From: Pavel Machek <pavel@ucw.cz>
To: Dmitry Vyukov <dvyukov@google.com>
Cc: syzkaller <syzkaller@googlegroups.com>,
Oleg Nesterov <oleg@redhat.com>,
Denys Vlasenko <dvlasenk@redhat.com>,
jan.kratochvil@redhat.com, palves@redhat.com,
Roland McGrath <roland@hack.frob.com>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: Unkillable processes due to PTRACE_TRACEME again
Date: Sat, 3 Dec 2016 20:11:13 +0100 [thread overview]
Message-ID: <20161203191113.GA13417@amd> (raw)
In-Reply-To: <CACT4Y+YUnM1kAZo6orq2oqjAvuYF6z47yZ5gjrKzT4gmQ7fktg@mail.gmail.com>
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Hi!
You cc-ed me on initial mail, I replied, and you removed me from cc. Ouch.
On Sat 2016-12-03 16:55:49, Dmitry Vyukov wrote:
> On Fri, Dec 2, 2016 at 10:02 PM, Pavel Machek <pavel@ucw.cz> wrote:
> > On Fri 2016-12-02 19:48:40, Dmitry Vyukov wrote:
> >> Hello,
> >>
> >> There was an issue discussed a year ago which leads to
> >> unkillalble/unwaitable zombie processes due to PTRACE_TRACEME:
> >> https://groups.google.com/d/msg/syzkaller/uGzwvhlCXAw/E-cfY2ejAgAJ
> >> and I though it has been fixed by "wait/ptrace: assume __WALL if the
> >> child is traced":
> >> https://groups.google.com/d/msg/syzkaller/caeB1ebZWAs/gcbvcM2HDAAJ
> >>
> >> I am not on 2caceb3294a78c389b462e7e236a4e744a53a474 (Dec 1). And see
> >
> > "Now on"?
>
> Yes.
>
> >> the same unwaitable zombie processes.
> >
> > Well.. I guess git bisect is one option...?
>
> I've checked on:
>
> commit 91c4e8ea8f05916df0c8a6f383508ac7c9e10dba
> Author: Oleg Nesterov <oleg@redhat.com>
> Date: Mon May 23 16:23:53 2016 -0700
> wait: allow sys_waitid() to accept __WNOTHREAD/__WCLONE/__WALL
>
> and the program hangs the same way. So it seems that it was just never fixed.
Ouch #2. Oleg, any ideas?
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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next prev parent reply other threads:[~2016-12-03 19:11 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-02 18:48 Unkillable processes due to PTRACE_TRACEME again Dmitry Vyukov
2016-12-02 21:02 ` Pavel Machek
2016-12-03 15:55 ` Dmitry Vyukov
2016-12-03 19:11 ` Pavel Machek [this message]
2016-12-05 10:46 ` Oleg Nesterov
2016-12-05 11:00 ` Oleg Nesterov
2016-12-05 14:07 ` Dmitry Vyukov
2016-12-05 16:59 ` Oleg Nesterov
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