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From: Aleksa Sarai <cyphar@cyphar.com>
To: Oleg Nesterov <oleg@redhat.com>
Cc: Christian Brauner <christian@brauner.io>,
	jannh@google.com, viro@zeniv.linux.org.uk,
	torvalds@linux-foundation.org, linux-kernel@vger.kernel.org,
	arnd@arndb.de, akpm@linux-foundation.org, dhowells@redhat.com,
	ebiederm@xmission.com, elena.reshetova@intel.com,
	keescook@chromium.org, luto@amacapital.net, luto@kernel.org,
	tglx@linutronix.de, linux-alpha@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org, linux-ia64@vger.kernel.org,
	linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org,
	linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
	linux-s390@vger.kernel.org, linux-sh@vger.kernel.org,
	sparclinux@vger.kernel.org, linux-xtensa@linux-xtensa.org,
	linux-api@vger.kernel.org, linux-arch@vger.kernel.org,
	linux-kselftest@vger.kernel.org, joel@joelfernandes.orgda
Subject: Re: [PATCH v1 1/2] pid: add pidfd_open()
Date: Thu, 16 May 2019 15:12:02 +0000	[thread overview]
Message-ID: <20190516151202.hrawrx7hxllmz2di@yavin> (raw)
In-Reply-To: <20190516150611.GC22564@redhat.com>

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On 2019-05-16, Oleg Nesterov <oleg@redhat.com> wrote:
> On 05/17, Aleksa Sarai wrote:
> > On 2019-05-16, Oleg Nesterov <oleg@redhat.com> wrote:
> > > On 05/16, Christian Brauner wrote:
> > > > With the introduction of pidfds through CLONE_PIDFD it is possible to
> > > > created pidfds at process creation time.
> > >
> > > Now I am wondering why do we need CLONE_PIDFD, you can just do
> > >
> > > 	pid = fork();
> > > 	pidfd_open(pid);
> >
> > While the race window would be exceptionally short, there is the
> > possibility that the child will die
> 
> Yes,
> 
> > and their pid will be recycled
> > before you do pidfd_open().
> 
> No.
> 
> Unless the caller's sub-thread does wait() before pidfd_open(), of course.
> Or unless you do signal(SIGCHILD, SIG_IGN).

What about CLONE_PARENT?

-- 
Aleksa Sarai
Senior Software Engineer (Containers)
SUSE Linux GmbH
<https://www.cyphar.com/>

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WARNING: multiple messages have this Message-ID (diff)
From: Aleksa Sarai <cyphar@cyphar.com>
To: Oleg Nesterov <oleg@redhat.com>
Cc: Christian Brauner <christian@brauner.io>,
	jannh@google.com, viro@zeniv.linux.org.uk,
	torvalds@linux-foundation.org, linux-kernel@vger.kernel.org,
	arnd@arndb.de, akpm@linux-foundation.org, dhowells@redhat.com,
	ebiederm@xmission.com, elena.reshetova@intel.com,
	keescook@chromium.org, luto@amacapital.net, luto@kernel.org,
	tglx@linutronix.de, linux-alpha@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org, linux-ia64@vger.kernel.org,
	linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org,
	linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
	linux-s390@vger.kernel.org, linux-sh@vger.kernel.org,
	sparclinux@vger.kernel.org, linux-xtensa@linux-xtensa.org,
	linux-api@vger.kernel.org, linux-arch@vger.kernel.org,
	linux-kselftest@vger.kernel.org, joel@joelfernandes.org,
	dancol@google.com, serge@hallyn.com,
	Geert Uytterhoeven <geert@linux-m68k.org>
Subject: Re: [PATCH v1 1/2] pid: add pidfd_open()
Date: Fri, 17 May 2019 01:12:02 +1000	[thread overview]
Message-ID: <20190516151202.hrawrx7hxllmz2di@yavin> (raw)
In-Reply-To: <20190516150611.GC22564@redhat.com>

[-- Attachment #1: Type: text/plain, Size: 922 bytes --]

On 2019-05-16, Oleg Nesterov <oleg@redhat.com> wrote:
> On 05/17, Aleksa Sarai wrote:
> > On 2019-05-16, Oleg Nesterov <oleg@redhat.com> wrote:
> > > On 05/16, Christian Brauner wrote:
> > > > With the introduction of pidfds through CLONE_PIDFD it is possible to
> > > > created pidfds at process creation time.
> > >
> > > Now I am wondering why do we need CLONE_PIDFD, you can just do
> > >
> > > 	pid = fork();
> > > 	pidfd_open(pid);
> >
> > While the race window would be exceptionally short, there is the
> > possibility that the child will die
> 
> Yes,
> 
> > and their pid will be recycled
> > before you do pidfd_open().
> 
> No.
> 
> Unless the caller's sub-thread does wait() before pidfd_open(), of course.
> Or unless you do signal(SIGCHILD, SIG_IGN).

