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SubjectRe: [PATCH] RCU: don't turn off lockdep when find suspicious rcu_dereference_check() usage
Hi,

a plain -rc5 triggers at net/core/dev.c:1993 here too:

[ 12.889090] ===================================================
[ 12.889387] [ INFO: suspicious rcu_dereference_check() usage. ]
[ 12.889533] ---------------------------------------------------
[ 12.889679] net/core/dev.c:1993 invoked rcu_dereference_check() without protection!
[ 12.889929]
[ 12.889929] other info that might help us debug this:
[ 12.889930]
[ 12.890368]
[ 12.890369] rcu_scheduler_active = 1, debug_locks = 0
[ 12.890659] 2 locks held by swapper/0:
[ 12.890803] #0: (&idev->mc_ifc_timer){+.-...}, at: [<ffffffff81045f4a>] run_timer_softirq+0x266/0x503
[ 12.891227] #1: (rcu_read_lock_bh){.+....}, at: [<ffffffff81397eb4>] dev_queue_xmit+0x153/0x512
[ 12.891647]
[ 12.891648] stack backtrace:
[ 12.891934] Pid: 0, comm: swapper Not tainted 2.6.34-rc5 #1
[ 12.892085] Call Trace:
[ 12.892231] <IRQ> [<ffffffff81065d8f>] lockdep_rcu_dereference+0xaa/0xb2
[ 12.892430] [<ffffffff81397fbf>] dev_queue_xmit+0x25e/0x512
[ 12.892576] [<ffffffff81397eb4>] ? dev_queue_xmit+0x153/0x512
[ 12.892723] [<ffffffff81066a4a>] ? trace_hardirqs_on+0xd/0xf
[ 12.892871] [<ffffffff8103f4fb>] ? local_bh_enable_ip+0xbc/0xda
[ 12.893024] [<ffffffff8139ea67>] neigh_resolve_output+0x323/0x36a
[ 12.893183] [<ffffffffa00ae6b7>] ? ipv6_chk_mcast_addr+0x0/0x1fa [ipv6]
[ 12.893338] [<ffffffffa0094860>] ip6_output_finish+0x81/0xb9 [ipv6]
[ 12.893492] [<ffffffffa0096067>] ip6_output2+0x2a9/0x2b4 [ipv6]
[ 12.893644] [<ffffffffa0096c33>] ip6_output+0xbc1/0xbd0 [ipv6]
[ 12.893797] [<ffffffffa00a2a06>] ? fib6_force_start_gc+0x30/0x32 [ipv6]
[ 12.893951] [<ffffffffa00b04e8>] mld_sendpack+0x30b/0x435 [ipv6]
[ 12.894109] [<ffffffffa00b01dd>] ? mld_sendpack+0x0/0x435 [ipv6]
[ 12.894264] [<ffffffff8106676d>] ? mark_held_locks+0x52/0x70
[ 12.894418] [<ffffffffa00b0d2d>] mld_ifc_timer_expire+0x254/0x28d [ipv6]
[ 12.894570] [<ffffffff81046065>] run_timer_softirq+0x381/0x503
[ 12.894717] [<ffffffff81045f4a>] ? run_timer_softirq+0x266/0x503
[ 12.894870] [<ffffffffa00b0ad9>] ? mld_ifc_timer_expire+0x0/0x28d [ipv6]
[ 12.895024] [<ffffffff8103f708>] ? __do_softirq+0x79/0x2f5
[ 12.895174] [<ffffffff8103f80f>] __do_softirq+0x180/0x2f5
[ 12.895323] [<ffffffff810030cc>] call_softirq+0x1c/0x28
[ 12.895472] [<ffffffff81004d91>] do_softirq+0x3d/0x85
[ 12.895619] [<ffffffff8103f2b5>] irq_exit+0x4a/0x95
[ 12.895766] [<ffffffff81413a3d>] smp_apic_timer_interrupt+0x8c/0x9a
[ 12.895913] [<ffffffff81002b93>] apic_timer_interrupt+0x13/0x20
[ 12.896065] <EOI> [<ffffffff81412e1e>] ? _raw_spin_unlock_irqrestore+0x38/0x69
[ 12.896363] [<ffffffff8100a189>] ? default_idle+0xd8/0x10a
[ 12.896512] [<ffffffff8100a187>] ? default_idle+0xd6/0x10a
[ 12.896658] [<ffffffff8100a5b3>] c1e_idle+0xcd/0xf4
[ 12.896805] [<ffffffff8100138c>] cpu_idle+0x5e/0xb5
[ 12.896952] [<ffffffff813ff0eb>] rest_init+0xff/0x106
[ 12.897104] [<ffffffff813fefec>] ? rest_init+0x0/0x106
[ 12.897260] [<ffffffff818e7c2a>] start_kernel+0x30f/0x31a
[ 12.897409] [<ffffffff818e726d>] x86_64_start_reservations+0x7d/0x81
[ 12.897560] [<ffffffff818e7355>] x86_64_start_kernel+0xe4/0xeb

--
Regards/Gruss,
Boris.


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