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Message-ID: <48936CAA.8080504@gmail.com>
Date: Fri, 01 Aug 2008 22:06:02 +0200
From: Jarek Poplawski <jarkao2@...il.com>
To: Dave Jones <davej@...emonkey.org.uk>
CC: netdev@...r.kernel.org
Subject: Re: _xmit_ETHER lockdep warning. (-git8)
Dave Jones wrote, On 08/01/2008 09:29 PM:
> A week or so old, but possibly still valid..
Just fixed in net-2.6:
commit c3f26a269c2421f97f10cf8ed05d5099b573af4d
Author: David S. Miller <davem@...emloft.net>
Date: Thu Jul 31 16:58:50 2008 -0700
netdev: Fix lockdep warnings in multiqueue configurations.
Jarek P.
>
> https://bugzilla.redhat.com/show_bug.cgi?id=456521
>
>
> =============================================
> [ INFO: possible recursive locking detected ]
> 2.6.27-0.166.rc0.git8.fc10.x86_64 #1
> ---------------------------------------------
> swapper/0 is trying to acquire lock:
> (_xmit_ETHER){-+..}, at: [<ffffffff812828a3>] dev_watchdog+0x41/0x1a7
>
> but task is already holding lock:
> (_xmit_ETHER){-+..}, at: [<ffffffff812828a3>] dev_watchdog+0x41/0x1a7
>
> other info that might help us debug this:
> 1 lock held by swapper/0:
> #0: (_xmit_ETHER){-+..}, at: [<ffffffff812828a3>] dev_watchdog+0x41/0x1a7
>
> stack backtrace:
> Pid: 0, comm: swapper Not tainted 2.6.27-0.166.rc0.git8.fc10.x86_64 #1
>
> Call Trace:
> <IRQ> [<ffffffff81061b46>] __lock_acquire+0x790/0xaa7
> [<ffffffff81060d80>] ? trace_hardirqs_on+0xd/0xf
> [<ffffffff812828a3>] ? dev_watchdog+0x41/0x1a7
> [<ffffffff81061ef3>] lock_acquire+0x96/0xc3
> [<ffffffff812828a3>] ? dev_watchdog+0x41/0x1a7
> [<ffffffff812f5eb8>] _spin_lock+0x2b/0x58
> [<ffffffff812828a3>] dev_watchdog+0x41/0x1a7
> [<ffffffff81282862>] ? dev_watchdog+0x0/0x1a7
> [<ffffffff81048ba6>] run_timer_softirq+0x17f/0x1f7
> [<ffffffff810450eb>] __do_softirq+0x83/0x110
> [<ffffffff8100dcbc>] call_softirq+0x1c/0x28
> [<ffffffff8100ef81>] do_softirq+0x52/0xb5
> [<ffffffff81044c95>] irq_exit+0x53/0xa0
> [<ffffffff8101d160>] smp_apic_timer_interrupt+0x94/0xad
> [<ffffffff8100d4c8>] apic_timer_interrupt+0x88/0x90
> <EOI> [<ffffffff81022880>] ? native_safe_halt+0x6/0x8
> [<ffffffff81060d80>] ? trace_hardirqs_on+0xd/0xf
> [<ffffffff81013537>] ? default_idle+0x2f/0x51
> [<ffffffff81013661>] ? c1e_idle+0x108/0x10f
> [<ffffffff812f9204>] ? atomic_notifier_call_chain+0x14/0x16
> [<ffffffff8100b2d6>] ? cpu_idle+0x92/0xeb
> [<ffffffff812efbef>] ? start_secondary+0x1a1/0x1a3
>
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