From: Andrew Morton <akpm@linux-foundation.org>
To: Andrei Vagin <avagin@gmail.com>
Cc: Oleg Nesterov <oleg@redhat.com>,
linux-kernel@vger.kernel.org,
"Eric W. Biederman" <ebiederm@xmission.com>
Subject: Re: [PATCH v2] kernel: release ptraced tasks before zap_pid_ns_processes
Date: Thu, 10 Jan 2019 15:37:47 -0800 [thread overview]
Message-ID: <20190110153747.75787a99b380f415ee38d145@linux-foundation.org> (raw)
In-Reply-To: <20190110175200.12442-1-avagin@gmail.com>
On Thu, 10 Jan 2019 09:52:00 -0800 Andrei Vagin <avagin@gmail.com> wrote:
> Currently, exit_ptrace() adds all ptraced tasks in a dead list, than
> zap_pid_ns_processes() waits all tasks in a current pidns, and only
> then tasks from the dead list are released.
>
> zap_pid_ns_processes() can stuck on waiting tasks from the dead list. In
> this case, we will have one unkillable process with one or more dead
> children.
>
> Thanks to Oleg for the advice to release tasks in find_child_reaper().
>
> Fixes: 7c8bd2322c7f ("exit: ptrace: shift "reap dead" code from exit_ptrace() to forget_original_parent()")
>
> Cc: "Eric W. Biederman" <ebiederm@xmission.com>
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Signed-off-by: Oleg Nesterov <oleg@redhat.com>
> Signed-off-by: Andrei Vagin <avagin@gmail.com>
Does this warrant a -stable backport? 7c8bd2322c7f was 4+ years ago...
next prev parent reply other threads:[~2019-01-10 23:37 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-10 17:52 [PATCH v2] kernel: release ptraced tasks before zap_pid_ns_processes Andrei Vagin
2019-01-10 23:37 ` Andrew Morton [this message]
2019-01-11 15:39 ` Oleg Nesterov
2019-02-26 9:19 ` Jiri Slaby
2019-02-26 15:30 ` Oleg Nesterov
2019-02-27 8:03 ` Jiri Slaby
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20190110153747.75787a99b380f415ee38d145@linux-foundation.org \
--to=akpm@linux-foundation.org \
--cc=avagin@gmail.com \
--cc=ebiederm@xmission.com \
--cc=linux-kernel@vger.kernel.org \
--cc=oleg@redhat.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).