linux-kernel - Re: Unkillable processes due to PTRACE

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Message-ID: <20161202210217.GA15126@amd>
Date:   Fri, 2 Dec 2016 22:02:17 +0100
From:   Pavel Machek <pavel@....cz>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     Oleg Nesterov <oleg@...hat.com>,
        Denys Vlasenko <dvlasenk@...hat.com>,
        jan.kratochvil@...hat.com, palves@...hat.com,
        Roland McGrath <roland@...k.frob.com>,
        syzkaller <syzkaller@...glegroups.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: Unkillable processes due to PTRACE_TRACEME again

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"?

> the same unwaitable zombie processes.

Well.. I guess git bisect is one option...?

Best regards,
								Pavel

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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