netdev - Re: 2.6.29-rc1-wl gives WARNING on ich8lan

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Date:	Thu, 15 Jan 2009 20:06:17 -0800
From:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Norbert Preining <preining@...ic.at>, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, David Graham <david.graham@...el.com>,
	Bruce Allan <bruce.w.allan@...el.com>
Subject: Re: 2.6.29-rc1-wl gives WARNING on ich8lan

On Wed, Jan 14, 2009 at 10:25 PM, Andrew Morton
<akpm@...ux-foundation.org> wrote:
> On Thu, 15 Jan 2009 00:15:46 +0100 Norbert Preining <preining@...ic.at> wrote:
>
>> Hi all,
>>
>> (please cc)
>
> (please cc right lists!)
>
>> 2.6.29-rc1-wl (wireless testing) gives me:
>>
>> [  367.804080] WARNING: at drivers/net/e1000e/ich8lan.c:412 e1000_acquire_swflag_ich8lan+0x35/0xcc()
>> [  367.804085] Hardware name: VGN-Z11VN_B
>> [  367.804088] e1000e mutex contention. Owned by pid 3781
>> [  367.804092] Modules linked in: binfmt_misc rfcomm l2cap kvm isofs zlib_inflate fuse dm_crypt dm_mod firewire_sbp2 loop arc4 iwlagn iwlcore rfkill joydev firewire_ohci mac80211 firewire_core crc_itu_t cfg80211 btusb sony_laptop tpm_infineon video backlight
>> [  367.804143] Pid: 8, comm: events/1 Not tainted 2.6.29-rc1-wl #1
>> [  367.804148] Call Trace:
>> [  367.804158]  [<ffffffff80236441>] warn_slowpath+0xd8/0x112
>> [  367.804169]  [<ffffffff8051152f>] _spin_unlock_irqrestore+0x31/0x3d
>> [  367.804178]  [<ffffffff802324f9>] try_to_wake_up+0x168/0x17a
>> [  367.804186]  [<ffffffff8023250b>] default_wake_function+0x0/0x9
>> [  367.804196]  [<ffffffff80323438>] delay_tsc+0x0/0xc8
>> [  367.804204]  [<ffffffff8022c48d>] dequeue_entity+0xf/0x102
>> [  367.804211]  [<ffffffff803a12a4>] e1000_acquire_swflag_ich8lan+0x35/0xcc
>> [  367.804219]  [<ffffffff803a5c0b>] e1000e_read_phy_reg_bm+0x39/0xbe
>> [  367.804227]  [<ffffffff803a5ee7>] e1000e_phy_has_link_generic+0x50/0xcc
>> [  367.804234]  [<ffffffff8022c48d>] dequeue_entity+0xf/0x102
>> [  367.804242]  [<ffffffff803ad593>] e1000_watchdog_task+0x0/0x6ef
>> [  367.804249]  [<ffffffff803a4d25>] e1000e_check_for_copper_link+0x24/0x86
>> [  367.804257]  [<ffffffff8023f05e>] lock_timer_base+0x26/0x4b
>> [  367.804265]  [<ffffffff803aa186>] e1000_has_link+0x40/0xc1
>> [  367.804272]  [<ffffffff803ad5ca>] e1000_watchdog_task+0x37/0x6ef
>> [  367.804280]  [<ffffffff803ad593>] e1000_watchdog_task+0x0/0x6ef
>> [  367.804289]  [<ffffffff80245058>] run_workqueue+0x87/0x122
>> [  367.804296]  [<ffffffff802451cb>] worker_thread+0xd8/0xe7
>> [  367.804304]  [<ffffffff802487a8>] autoremove_wake_function+0x0/0x2e
>> [  367.804311]  [<ffffffff802450f3>] worker_thread+0x0/0xe7
>> [  367.804318]  [<ffffffff802450f3>] worker_thread+0x0/0xe7
>> [  367.804324]  [<ffffffff8024848f>] kthread+0x47/0x73
>> [  367.804332]  [<ffffffff8020c6aa>] child_rip+0xa/0x20
>> [  367.804338]  [<ffffffff80248448>] kthread+0x0/0x73
>> [  367.804344]  [<ffffffff8020c6a0>] child_rip+0x0/0x20
>> [  367.804349] ---[ end trace 608ec83548aefe5d ]---
>>
>> Should I be concerned?
>>
>
> I don't think so.  It looks like it's just some developer debug code:
>
>        if (!mutex_trylock(&nvm_mutex)) {
>                WARN(1, KERN_ERR "e1000e mutex contention. Owned by process "
>                     "%s (pid %d), required by process %s (pid %d)\n",
>                     nvm_owner_name, nvm_owner_pid,
>                     current->comm, current->pid);
>
>                mutex_lock(&nvm_mutex);
>        }
>
> guys, is this actually indicative of a bug?  An unexpected state?
>
> If not, I'd suggest that this code simply be removed, or downgraded
> into a developer-only debug thing.  We don't want the kernel to be
> spewing scary things at people.
>
> --
>

A message from Dave Graham <david.graham@...el.com>...

The message identifies a condition that rarely occurs, and that I'd
like to monitor for a few more weeks. While this WARN occurred
fequently until recent 2.6.28 kernels, the messages have already
helped us to tighten our code to reduce contentious access to this
path, and so we now longer expect many. In fact at this time we only
have one (this one) report, out of a total 1,296 WARNs shown at
www.kerneloops.org for all 2.6.29-rc builds. There's been a minor
improvement to the WARN message tagged as tag v2.6.29-rc1-6-geefacf3,
and I'd like to collect & analyze a few reports that include that
change.

I'll monitor reports up at keneloops daily, and when I've got 5 or
more, I can quickly move the WARN to debug-only code, so reports will
soon stop. Does that sound OK?


-- 
Cheers,
Jeff
--
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