Messages in this thread | | | Date | Wed, 3 Dec 2003 10:19:37 -0800 (PST) | From | Linus Torvalds <> | Subject | Re: kernel BUG at kernel/exit.c:792! |
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On Wed, 3 Dec 2003, Manfred Spraul wrote: > > But I don't understand the oops: > __exit_sighand clears current->sighand, and then in the next line > __unhash_process removes the thread from the task list. But that's under > write_lock_irq(&tasklist_lock), and get_tid_list runs under > read_lock(&tasklist_lock). It should be impossible that ->sighand is > NULL and the task is still listed in the task list.
The /proc filesystem will keep pointers to processes alive, and can reach them even if the process is otherwise gone.
This is why /proc ends up doing tests like "if (tsk->mm)" etc - because it literally can see processes after they are dead.
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