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    SubjectRe: 2.6.14-rc1 wait()/SIG_CHILD bevahiour
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    The test program is buggy.  Here is one clue:

    elm3b29:~ # strace -p 30023
    Process 30023 attached - interrupt to quit
    futex(0x2aaaaaddf118, FUTEX_WAIT, 2, NULL

    It's not anywhere near wait4. It's deadlocked in the rand() call inside
    rand_delay, called from sigchld_handler. You cannot safely call rand
    inside a signal handler, for exactly this reason. The signal came during
    another rand call and attempted to reenter. If this sort of deadlock is
    the failure mode of your real-world case, then it is probably an
    application bug. If this deadlock is just a mistake in your test program
    here, then you'll need to give us a corrected test program to pursue
    whatever real kernel issue you may have.


    Thanks,
    Roland
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