Messages in this thread | | | Date | Sat, 3 Dec 2016 20:11:13 +0100 | From | Pavel Machek <> | Subject | Re: Unkillable processes due to PTRACE_TRACEME again |
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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 [unhandled content-type:application/pgp-signature] | |