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Subject2.6.34-rc1: rcu lockdep bug?
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Hello, Paul and Peter,

Attached is the lockdep warning that I triggered today.

I am not sure if this is a bug of rcu lockdep, because I am
testing my patch when this occurred. However, in the backtrace,
there is none of the functions that I touched, weird.

So, please help to check if this is a bug of rcu lockdep.

Please Cc netdev when necessary.

Thanks much!
Mar 11 17:11:22 dhcp-66-70-5 kernel: =================================
Mar 11 17:11:22 dhcp-66-70-5 kernel: [ INFO: inconsistent lock state ]
Mar 11 17:11:22 dhcp-66-70-5 kernel: 2.6.34-rc1 #58
Mar 11 17:11:22 dhcp-66-70-5 kernel: ---------------------------------
Mar 11 17:11:22 dhcp-66-70-5 kernel: inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage.
Mar 11 17:11:22 dhcp-66-70-5 kernel: swapper/0 [HC0[0]:SC1[1]:HE0:SE0] takes:
Mar 11 17:11:22 dhcp-66-70-5 kernel: (usbfs_mutex){+.?...}, at: [<ffffffff8146419f>] netif_receive_skb+0xe7/0x819
Mar 11 17:11:22 dhcp-66-70-5 kernel: {SOFTIRQ-ON-W} state was registered at:
Mar 11 17:11:22 dhcp-66-70-5 kernel: [<ffffffff810a6dc2>] __lock_acquire+0xaec/0xe55
Mar 11 17:11:22 dhcp-66-70-5 kernel: [<ffffffff810a9585>] lock_acquire+0x163/0x1aa
Mar 11 17:11:22 dhcp-66-70-5 kernel: [<ffffffff8154f5f9>] mutex_lock_nested+0x64/0x4e9
Mar 11 17:11:22 dhcp-66-70-5 kernel: [<ffffffff813e5ec5>] usbdev_open+0x115/0x4e9
Mar 11 17:11:22 dhcp-66-70-5 kernel: [<ffffffff8117af83>] chrdev_open+0x27a/0x2fe
Mar 11 17:11:22 dhcp-66-70-5 kernel: [<ffffffff81172f98>] __dentry_open+0x2d4/0x4d2
Mar 11 17:11:22 dhcp-66-70-5 kernel: [<ffffffff81174560>] nameidata_to_filp+0x58/0x7e
Mar 11 17:11:22 dhcp-66-70-5 kernel: [<ffffffff811858e9>] do_last+0x81b/0xa3d
Mar 11 17:11:22 dhcp-66-70-5 kernel: [<ffffffff81187220>] do_filp_open+0x2ff/0x869
Mar 11 17:11:22 dhcp-66-70-5 kernel: [<ffffffff81172b53>] do_sys_open+0x8c/0x187
Mar 11 17:11:22 dhcp-66-70-5 kernel: [<ffffffff81172c96>] sys_open+0x27/0x30
Mar 11 17:11:22 dhcp-66-70-5 kernel: [<ffffffff81003a5b>] system_call_fastpath+0x16/0x1b
Mar 11 17:11:22 dhcp-66-70-5 kernel: irq event stamp: 7135619
Mar 11 17:11:22 dhcp-66-70-5 kernel: hardirqs last enabled at (7135618): [<ffffffff8116c69f>] __kmalloc_node_track_caller+0x18d/0x256
Mar 11 17:11:22 dhcp-66-70-5 kernel: hardirqs last disabled at (7135619): [<ffffffff8155220a>] _raw_spin_lock_irqsave+0x3f/0xe2
Mar 11 17:11:22 dhcp-66-70-5 kernel: softirqs last enabled at (7135604): [<ffffffff8106a9a8>] __do_softirq+0x334/0x35f
Mar 11 17:11:22 dhcp-66-70-5 kernel: softirqs last disabled at (7135611): [<ffffffff8100498c>] call_softirq+0x1c/0x4c
Mar 11 17:11:22 dhcp-66-70-5 kernel:
Mar 11 17:11:22 dhcp-66-70-5 kernel: other info that might help us debug this:
Mar 11 17:11:22 dhcp-66-70-5 kernel: 2 locks held by swapper/0:
Mar 11 17:11:22 dhcp-66-70-5 kernel: #0: (rcu_read_lock){.+.+..}, at: [<ffffffff81468baa>] net_rx_action+0xc9/0x40f
Mar 11 17:11:22 dhcp-66-70-5 kernel: #1: (&(&napi->poll_lock)->rlock){+.-...}, at: [<ffffffff81468c39>] net_rx_action+0x158/0x40f
Mar 11 17:11:22 dhcp-66-70-5 kernel:
