2.6.18rc2-gitSomething on my firewall box just triggered this..
Dave
[515613.791771] =======================================================
[515613.841467] [ INFO: possible circular locking dependency detected ]
[515613.873284] -------------------------------------------------------
[515613.904945] swapper/0 is trying to acquire lock:
[515613.931489] (&tbl->lock){-+-+}, at: [<c05b5d63>] neigh_lookup+0x50/0xaf
[515613.964369]
[515613.964373] but task is already holding lock:
[515614.006550] (&skb_queue_lock_key){-+..}, at: [<c05b741c>]
neigh_proxy_process+0x20/0xc2
[515614.043225]
[515614.043228] which lock already depends on the new lock.
[515614.043234]
[515614.103456]
[515614.103459] the existing dependency chain (in reverse order) is:
[515614.148752]
[515614.148755] -> #2 (&skb_queue_lock_key){-+..}:
[515614.188880] [<c043bf43>] lock_acquire+0x4b/0x6c
[515614.215554] [<c06089a7>] _spin_lock_irqsave+0x22/0x32
[515614.243606] [<c05ac2e3>] skb_dequeue+0x12/0x43
[515614.269657] [<c05acffe>] skb_queue_purge+0x14/0x1b
[515614.296565] [<c05b673e>] neigh_update+0x317/0x353
[515614.323004] [<c05e8a0b>] arp_process+0x4aa/0x4e4
[515614.349004] [<c05e8b19>] arp_rcv+0xd4/0xf1
[515614.373209] [<c05b1210>] netif_receive_skb+0x204/0x271
[515614.400405] [<c05b2b73>] process_backlog+0x99/0xfa
[515614.426351] [<c05b2d56>] net_rx_action+0x9d/0x196
[515614.451856] [<c04293d5>] __do_softirq+0x78/0xf2
[515614.476660] [<c040662f>] do_softirq+0x5a/0xbe
[515614.500737]
[515614.500741] -> #1 (&n->lock){-+-+}:
[515614.532763] [<c043bf43>] lock_acquire+0x4b/0x6c
[515614.556814] [<c06086d0>] _write_lock+0x19/0x28
[515614.580398] [<c05b7a0e>] neigh_periodic_timer+0x98/0x13c
[515614.606447] [<c042db48>] run_timer_softirq+0x108/0x167
[515614.631798] [<c04293d5>] __do_softirq+0x78/0xf2
[515614.655122] [<c040662f>] do_softirq+0x5a/0xbe
[515614.677721]
[515614.677724] -> #0 (&tbl->lock){-+-+}:
[515614.707327] [<c043bf43>] lock_acquire+0x4b/0x6c
[515614.729897] [<c060878a>] _read_lock_bh+0x1e/0x2d
[515614.752546] [<c05b5d63>] neigh_lookup+0x50/0xaf
[515614.774754] [<c05b6e5e>] neigh_event_ns+0x2c/0x77
[515614.797271] [<c05e88c7>] arp_process+0x366/0x4e4
[515614.819349] [<c05e8b3e>] parp_redo+0x8/0xa
[515614.839660] [<c05b7462>] neigh_proxy_process+0x66/0xc2
[515614.862931] [<c042db48>] run_timer_softirq+0x108/0x167
[515614.886048] [<c04293d5>] __do_softirq+0x78/0xf2
[515614.907136] [<c040662f>] do_softirq+0x5a/0xbe
[515614.927553]
[515614.927557] other info that might help us debug this:
[515614.927563]
[515614.966774] 1 lock held by swapper/0:
[515614.982693] #0: (&skb_queue_lock_key){-+..}, at: [<c05b741c>]
neigh_proxy_process+0x20/0xc2
[515615.013575]
[515615.013578] stack backtrace:
[515615.037414] [<c04051ea>] show_trace_log_lvl+0x54/0xfd
[515615.057910] [<c04057a6>] show_trace+0xd/0x10
[515615.075934] [<c04058bf>] dump_stack+0x19/0x1b
[515615.094167] [<c043b030>] print_circular_bug_tail+0x59/0x64
[515615.116172] [<c043b843>] __lock_acquire+0x808/0x997
[515615.136514] [<c043bf43>] lock_acquire+0x4b/0x6c
[515615.155699] [<c060878a>] _read_lock_bh+0x1e/0x2d
[515615.175098] [<c05b5d63>] neigh_lookup+0x50/0xaf
[515615.197276] [<c05b6e5e>] neigh_event_ns+0x2c/0x77
[515615.220267] [<c05e88c7>] arp_process+0x366/0x4e4
[515615.243248] [<c05e8b3e>] parp_redo+0x8/0xa
[515615.264645] [<c05b7462>] neigh_proxy_process+0x66/0xc2
[515615.288899] [<c042db48>] run_timer_softirq+0x108/0x167
[515615.309972] [<c04293d5>] __do_softirq+0x78/0xf2
[515615.328940] [<c040662f>] do_softirq+0x5a/0xbe
[515615.347150] [<c042927e>] irq_exit+0x3d/0x3f
[515615.365067] [<c0417cbb>] smp_apic_timer_interrupt+0x79/0x7e
[515615.387057] [<c0404b0a>] apic_timer_interrupt+0x2a/0x30
--
http://www.codemonkey.org.uk
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