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    SubjectRe: 2.6.17-rc5-mm3-lockdep -
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    Valdis.Kletnieks@vt.edu napsal(a):
    > It's living longer before it throws a complaint - we're making it out of
    > rc.sysinit and into rc5.d ;) This time we were in an 'id' command from this:
    >
    > test `id -u` = 0 || exit 4
    >
    > in either S11mcstrans or S18auditd. Looks like the Firewire (which I
    > don't actually use for anything) threw an IRQ at an inopportune time?
    >
    > (Obviously I stress different code paths than Arjan or Ingo. But if
    > I did the same things they did, it wouldn't be interesting.. ;)
    >
    > [ 464.687000] ( id-2700 |#0): new 569737200 us user-latency.
    > [ 464.687000] stopped custom tracer.
    > [ 464.687000]
    > [ 464.687000] ============================
    > [ 464.687000] [ BUG: illegal lock usage! ]
    > [ 464.687000] ----------------------------
    > [ 464.687000] illegal {in-hardirq-W} -> {hardirq-on-W} usage.
    > [ 464.687000] id/2700 [HC0[0]:SC0[1]:HE1:SE0] takes:
    > [ 464.687000] (&list->lock){++..}, at: [<c0351a07>] unix_stream_connect+0x334/0x408
    > [ 464.687000] {in-hardirq-W} state was registered at:
    > [ 464.687000] [<c012dd45>] lockdep_acquire+0x67/0x7f
    > [ 464.687000] [<c0383f11>] _spin_lock_irqsave+0x30/0x3f
    > [ 464.687000] [<c02fa93f>] skb_dequeue+0x18/0x49
    > [ 464.687000] [<f086b7f1>] hpsb_bus_reset+0x5e/0xa2 [ieee1394]
    > [ 464.687000] [<f0887007>] ohci_irq_handler+0x370/0x726 [ohci1394]
    > [ 464.687000] [<c013f9a8>] handle_IRQ_event+0x1d/0x52
    > [ 464.687000] [<c0140bc4>] handle_level_irq+0x97/0xe3
    > [ 464.687000] [<c01045d0>] do_IRQ+0x8b/0xaf
    > [ 464.687000] irq event stamp: 2964
    > [ 464.687000] hardirqs last enabled at (2963): [<c0384223>] _spin_unlock_irqrestore+0x3b/0x6d
    > [ 464.687000] hardirqs last disabled at (2962): [<c0383ef5>] _spin_lock_irqsave+0x14/0x3f
    > [ 464.687000] softirqs last enabled at (2956): [<c0119da0>] __do_softirq+0x9d/0xa5
    > [ 464.687000] softirqs last disabled at (2964): [<c0383f6b>] _spin_lock_bh+0x10/0x3a
    > [ 464.687000]
    > [ 464.687000] other info that might help us debug this:
    > [ 464.687000] 1 locks held by id/2700:
    > [ 464.687000] #0: (&u->lock){--..}, at: [<c03517bb>] unix_stream_connect+0xe8/0x408
    > [ 464.687000]
    > [ 464.687000] stack backtrace:
    > [ 464.687000] [<c01032d6>] show_trace_log_lvl+0x64/0x125
    > [ 464.687000] [<c0103865>] show_trace+0x1b/0x20
    > [ 464.687000] [<c010391c>] dump_stack+0x1f/0x24
    > [ 464.687000] [<c012bfb1>] print_usage_bug+0x1a8/0x1b4
    > [ 464.687000] [<c012c6c7>] mark_lock+0x2ba/0x4e5
    > [ 464.687000] [<c012d2b8>] __lockdep_acquire+0x476/0xa91
    > [ 464.687000] [<c012dd45>] lockdep_acquire+0x67/0x7f
    > [ 464.687000] [<c0383f87>] _spin_lock_bh+0x2c/0x3a
    > [ 464.687000] [<c0351a07>] unix_stream_connect+0x334/0x408
    > [ 464.687000] [<c02f7236>] sys_connect+0x6e/0xa3
    > [ 464.687000] [<c02f79da>] sys_socketcall+0x96/0x190
    > [ 464.687000] [<c03845e2>] sysenter_past_esp+0x63/0xa1
    >
    That one would be corrected now:
    http://lkml.org/lkml/2006/6/5/100

    regards,
    - --
    Jiri Slaby www.fi.muni.cz/~xslaby
    \_.-^-._ jirislaby@gmail.com _.-^-._/
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