On 7/14/15 1:47 PM, Oleg Nesterov wrote:
On 07/06, Andrey Vagin wrote:
From: David Ahern <dsah...@gmail.com>
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,
Seriously? I'll find some way to track whether VMAs have been dumped for
a pid.
if (i >= n)
err = fill_vma(tsk, skb, cb, &progress, show_flags);
so this probably needs something like find_lock_task_mm().
ok.
Thanks for the review,
David
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