
> able to do some testing on it, right now my first port is locked up, and
> the machine is running fine on the second port.
> 
> lspci -vvv for the first (bad) port:
> 
> 02:00.0 Ethernet controller: Broadcom Corporation NetLink BCM5789 Gigabit 
> Ethernet PCI Express (rev 11)
>         Subsystem: Foxconn International, Inc. Unknown device 0cc1
>         Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- 
> Stepping- SERR- FastB2B-
>         Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- 
>         <TAbort- <MAbort- >SERR- <PERR-
>         Latency: 0, Cache Line Size: 32 bytes
>         Interrupt: pin A routed to IRQ 19
>         Region 0: Memory at fd8f0000 (64-bit, non-prefetchable) [size=64K]
>         Expansion ROM at <ignored> [disabled]
>         Capabilities: [48] Power Management version 2
>                 Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA 
> PME(D0-,D1-,D2-,D3hot+,D3cold+)
>                 Status: D3 PME-Enable- DSel=0 DScale=1 PME-
>         Capabilities: [50] Vital Product Data
>         Capabilities: [58] Message Signalled Interrupts: Mask- 64bit+ 
>         Queue=0/3 Enable-
>                 Address: 0101b8102a0f7b0c  Data: f21e
>         Capabilities: [d0] Express Endpoint IRQ 0
>                 Device: Supported: MaxPayload 128 bytes, PhantFunc 0, 
>                 ExtTag+
>                 Device: Latency L0s <4us, L1 unlimited
>                 Device: AtnBtn- AtnInd- PwrInd-
>                 Device: Errors: Correctable- Non-Fatal- Fatal- Unsupported-
>                 Device: RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop-
>                 Device: MaxPayload 128 bytes, MaxReadReq 4096 bytes
>                 Link: Supported Speed 2.5Gb/s, Width x1, ASPM L0s, Port 0
>                 Link: Latency L0s <2us, L1 <64us
>                 Link: ASPM Disabled RCB 64 bytes CommClk+ ExtSynch-
>                 Link: Speed 2.5Gb/s, Width x1
>         Capabilities: [100] Advanced Error Reporting
>         Capabilities: [13c] Virtual Channel
> 
> 
> >>
> >>Nov 11 00:44:39 computer kernel: ------------[ cut here ]------------
> >>Nov 11 00:44:39 computer kernel: WARNING: at net/sched/sch_generic.c:219 
> >>dev_watchdog+0xfe/0x17e()
> >>Nov 11 00:44:39 computer kernel: NETDEV WATCHDOG: eth0 (tg3): transmit 
> >>timed out
> >>Nov 11 00:44:39 computer kernel: Modules linked in: nfsd auth_rpcgss 
> >>exportfs w83627ehf hwmon_vid hwmon nfs lockd nfs_acl sunrpc ipv6 xfs 
> >>raid456 async_xor async_memcpy async_tx xor video output sbs sbshc 
> >>battery ac lgdt330x cx88_dvb wm8775 cx88_vp3054_i2c cx25840 tuner_simple 
> >>tuner_types tda9887 tda8290 tuner mt2131 s5h1409 snd_hda_intel 
> >>snd_seq_dummy ivtv cx8800 snd_seq_oss cx88_alsa cx8802 cx88xx cx23885 
> >>snd_seq_midi_event snd_seq ir_common videodev v4l1_compat i2c_algo_bit 
> >>cx2341x firewire_ohci iTCO_wdt snd_seq_device compat_ioctl32 videobuf_dvb 
> >>i2c_i801 firewire_core tveeprom floppy iTCO_vendor_support v4l2_common 
> >>snd_pcm_oss dvb_core pcspkr tg3 sata_sil i2c_core btcx_risc 
> >>videobuf_dma_sg crc_itu_t snd_mixer_oss libphy videobuf_core snd_pcm 
> >>parport_pc parport snd_timer snd soundcore button snd_page_alloc sg 
> >>dm_snapshot dm_zero dm_mirror dm_log dm_mod ahci ata_piix ata_generic 
> >>libata sd_mod scsi_mod ext3 jbd mbcache ehci_hcd ohci_hcd uhci_hcd [last 
> >>unloaded: eeprom]
> >>Nov 11 00:44:39 computer kernel: Pid: 0, comm: swapper Not tainted 
> >>2.6.27.5 #2
> >>Nov 11 00:44:39 computer kernel:  [<c042524f>] warn_slowpath+0x61/0x83
> >>Nov 11 00:44:39 computer kernel:  [<c05663a4>] 
> >>usb_hcd_submit_urb+0x75c/0x811
> >>Nov 11 00:44:39 computer kernel:  [<c0594972>] hiddev_hid_event+0x0/0x64
> >>Nov 11 00:44:39 computer kernel:  [<c058ce80>] hid_process_event+0x58/0x5f
> >>Nov 11 00:44:39 computer kernel:  [<c04e13d6>] __next_cpu+0x12/0x21
> >>Nov 11 00:44:39 computer kernel:  [<c041cbe3>] 
> >>find_busiest_group+0x23e/0x672
> >>Nov 11 00:44:39 computer kernel:  [<c0439d1e>] 
> >>clocksource_get_next+0x39/0x3f
> >>Nov 11 00:44:39 computer kernel:  [<c0438e51>] 
> >>update_wall_time+0x567/0x70c
> >>Nov 11 00:44:39 computer kernel:  [<c040783e>] read_tsc+0x6/0x22
> >>Nov 11 00:44:39 computer kernel:  [<c04387e8>] getnstimeofday+0x37/0xc1
> >>Nov 11 00:44:39 computer kernel:  [<f8829a83>] 
> >>uhci_scan_schedule+0x11b/0x6b0 [uhci_hcd]
> >>Nov 11 00:44:39 computer kernel:  [<c05b16ba>] dev_watchdog+0xfe/0x17e
> >>Nov 11 00:44:39 computer kernel:  [<c042c66f>] __mod_timer+0x99/0xa3
> >>Nov 11 00:44:39 computer kernel:  [<c05654b6>] rh_timer_func+0x0/0x5
> >>Nov 11 00:44:39 computer kernel:  [<c05654ae>] 
> >>usb_hcd_poll_rh_status+0x12b/0x133
> >>Nov 11 00:44:39 computer kernel:  [<c043bca8>] 
> >>tick_dev_program_event+0x1e/0x81
> >>Nov 11 00:44:39 computer kernel:  [<c05b15bc>] dev_watchdog+0x0/0x17e
> >>Nov 11 00:44:39 computer kernel:  [<c042c2b4>] 
> >>run_timer_softirq+0x10e/0x167
> >>Nov 11 00:44:39 computer kernel:  [<c05b15bc>] dev_watchdog+0x0/0x17e
> >>Nov 11 00:44:39 computer kernel:  [<c0428d3e>] __do_softirq+0x5d/0xc1
> >>Nov 11 00:44:39 computer kernel:  [<c0428dd4>] do_softirq+0x32/0x36
> >>Nov 11 00:44:39 computer kernel:  [<c0412939>] 
> >>smp_apic_timer_interrupt+0x6e/0x79
> >>Nov 11 00:44:39 computer kernel:  [<c040431c>] 
> >>apic_timer_interrupt+0x28/0x30
> >>Nov 11 00:44:39 computer kernel:  [<c0408582>] mwait_idle+0x32/0x38
> >>Nov 11 00:44:39 computer kernel:  [<c040255d>] cpu_idle+0xbd/0xd5

Willy

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