What about CLONE_PARENT?

-- 
Aleksa Sarai
Senior Software Engineer (Containers)
SUSE Linux GmbH
<https://www.cyphar.com/>

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WARNING: multiple messages have this Message-ID (diff)
From: Aleksa Sarai <cyphar@cyphar.com>
To: Oleg Nesterov <oleg@redhat.com>
Cc: Christian Brauner <christian@brauner.io>,
	jannh@google.com, viro@zeniv.linux.org.uk,
	torvalds@linux-foundation.org, linux-kernel@vger.kernel.org,
	arnd@arndb.de, akpm@linux-foundation.org, dhowells@redhat.com,
	ebiederm@xmission.com, elena.reshetova@intel.com,
	keescook@chromium.org, luto@amacapital.net, luto@kernel.org,
	tglx@linutronix.de, linux-alpha@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org, linux-ia64@vger.kernel.org,
	linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org,
	linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
	linux-s390@vger.kernel.org, linux-sh@vger.kernel.org,
	sparclinux@vger.kernel.org, linux-xtensa@linux-xtensa.org,
	linux-api@vger.kernel.org, linux-arch@vger.kernel.org,
	linux-kselftest@vger.kernel.org, joel@joelfernandes.orgda
Subject: Re: [PATCH v1 1/2] pid: add pidfd_open()
Date: Fri, 17 May 2019 01:12:02 +1000	[thread overview]
Message-ID: <20190516151202.hrawrx7hxllmz2di@yavin> (raw)
In-Reply-To: <20190516150611.GC22564@redhat.com>

[-- Attachment #1: Type: text/plain, Size: 922 bytes --]

On 2019-05-16, Oleg Nesterov <oleg@redhat.com> wrote:
> On 05/17, Aleksa Sarai wrote:
> > On 2019-05-16, Oleg Nesterov <oleg@redhat.com> wrote:
> > > On 05/16, Christian Brauner wrote:
> > > > With the introduction of pidfds through CLONE_PIDFD it is possible to
> > > > created pidfds at process creation time.
> > >
> > > Now I am wondering why do we need CLONE_PIDFD, you can just do
> > >
> > > 	pid = fork();
> > > 	pidfd_open(pid);
> >
> > While the race window would be exceptionally short, there is the
> > possibility that the child will die
> 
> Yes,
> 
> > and their pid will be recycled
> > before you do pidfd_open().
> 
> No.
> 
> Unless the caller's sub-thread does wait() before pidfd_open(), of course.
> Or unless you do signal(SIGCHILD, SIG_IGN).

What about CLONE_PARENT?

-- 
Aleksa Sarai
Senior Software Engineer (Containers)
SUSE Linux GmbH
<https://www.cyphar.com/>

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WARNING: multiple messages have this Message-ID (diff)
From: cyphar at cyphar.com (Aleksa Sarai)
Subject: [PATCH v1 1/2] pid: add pidfd_open()
Date: Fri, 17 May 2019 01:12:02 +1000	[thread overview]
Message-ID: <20190516151202.hrawrx7hxllmz2di@yavin> (raw)
In-Reply-To: <20190516150611.GC22564@redhat.com>

On 2019-05-16, Oleg Nesterov <oleg at redhat.com> wrote:
> On 05/17, Aleksa Sarai wrote:
> > On 2019-05-16, Oleg Nesterov <oleg at redhat.com> wrote:
> > > On 05/16, Christian Brauner wrote:
> > > > With the introduction of pidfds through CLONE_PIDFD it is possible to
> > > > created pidfds at process creation time.
> > >
> > > Now I am wondering why do we need CLONE_PIDFD, you can just do
> > >
> > > 	pid = fork();
> > > 	pidfd_open(pid);
> >
> > While the race window would be exceptionally short, there is the
> > possibility that the child will die
> 
> Yes,
> 
> > and their pid will be recycled
> > before you do pidfd_open().
> 
> No.
> 
> Unless the caller's sub-thread does wait() before pidfd_open(), of course.
> Or unless you do signal(SIGCHILD, SIG_IGN).

