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Date:	Sun, 17 Feb 2008 14:12:29 +0000
From:	Kristof Provost <Kristof@...vost-engineering.be>
To:	netdev@...r.kernel.org
Subject: [BUG] IPv6 recursive locking

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Hash: SHA1

Hi,

I'm running the current git (1309d4e68497184d2fd87e892ddf14076c2bda98) 
without problems. While I was toying with IPv6 on my local network I managed 
to completely hang my machine whenever it receives or sends a neighbour
sollictation. At least, I think that's the cause. It started as soon as I 
installed radvd on the router. The included trace seems to point in the same
direction.

The machine is a Dell Latitude D505 (so x86). Network interfaces are e100 and
ipw2200 (firmware not loaded). I'm currently using the e100.

I'll try to bisect it but here's the trace already. Let me know if
there's anything else you'd like to know.

[  124.439831] =============================================
[  124.443689] [ INFO: possible recursive locking detected ]
[  124.443689] 2.6.25-rc2 #33
[  124.443689] ---------------------------------------------
[  124.443689] swapper/0 is trying to acquire lock:
[  124.443689]  (&n->lock){-+-+}, at: [<c0468d39>] neigh_resolve_output+0x139/0x290
[  124.443689]
[  124.443689] but task is already holding lock:
[  124.443689]  (&n->lock){-+-+}, at: [<c0468ea4>] neigh_timer_handler+0x14/0x280
[  124.443689]
[  124.443689] other info that might help us debug this:
[  124.443689] 1 lock held by swapper/0:
[  124.443689]  #0:  (&n->lock){-+-+}, at: [<c0468ea4>] neigh_timer_handler+0x14/0x280
[  124.443689]
[  124.443689] stack backtrace:
[  124.443689] Pid: 0, comm: swapper Not tainted 2.6.25-rc2 #33
[  124.443689]  [<c014863a>] __lock_acquire+0xd3a/0xf40
[  124.443689]  [<c0137ec8>] __kernel_text_address+0x18/0x30
[  124.443689]  [<c01488a0>] lock_acquire+0x60/0x80
[  124.443689]  [<c0468d39>] neigh_resolve_output+0x139/0x290
[  124.443689]  [<c059287e>] _write_lock_bh+0x2e/0x40
[  124.443689]  [<c0468d39>] neigh_resolve_output+0x139/0x290
[  124.443689]  [<c0468d39>] neigh_resolve_output+0x139/0x290
[  124.443689]  [<c0148805>] __lock_acquire+0xf05/0xf40
[  124.443689]  [<c04e1650>] ndisc_dst_alloc+0xe0/0x170
[  124.443689]  [<c04d39f4>] ip6_output_finish+0xa4/0x110
[  124.443689]  [<c0147a1d>] __lock_acquire+0x11d/0xf40
[  124.443689]  [<c04d4759>] ip6_output+0x5b9/0xba0
[  124.443689]  [<c0456eb6>] sock_alloc_send_skb+0x176/0x1d0
[  124.443689]  [<c04e4eab>] __ndisc_send+0x33b/0x540
[  124.443690]  [<c04e4d6e>] __ndisc_send+0x1fe/0x540
[  124.443690]  [<c04e5b69>] ndisc_send_ns+0x69/0xa0
[  124.443690]  [<c04e6c8e>] ndisc_solicit+0xee/0x1b0
[  124.443690]  [<c01472b5>] mark_held_locks+0x35/0x80
[  124.443690]  [<c0592c65>] _spin_unlock_irqrestore+0x45/0x60
[  124.443690]  [<c01473f9>] trace_hardirqs_on+0x79/0x130
[  124.443690]  [<c012f99f>] __mod_timer+0x9f/0xb0
[  124.443690]  [<c0468fd3>] neigh_timer_handler+0x143/0x280
[  124.443690]  [<c012f2ca>] run_timer_softirq+0x14a/0x1c0
[  124.443690]  [<c0468e90>] neigh_timer_handler+0x0/0x280
[  124.443690]  [<c0468e90>] neigh_timer_handler+0x0/0x280
[  124.443690]  [<c012b4c4>] __do_softirq+0x84/0x100
[  124.443690]  [<c012b595>] do_softirq+0x55/0x60
[  124.443690]  [<c012b9e5>] irq_exit+0x65/0x80
[  124.443690]  [<c01073b0>] do_IRQ+0x40/0x70
[  124.443690]  [<c010585e>] common_interrupt+0x2e/0x34
[  124.443690]  [<c032007b>] acpi_power_on+0x3b/0x104
[  124.443690]  [<c0322af6>] acpi_idle_enter_simple+0x194/0x1fe
[  124.443690]  [<c0322727>] acpi_idle_enter_bm+0xc1/0x2fc
[  124.443690]  [<c03fff43>] cpuidle_idle_call+0x63/0xb0
[  124.443690]  [<c03ffee0>] cpuidle_idle_call+0x0/0xb0
[  124.443690]  [<c010380d>] cpu_idle+0x5d/0xf0
[  124.443690]  =======================

Kristof

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