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    SubjectRe: [patch] Real-Time Preemption, -RT-2.6.10-rc1-mm3-V0.7.25-1
    Ingo Molnar wrote:

    >* Gunther Persoons <gunther_persoons@spymac.com> wrote:
    >
    >
    >
    >>I cant use my pcmcia wireless network card with this version, i can
    >>use it with V0.7.25-0. dhcpcd and ifconfig lock when i try to use
    >>them. config attached.
    >>
    >>
    >
    >extremely weird - there simply was no change between -0 and -1 that
    >could have affected it. If you do this on the -1 kernel:
    >
    > echo 0 > /proc/sys/kernel/preempt_wakeup_timing
    > echo 1 > /proc/sys/kernel/debug_direct_keyboard
    >
    >then you'll get precisely the -0 kernel, bit for bit. (plus the symbol
    >export fix in rtc.ko, which should have zero relevance to your setup.)
    >
    >[note that debug_direct_keyboard is dangerous.]
    >
    >so i believe the explanation has to be something else:
    >
    > - are you sure the build is correct?
    >
    > - are you sure it still works with the -0 kernel, maybe the bug is
    > transient?
    >
    > Ingo
    >
    >
    >
    this bug i got with .26
    wget:12388 BUG: lock held at task exit time!
    [c03ec764] {kernel_sem.lock}
    .. held by: wget:12388 [c87d2680, 116]
    ... acquired at: __lock_text_start+0x2c/0x63
    wget/12388: BUG in __up_mutex at kernel/rt.c:1076
    [<c01395b0>] __up_mutex+0x2a3/0x509 (8)
    [<c037f3b0>] __sched_text_start+0x508/0x64b (36)
    [<c013a637>] up+0xef/0x104 (24)
    [<c037f3b0>] __sched_text_start+0x508/0x64b (12)
    [<c037f3b0>] __sched_text_start+0x508/0x64b (20)
    [<c012480d>] do_exit+0x2d8/0x515 (8)
    [<c0138126>] printk_lock+0x7f/0xc1 (4)
    [<c0381136>] __lock_text_start+0x2c/0x63 (36)
    [<c012480d>] do_exit+0x2d8/0x515 (32)
    [<c012ea47>] get_signal_to_deliver+0x21e/0x379 (16)
    [<c0124ab8>] do_group_exit+0x3f/0xcc (28)
    [<c012ea47>] get_signal_to_deliver+0x21e/0x379 (8)
    [<c012ea73>] get_signal_to_deliver+0x24a/0x379 (24)
    [<c0105f88>] do_signal+0xa4/0x174 (44)
    [<c014725b>] free_hot_page+0x20/0x24 (112)
    [<c0177541>] poll_freewait+0x38/0x40 (12)
    [<c0178254>] sys_poll+0x18b/0x21f (16)
    [<c0177549>] __pollwait+0x0/0xc6 (36)
    [<c010608d>] do_notify_resume+0x35/0x38 (24)
    [<c010620e>] work_notifysig+0x13/0x15 (8)
    ---------------------------
    | preempt count: 00000004 ]
    | 4-level deep critical section nesting:
    ----------------------------------------
    .. [<c037eef2>] .... __sched_text_start+0x4a/0x64b
    .....[<00000000>] .. ( <= 0x0)
    .. [<c013a5f1>] .... up+0xa9/0x104
    .....[<00000000>] .. ( <= 0x0)
    .. [<c0139665>] .... __up_mutex+0x358/0x509
    .....[<00000000>] .. ( <= 0x0)
    .. [<c013b1fe>] .... print_traces+0x14/0x44
    .....[<00000000>] .. ( <= 0x0)

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