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    SubjectRe: [patch] Real-Time Preemption, -RT-2.6.9-rc4-mm1-U9
    Ingo Molnar wrote:
    > i have released the -U9 Real-Time Preemption patch, which can be
    > downloaded from:
    >
    > http://redhat.com/~mingo/realtime-preempt/

    I have a reproducible BUG which I first hit in -U9 and it's in -U9.2
    too. It occurs always when a packet hits a REJECT rule in the INPUT
    chain of iptables.
    To reproduce: iptables -I INPUT 1 -p tcp --dport 666 -j REJECT
    ...and telnet your TCP port 666 from the network.


    BUG: semaphore recursion deadlock detected!
    .. current task ksoftirqd/0/2 is already holding f890a6d4.
    c0414ec4 f7c27f64 0000012c 00000001 f7c26000 00000000 f7c27f9c c0121687
    c03c8118 c0121758 c0121ae4 0000000a c03c8118 f7c26000 f7c26000
    00000000
    f7c27fa4 c0121770 f7c27fbc c0121ae4 00000001 fffffff6 f7c26000
    f7c25f70
    Call Trace:
    [<c0121687>] ___do_softirq+0x87/0xd0 (32)
    [<c0121758>] _do_softirq+0x8/0x30 (8)
    [<c0121ae4>] ksoftirqd+0x94/0xe0 (4)
    [<c0121770>] _do_softirq+0x20/0x30 (28)
    [<c0121ae4>] ksoftirqd+0x94/0xe0 (8)
    [<c013116a>] kthread+0xaa/0xb0 (24)
    [<c0121a50>] ksoftirqd+0x0/0xe0 (20)
    [<c01310c0>] kthread+0x0/0xb0 (12)
    [<c0103319>] kernel_thread_helper+0x5/0xc (16)
    preempt count: 00000003
    . 3-level deep critical section nesting:
    .. entry 1: down_write+0x1a4/0x1b0 / (ipt_do_table+0x6a/0x330 [ip_tables])
    .. entry 2: down_write+0x72/0x1b0 / (ipt_do_table+0x6a/0x330 [ip_tables])
    .. entry 3: print_traces+0x1d/0x90 / (show_stack+0x83/0xa0)


    Michal
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