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    SubjectRe: [PATCH -rt] buggy UART fix

    hm, i just got the deadlock below, most likely due to your serial fix.
    (never got this before) It's not 100% reproducible - booted the kernel a
    dozen times (with your patch applied, working on other stuff) before i
    got this deadlock.

    Ingo

    ==========================================
    [ BUG: lock recursion deadlock detected! |
    ------------------------------------------
    already locked: [c1075ea0] {&port->lock}
    .. ->owner: f24d48f2
    .. held by: IRQ 4: 2400 [f24d48f0, 57]
    ... acquired at: serial8250_interrupt+0xe2/0x14a
    -{current task's backtrace}----------------->
    [<c0103f86>] show_trace+0x18/0x1d (20)
    [<c0103fa6>] dump_stack+0x1b/0x1f (20)
    [<c013afda>] check_deadlock+0xf6/0x2b4 (24)
    [<c0130036>] task_blocks_on_lock+0x1f/0x231 (44)
    [<c02e77e9>] ___down_mutex+0x29a/0x3f3 (96)
    [<c02e8303>] _spin_lock+0x39/0x42 (24)
    [<c020f280>] serial8250_interrupt+0xe9/0x14a (36)
    [<c013cf8f>] handle_IRQ_event+0x50/0xbd (52)
    [<c013dcd1>] do_irqd+0x171/0x298 (32)
    [<c012cac3>] kthread+0xab/0xdc (36)
    [<c0100d71>] kernel_thread_helper+0x5/0xb (229810204)
    ---------------------------
    | preempt count: 00000001 ]
    | 1-level deep critical section nesting:
    ----------------------------------------
    .. [<c02e87de>] .... _raw_spin_lock+0x12/0x26
    .....[<c02e7575>] .. ( <= ___down_mutex+0x26/0x3f3)


