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Message-ID: <20150714174703.GA8088@redhat.com>
Date: Tue, 14 Jul 2015 19:47:03 +0200
From: Oleg Nesterov <oleg@...hat.com>
To: Andrey Vagin <avagin@...nvz.org>
Cc: linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
Andrew Morton <akpm@...ux-foundation.org>,
Cyrill Gorcunov <gorcunov@...nvz.org>,
Pavel Emelyanov <xemul@...allels.com>,
Roger Luethi <rl@...lgate.ch>, Arnd Bergmann <arnd@...db.de>,
Arnaldo Carvalho de Melo <acme@...nel.org>,
David Ahern <dsahern@...il.com>,
Andy Lutomirski <luto@...capital.net>,
Pavel Odintsov <pavel.odintsov@...il.com>
Subject: Re: [PATCH 20/24] task_diag: Only add VMAs for thread_group leader
On 07/06, Andrey Vagin wrote:
>
> From: David Ahern <dsahern@...il.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,
> 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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