Date:	Sun, 25 Feb 2007 09:08:37 +0000
From:	Simon Arlott <simon@...ott.org>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: lockdep: inconsistent lock state ipv6_add_addr/sctp_v6_copy_addrlist
 (2.6.21-rc1)

This happens on every boot if more information is needed:

[   37.393715] =================================
[   37.393830] [ INFO: inconsistent lock state ]
[   37.393881] 2.6.21-rc1-git #146
[   37.393929] ---------------------------------
[   37.393979] inconsistent {softirq-on-R} -> {in-softirq-W} usage.
[   37.394040] hotplug/1072 [HC0[0]:SC1[2]:HE1:SE0] takes:
[   37.394092]  (&ndev->lock){-+-?}, at: [<b04a7944>] ipv6_add_addr+0x164/0x1e0
[   37.394308] {softirq-on-R} state was registered at:
[   37.394359]   [<b013fc42>] __lock_acquire+0x622/0xbb0
[   37.394515]   [<b0140652>] lock_acquire+0x62/0x80
[   37.394678]   [<b0511c65>] _read_lock+0x35/0x50
[   37.394834]   [<b050e200>] sctp_v6_copy_addrlist+0x30/0xc0
[   37.394993]   [<b04fbd32>] sctp_get_local_addr_list+0x32/0x60
[   37.395153]   [<b06e2390>] sctp_init+0x2c0/0x550
[   37.395317]   [<b06c0c55>] do_initcalls+0x35/0x120
[   37.395473]   [<b06c0d5c>] do_basic_setup+0x1c/0x30
[   37.395634]   [<b06c0dbf>] init+0x3f/0x90
[   37.395783]   [<b0104e77>] kernel_thread_helper+0x7/0x10
[   37.395939]   [<ffffffff>] 0xffffffff
[   37.396095] irq event stamp: 720
[   37.396146] hardirqs last  enabled at (720): [<b0140b8e>] debug_check_no_locks_freed+0xbe/0xd0
[   37.396280] hardirqs last disabled at (719): [<b0140afa>] debug_check_no_locks_freed+0x2a/0xd0
[   37.396413] softirqs last  enabled at (380): [<b0125247>] __do_softirq+0x97/0xb0
[   37.396548] softirqs last disabled at (597): [<b01252a7>] do_softirq+0x47/0x50
[   37.396683]
[   37.396685] other info that might help us debug this:
[   37.396778] 4 locks held by hotplug/1072:
[   37.396826]  #0:  (&mm->mmap_sem){----}, at: [<b0116ae6>] do_page_fault+0xb6/0x5a0
[   37.397066]  #1:  (&mm->page_table_lock){--..}, at: [<b015ad2e>] do_anonymous_page+0x9e/0x160
[   37.397306]  #2:  (&npinfo->poll_lock){-+..}, at: [<b043f028>] net_rx_action+0x158/0x1a0
[   37.397546]  #3:  (&tp->rx_lock){-+..}, at: [<b034fe5e>] rtl8139_poll+0x3e/0x120
[   37.397792]
[   37.397794] stack backtrace:
[   37.397885]  [<b010503a>] show_trace_log_lvl+0x1a/0x30
[   37.397972]  [<b0105062>] show_trace+0x12/0x20
[   37.398063]  [<b0105176>] dump_stack+0x16/0x20
[   37.398148]  [<b013e841>] print_usage_bug+0x151/0x160
[   37.398239]  [<b013ed13>] mark_lock+0x4c3/0x580
[   37.398324]  [<b013fc20>] __lock_acquire+0x600/0xbb0
[   37.398410]  [<b0140652>] lock_acquire+0x62/0x80
[   37.398496]  [<b0512005>] _write_lock+0x35/0x50
[   37.398582]  [<b04a7944>] ipv6_add_addr+0x164/0x1e0
[   37.398676]  [<b04a96fb>] addrconf_prefix_rcv+0x1bb/0x560
[   37.398765]  [<b04b5a71>] ndisc_router_discovery+0x431/0x600
[   37.398857]  [<b04b6612>] ndisc_rcv+0x92/0xc0
[   37.398942]  [<b04bb970>] icmpv6_rcv+0x2b0/0x2d0
[   37.399039]  [<b04a6a45>] ip6_input+0x1a5/0x3c0
[   37.399125]  [<b04a700a>] ip6_mc_input+0x3a/0x60
[   37.399211]  [<b04a667b>] ipv6_rcv+0x15b/0x380
[   37.399299]  [<b043ed31>] netif_receive_skb+0x271/0x2f0
[   37.399389]  [<b034fa92>] rtl8139_rx+0x142/0x340
[   37.399475]  [<b034fe79>] rtl8139_poll+0x59/0x120
[   37.399561]  [<b043ef59>] net_rx_action+0x89/0x1a0
[   37.399655]  [<b0125202>] __do_softirq+0x52/0xb0
[   37.399742]  [<b01252a7>] do_softirq+0x47/0x50
[   37.399827]  [<b0125365>] irq_exit+0x75/0x80
[   37.399912]  [<b0106a29>] do_IRQ+0x49/0x80
[   37.399997]  [<b0104cd2>] common_interrupt+0x2e/0x34
[   37.400084]  [<b0511fb5>] _spin_lock+0x35/0x50
[   37.400171]  [<b015ad2e>] do_anonymous_page+0x9e/0x160
[   37.400257]  [<b015b2e6>] __handle_mm_fault+0xc6/0x250
[   37.400347]  [<b0116bd4>] do_page_fault+0x1a4/0x5a0
[   37.400433]  [<b0512644>] error_code+0x74/0x7c
[   37.400521]  =======================

-- 
Simon Arlott

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