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Groups > linux.kernel > #1535447
| From | Dmitry Vyukov <dvyukov@google.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: Unkillable processes due to PTRACE_TRACEME again |
| Date | 2016-12-03 17:00 +0100 |
| Message-ID | <sKkTg-3cV-17@gated-at.bofh.it> (permalink) |
| References | <sK14e-7tU-15@gated-at.bofh.it> <sK3fI-zX-45@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
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.
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Unkillable processes due to PTRACE_TRACEME again Dmitry Vyukov <dvyukov@google.com> - 2016-12-02 19:50 +0100
Re: Unkillable processes due to PTRACE_TRACEME again Pavel Machek <pavel@ucw.cz> - 2016-12-02 22:10 +0100
Re: Unkillable processes due to PTRACE_TRACEME again Dmitry Vyukov <dvyukov@google.com> - 2016-12-03 17:00 +0100
Re: Unkillable processes due to PTRACE_TRACEME again Pavel Machek <pavel@ucw.cz> - 2016-12-03 20:20 +0100
Re: Unkillable processes due to PTRACE_TRACEME again Oleg Nesterov <oleg@redhat.com> - 2016-12-05 11:50 +0100
Re: Unkillable processes due to PTRACE_TRACEME again Oleg Nesterov <oleg@redhat.com> - 2016-12-05 12:10 +0100
Re: Unkillable processes due to PTRACE_TRACEME again Dmitry Vyukov <dvyukov@google.com> - 2016-12-05 15:10 +0100
Re: Unkillable processes due to PTRACE_TRACEME again Oleg Nesterov <oleg@redhat.com> - 2016-12-05 18:10 +0100
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