    showing all tasks:
    hm, tasklist_lock locked, retrying... #1 #2 #3 #4 #5 #6 #7 #8 #9 #10 ignoring it.
    locked it.
    S init: 1 [c2db78f0, 120] (not blocked)
    S migration/0: 2 [c2dbb8f0, 0] (not blocked)
    S softirq-high/0: 3 [c2dbf8f0, 98] (not blocked)
    S softirq-timer/0: 4 [c2dc38f0, 98] (not blocked)
    S softirq-net-tx/: 5 [c2dc78f0, 98] (not blocked)
    S softirq-net-rx/: 6 [c2dcb8f0, 98] (not blocked)
    S softirq-block/0: 7 [c2dcf8f0, 98] (not blocked)
    S softirq-tasklet: 8 [c2dd38f0, 98] (not blocked)
    S watchdog/0: 9 [c2dd78f0, 0] (not blocked)
    S desched/0: 10 [c2ddb8f0, 105] (not blocked)
    S events/0: 11 [c2df88f0, 98] (not blocked)
    S khelper: 12 [c2dfd8f0, 111] (not blocked)
    S kthread: 13 [c2e1f8f0, 111] (not blocked)
    S kblockd/0: 15 [c2e4e8f0, 110] (not blocked)
    S kacpid: 16 [f7ea18f0, 112] (not blocked)
    S IRQ 9: 17 [f7ea88f0, 50] (not blocked)
    S pdflush: 186 [f7ec18f0, 117] (not blocked)
    S pdflush: 187 [f796f8f0, 115] (not blocked)
    S aio/0: 189 [f7ec88f0, 112] (not blocked)
    S kswapd0: 188 [f7ed18f0, 125] (not blocked)
    S IRQ 8: 772 [f7a0b8f0, 51] (not blocked)
    S kseriod: 776 [f79fb8f0, 110] (not blocked)
    S IRQ 12: 779 [f71398f0, 52] (not blocked)
    S IRQ 14: 816 [f715d8f0, 53] (not blocked)
    S IRQ 15: 817 [f7a128f0, 54] (not blocked)
    S IRQ 1: 834 [f721e8f0, 55] (not blocked)
    S kjournald: 838 [f71348f0, 115] (not blocked)
    S kjournald: 1833 [f676b8f0, 123] (not blocked)
    S udevd: 1836 [f61978f0, 112] (not blocked)
    S IRQ 16: 2114 [f650a8f0, 56] (not blocked)
    S portmap: 2214 [f666c8f0, 119] (not blocked)
    S acpid: 2247 [f60268f0, 116] (not blocked)
    S sshd: 2257 [f71f98f0, 118] (not blocked)
    M distccd: 2287 [f60068f0, 120] (not blocked)
    S distccd: 2288 [f63078f0, 125] (not blocked)
    S gpm: 2296 [f60808f0, 116] (not blocked)
    S crond: 2304 [f60b08f0, 119] (not blocked)
    S distccd: 2319 [f63c18f0, 121] (not blocked)
    S distccd: 2320 [f63348f0, 121] (not blocked)
    S xfs: 2327 [f60c78f0, 118] (not blocked)
    S atd: 2342 [f62b18f0, 119] (not blocked)
    S distccd: 2350 [f63928f0, 121] (not blocked)
    S dbus-daemon: 2351 [f63628f0, 116] (not blocked)
    S hald: 2359 [f2cd98f0, 115] (not blocked)
    S distccd: 2364 [f284e8f0, 121] (not blocked)
    S hald-addon-acpi: 2365 [f2a328f0, 118] (not blocked)
    S distccd: 2373 [f2ac38f0, 121] (not blocked)
    S su: 2381 [f61228f0, 118] (not blocked)
    S agetty: 2386 [f60f38f0, 116] (not blocked)
    S mingetty: 2387 [f66708f0, 118] (not blocked)
    R mingetty: 2388 [f2b4e8f0, 118] (not blocked)
    S mingetty: 2389 [f29a38f0, 118] (not blocked)
    S mingetty: 2390 [f242c8f0, 118] (not blocked)
    S mingetty: 2391 [f24478f0, 118] (not blocked)
    R mingetty: 2392 [f24618f0, 118] (not blocked)
    S bash: 2399 [f24c38f0, 118] (not blocked)
    D IRQ 4: 2400 [f24d48f0, 57] (not blocked)
    R udev: 2403 [f25468f0, 116] (not blocked)
    S udev: 2418 [f26318f0, 117] (not blocked)
    R default.hotplug: 2434 [f20008f0, 119] (not blocked)
    S udev: 2438 [f255a8f0, 116] (not blocked)
    R default.hotplug: 2442 [f21e98f0, 119] (not blocked)
    M udevd: 2452 [f20f38f0, 119] (not blocked)
    S udev: 2464 [f26758f0, 118] (not blocked)
    S udev: 2472 [f20648f0, 116] (not blocked)
    R 05-pam_console.: 2473 [f25428f0, 118] (not blocked)
    D default.hotplug: 2475 [f24cf8f0, 118] blocked on: [c03565a4] {drivers/char/tty_io.c:133}
    .. ->owner: f2b4e8f2
    .. held by: mingetty: 2388 [f2b4e8f0, 118]
    ... acquired at: release_dev+0x1f1/0x671
    R egrep: 2478 [f23178f0, 118] (not blocked)
    D udevsend: 2479 [f23198f0, 113] blocked on: [c03cd2c0] {kernel/fork.c:67}
    .. ->owner: f1ca38f2
    .. held by: udevd: 2482 [f1ca38f0, 116]
    ... acquired at: sys_setpriority+0x4c/0x1c3
    S udev: 2480 [f24c68f0, 115] (not blocked)
    R 05-pam_console.: 2481 [f27c98f0, 118] (not blocked)
    R udevd: 2482 [f1ca38f0, 116] (not blocked)

    =============================================

    [ turning off deadlock detection.Please report this trace. ]

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