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Date:	Sun, 17 Feb 2008 19:30:03 +0100
From:	Daniel Lezcano <dlezcano@...ibm.com>
To:	Kristof Provost <Kristof@...vost-engineering.be>
CC:	netdev@...r.kernel.org
Subject: Re: [BUG] IPv6 recursive locking

Kristof Provost wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> 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.

I think this bug was introduced by the commit:

69cc64d8d92bf852f933e90c888dfff083bd4fc9
"[NDISC]: Fix race in generic address resolution".


> [  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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