Mar 11 17:11:22 dhcp-66-70-5 kernel: stack backtrace:
Mar 11 17:11:22 dhcp-66-70-5 kernel: Pid: 0, comm: swapper Not tainted 2.6.34-rc1 #58
Mar 11 17:11:22 dhcp-66-70-5 kernel: Call Trace:
Mar 11 17:11:22 dhcp-66-70-5 kernel: <IRQ> [<ffffffff810a1985>] print_usage_bug+0x26b/0x283
Mar 11 17:11:22 dhcp-66-70-5 kernel: [<ffffffff810a4486>] ? check_usage_forwards+0x0/0x141
Mar 11 17:11:22 dhcp-66-70-5 kernel: [<ffffffff810a1e7d>] mark_lock+0x4e0/0x8ff
Mar 11 17:11:22 dhcp-66-70-5 kernel: [<ffffffff810a6ce3>] __lock_acquire+0xa0d/0xe55
Mar 11 17:11:22 dhcp-66-70-5 kernel: [<ffffffff810a9585>] lock_acquire+0x163/0x1aa
Mar 11 17:11:22 dhcp-66-70-5 kernel: [<ffffffff8146419f>] ? netif_receive_skb+0xe7/0x819
Mar 11 17:11:22 dhcp-66-70-5 kernel: [<ffffffff81552237>] _raw_spin_lock_irqsave+0x6c/0xe2
Mar 11 17:11:22 dhcp-66-70-5 kernel: [<ffffffff8146419f>] ? netif_receive_skb+0xe7/0x819
Mar 11 17:11:22 dhcp-66-70-5 kernel: [<ffffffff8146419f>] netif_receive_skb+0xe7/0x819
Mar 11 17:11:22 dhcp-66-70-5 kernel: [<ffffffff814649a8>] napi_skb_finish+0x37/0x6a
Mar 11 17:11:22 dhcp-66-70-5 kernel: [<ffffffff81465118>] napi_gro_receive+0x44/0x50
Mar 11 17:11:22 dhcp-66-70-5 kernel: [<ffffffffa01d8bdc>] tg3_poll_work+0x9c6/0xfab [tg3]
Mar 11 17:11:22 dhcp-66-70-5 kernel: [<ffffffff810a7063>] ? __lock_acquire+0xd8d/0xe55
Mar 11 17:11:22 dhcp-66-70-5 kernel: [<ffffffffa01d92bc>] tg3_poll+0xfb/0x322 [tg3]
Mar 11 17:11:22 dhcp-66-70-5 kernel: [<ffffffff81468c95>] net_rx_action+0x1b4/0x40f
Mar 11 17:11:22 dhcp-66-70-5 kernel: [<ffffffff81468baa>] ? net_rx_action+0xc9/0x40f
Mar 11 17:11:22 dhcp-66-70-5 kernel: [<ffffffff8106a808>] __do_softirq+0x194/0x35f
Mar 11 17:11:22 dhcp-66-70-5 kernel: [<ffffffff8100498c>] call_softirq+0x1c/0x4c
Mar 11 17:11:22 dhcp-66-70-5 kernel: [<ffffffff81006d10>] do_softirq+0x8c/0x181
Mar 11 17:11:22 dhcp-66-70-5 kernel: [<ffffffff8106a66b>] irq_exit+0xa5/0xae
Mar 11 17:11:22 dhcp-66-70-5 kernel: [<ffffffff8155c2aa>] do_IRQ+0x10a/0x136
Mar 11 17:11:22 dhcp-66-70-5 kernel: [<ffffffff81553453>] ret_from_intr+0x0/0xf
Mar 11 17:11:22 dhcp-66-70-5 kernel: <EOI> [<ffffffff81332544>] ? acpi_safe_halt+0x61/0x84
Mar 11 17:11:22 dhcp-66-70-5 kernel: [<ffffffff8133253b>] ? acpi_safe_halt+0x58/0x84
Mar 11 17:11:22 dhcp-66-70-5 kernel: [<ffffffff8133270e>] acpi_idle_enter_c1+0xd7/0x17b
Mar 11 17:11:22 dhcp-66-70-5 kernel: [<ffffffff815581b4>] ? __atomic_notifier_call_chain+0x92/0xa7
Mar 11 17:11:22 dhcp-66-70-5 kernel: [<ffffffff8142960f>] ? ladder_select_state+0x42/0x23d
Mar 11 17:11:22 dhcp-66-70-5 kernel: [<ffffffff81428439>] cpuidle_idle_call+0x104/0x1b4
Mar 11 17:11:22 dhcp-66-70-5 kernel: [<ffffffff810020df>] cpu_idle+0xfd/0x163
Mar 11 17:11:22 dhcp-66-70-5 kernel: [<ffffffff8152cb36>] rest_init+0x13a/0x145
Mar 11 17:11:22 dhcp-66-70-5 kernel: [<ffffffff8152c9fc>] ? rest_init+0x0/0x145
Mar 11 17:11:22 dhcp-66-70-5 kernel: [<ffffffff81c92702>] start_kernel+0x789/0x79d
Mar 11 17:11:22 dhcp-66-70-5 kernel: [<ffffffff81c912f4>] x86_64_start_reservations+0x104/0x10f
Mar 11 17:11:22 dhcp-66-70-5 kernel: [<ffffffff81c914df>] x86_64_start_kernel+0x1e0/0x1ee
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