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    Subjectmmotm 2010-11-23 + autogroups -> inconsistent lock state
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    On Tue, 23 Nov 2010 16:13:06 PST, akpm@linux-foundation.org said:
    > The mm-of-the-moment snapshot 2010-11-23-16-12 has been uploaded to
    >
    > http://userweb.kernel.org/~akpm/mmotm/

    (I appear to be on a roll tonight - 3 splats before I even had a chance to login. :)

    mmotm + Ingo's cleanup of Mike's autogroups patch.

    [ 114.569222] =================================
    [ 114.578171] [ INFO: inconsistent lock state ]
    [ 114.578171] 2.6.37-rc3-mmotm1123 #3
    [ 114.578171] ---------------------------------
    [ 114.578171] inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage.
    [ 114.578171] kworker/0:0/0 [HC1[1]:SC0[0]:HE0:SE1] takes:
    [ 114.578171] (&(&sighand->siglock)->rlock){?.+...}, at: [<ffffffff8104bfb1>] __lock_task_sighand+0x88/0xd6
    [ 114.578171] {HARDIRQ-ON-W} state was registered at:
    [ 114.578171] [<ffffffff8106a9a9>] __lock_acquire+0x358/0xd4e
    [ 114.578171] [<ffffffff8106b8b1>] lock_acquire+0x100/0x126
    [ 114.578171] [<ffffffff8155a849>] _raw_spin_lock+0x36/0x45
    [ 114.578171] [<ffffffff81030bc6>] sched_autogroup_fork+0x30/0x61
    [ 114.578171] [<ffffffff8103995a>] copy_process+0x994/0x1325
    [ 114.578171] [<ffffffff8103a4ca>] do_fork+0x1ae/0x3e3
    [ 114.578171] [<ffffffff81009603>] kernel_thread+0x6b/0x6d
    [ 114.578171] [<ffffffff8105832e>] kthreadd+0xdd/0x11f
    [ 114.578171] [<ffffffff810035d4>] kernel_thread_helper+0x4/0x10
    [ 114.578171] irq event stamp: 1137212
    [ 114.578171] hardirqs last enabled at (1137209): [<ffffffff8155ae6f>] _raw_spin_unlock_irqrestore+0x3a/0x80
    [ 114.578171] hardirqs last disabled at (1137210): [<ffffffff8155b467>] save_args+0x67/0x70
    [ 114.578171] softirqs last enabled at (1137212): [<ffffffff810414f3>] _local_bh_enable+0xe/0x10
    [ 114.578171] softirqs last disabled at (1137211): [<ffffffff81041edd>] irq_enter+0x3d/0x6f
    [ 114.578171]
    [ 114.578171] other info that might help us debug this:
    [ 114.578171] 3 locks held by kworker/0:0/0:
    [ 114.578171] #0: (&(&new_timer->it_lock)->rlock){-.....}, at: [<ffffffff81056e7b>] posix_timer_fn+0x24/0xc7
    [ 114.578171] #1: (rcu_read_lock){.+.+..}, at: [<ffffffff81056d77>] rcu_read_lock+0x0/0x35
    [ 114.578171] #2: (rcu_read_lock){.+.+..}, at: [<ffffffff8104a6e6>] rcu_read_lock+0x0/0x35
    [ 114.578171]
    [ 114.578171] stack backtrace:
    [ 114.578171] Pid: 0, comm: kworker/0:0 Tainted: G W 2.6.37-rc3-mmotm1123 #3
    [ 114.578171] Call Trace:
    [ 114.578171] <IRQ> [<ffffffff8106a467>] valid_state+0x17c/0x18e
    [ 114.578171] [<ffffffff81069d2c>] ? check_usage_forwards+0x0/0x87
    [ 114.578171] [<ffffffff8106a558>] mark_lock+0xdf/0x1d8
    [ 114.578171] [<ffffffff81069d2c>] ? check_usage_forwards+0x0/0x87
    [ 114.578171] [<ffffffff8106a928>] __lock_acquire+0x2d7/0xd4e
    [ 114.578171] [<ffffffff8106a4a6>] ? mark_lock+0x2d/0x1d8
    [ 114.578171] [<ffffffff8104bfb1>] ? __lock_task_sighand+0x88/0xd6
    [ 114.578171] [<ffffffff8106b8b1>] lock_acquire+0x100/0x126
    [ 114.578171] [<ffffffff8104bfb1>] ? __lock_task_sighand+0x88/0xd6
    [ 114.578171] [<ffffffff8155a942>] _raw_spin_lock_irqsave+0x44/0x57
    [ 114.578171] [<ffffffff8104bfb1>] ? __lock_task_sighand+0x88/0xd6
    [ 114.578171] [<ffffffff8104bfb1>] __lock_task_sighand+0x88/0xd6
    [ 114.578171] [<ffffffff8104c6b3>] send_sigqueue+0x51/0x162
    [ 114.578171] [<ffffffff81056e42>] posix_timer_event+0x3f/0x54
    [ 114.578171] [<ffffffff81056ea1>] posix_timer_fn+0x4a/0xc7
    [ 114.578171] [<ffffffff812294fd>] ? do_raw_spin_unlock+0xd0/0xfa
    [ 114.578171] [<ffffffff8105bb7e>] __run_hrtimer+0x13e/0x27a
    [ 114.578171] [<ffffffff81056e57>] ? posix_timer_fn+0x0/0xc7
    [ 114.578171] [<ffffffff8105c5f3>] hrtimer_interrupt+0xea/0x1d6
    [ 114.578171] [<ffffffff8101ad4f>] smp_apic_timer_interrupt+0x74/0x87
    [ 114.578171] [<ffffffff81003193>] apic_timer_interrupt+0x13/0x20
    [ 114.578171] <EOI> [<ffffffff81000cf5>] ? cpu_idle+0x42/0x14e
    [ 114.578171] [<ffffffff81000dd5>] ? cpu_idle+0x122/0x14e
    [ 114.578171] [<ffffffff81b57170>] start_secondary+0x1a9/0x1ad
    ~
    [unhandled content-type:application/pgp-signature]
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