[PATCH] Fix /proc access to dead thread group list oops
The pid_alive() check within the loop is incorrect. If we are within the tasklist lock and the thread group leader is valid then the thread chain will be fully intact. Instead, the check should be _outside_ the loop, since if the group leader no longer exists, the whole list is gone and we must not try to access it. Move the check around, and add comment. Bug-hunting and fix by Srivatsa Vaddagiri
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