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    SubjectRe: Core dumps for threads
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    > Can anyone explain why this test is in routine `do_coredump'
    > in file `fs/exec.c' in the 2.4.0 kernel?
    >
    > if (!current->dumpable || atomic_read(&current->mm->mm_users) != 1)
    > goto fail;
    >
    > The only thing the test on `mm_users' seems to be doing is stopping
    > a thread process from dumping core. What's the rationale for this?

    The I/O to dump the core would race other changes on the mm. The right fix
    is probably to copy the mm (as fork does) then dump the copy.

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