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    SubjectRe: linux hangs with printk on schedule()
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    On Mon, 2003-02-03 at 19:35, Haoqiang Zheng wrote:

    > I found Linux hangs when printk is inserted to the function schedule().
    > Sure, it doesn't make much sense to add such a line to schedule(). But Linux
    > shouldn't hang anyway, right? It's assumed that printk can be inserted
    > safely to anywhere. So, is it a bug of Linux?

    Its a known deadlock in 2.4:

    schedule -> printk() -> dmesg output -> klogd wakes up -> repeat

    It is not a hard fix and its basically one of a few places where you
    cannot call printk(), which is otherwise a very robust funciton.

    Robert Love

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