On 07/06, Andrey Vagin wrote:
>
> From: David Ahern <[email protected]>
>
> threads of a process share the same VMAs, so when dumping all threads
> for all processes only push vma data for group leader.
...
> @@ -492,6 +493,13 @@ static int task_diag_fill(struct task_struct *tsk,
> struct sk_buff *skb,
> }
>
> if (show_flags & TASK_DIAG_SHOW_VMA) {
> + /* if the request is to dump all threads of all processes
> + * only show VMAs for group leader.
> + */
> + if (req->dump_strategy == TASK_DIAG_DUMP_ALL_THREAD &&
> + !thread_group_leader(tsk))
> + goto done;
> +
This doesn't look right, group leader can be a zombie with ->mm == NULL,
> if (i >= n)
> err = fill_vma(tsk, skb, cb, &progress, show_flags);
so this probably needs something like find_lock_task_mm().
Oleg.
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