What about CLONE_PARENT?

-- 
Aleksa Sarai
Senior Software Engineer (Containers)
SUSE Linux GmbH
<https://www.cyphar.com/>
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WARNING: multiple messages have this Message-ID (diff)
From: cyphar@cyphar.com (Aleksa Sarai)
Subject: [PATCH v1 1/2] pid: add pidfd_open()
Date: Fri, 17 May 2019 01:12:02 +1000	[thread overview]
Message-ID: <20190516151202.hrawrx7hxllmz2di@yavin> (raw)
Message-ID: <20190516151202.ZN_r9Je0Ot_xwRdzchAp-bskeCEvBsN2jbtrus_E_5g@z> (raw)
In-Reply-To: <20190516150611.GC22564@redhat.com>

On 2019-05-16, Oleg Nesterov <oleg@redhat.com> wrote:
> On 05/17, Aleksa Sarai wrote:
> > On 2019-05-16, Oleg Nesterov <oleg@redhat.com> wrote:
> > > On 05/16, Christian Brauner wrote:
> > > > With the introduction of pidfds through CLONE_PIDFD it is possible to
> > > > created pidfds at process creation time.
> > >
> > > Now I am wondering why do we need CLONE_PIDFD, you can just do
> > >
> > > 	pid = fork();
> > > 	pidfd_open(pid);
> >
> > While the race window would be exceptionally short, there is the
> > possibility that the child will die
> 
> Yes,
> 
> > and their pid will be recycled
> > before you do pidfd_open().
> 
> No.
> 
> Unless the caller's sub-thread does wait() before pidfd_open(), of course.
> Or unless you do signal(SIGCHILD, SIG_IGN).

What about CLONE_PARENT?

-- 
Aleksa Sarai
Senior Software Engineer (Containers)
SUSE Linux GmbH
<https://www.cyphar.com/>
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WARNING: multiple messages have this Message-ID (diff)
From: Aleksa Sarai <cyphar@cyphar.com>
To: Oleg Nesterov <oleg@redhat.com>
Cc: linux-ia64@vger.kernel.org, linux-sh@vger.kernel.org,
	linux-mips@vger.kernel.org, dhowells@redhat.com,
	joel@joelfernandes.org, linux-kselftest@vger.kernel.org,
	sparclinux@vger.kernel.org, linux-api@vger.kernel.org,
	elena.reshetova@intel.com, linux-arch@vger.kernel.org,
	linux-s390@vger.kernel.org, dancol@google.com,
	Geert Uytterhoeven <geert@linux-m68k.org>,
	Christian Brauner <christian@brauner.io>,
	serge@hallyn.com, linux-xtensa@linux-xtensa.org,
	keescook@chromium.org, arnd@arndb.de, jannh@google.com,
	linux-m68k@lists.linux-m68k.org, viro@zeniv.linux.org.uk,
	luto@kernel.org, tglx@linutronix.de,
	linux-arm-kernel@lists.infradead.org,
	linux-parisc@vger.kernel.org, torvalds@linux-foundation.org,
	linux-kernel@vger.kernel.org, luto@amacapital.net,
	ebiederm@xmission.com, linux-alpha@vger.kernel.org,
	akpm@linux-foundation.org, linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH v1 1/2] pid: add pidfd_open()
Date: Fri, 17 May 2019 01:12:02 +1000	[thread overview]
Message-ID: <20190516151202.hrawrx7hxllmz2di@yavin> (raw)
In-Reply-To: <20190516150611.GC22564@redhat.com>

[-- Attachment #1: Type: text/plain, Size: 922 bytes --]

On 2019-05-16, Oleg Nesterov <oleg@redhat.com> wrote:
> On 05/17, Aleksa Sarai wrote:
> > On 2019-05-16, Oleg Nesterov <oleg@redhat.com> wrote:
> > > On 05/16, Christian Brauner wrote:
> > > > With the introduction of pidfds through CLONE_PIDFD it is possible to
> > > > created pidfds at process creation time.
> > >
> > > Now I am wondering why do we need CLONE_PIDFD, you can just do
> > >
> > > 	pid = fork();
> > > 	pidfd_open(pid);
> >
> > While the race window would be exceptionally short, there is the
> > possibility that the child will die
> 
> Yes,
> 
> > and their pid will be recycled
> > before you do pidfd_open().
> 
> No.
> 
> Unless the caller's sub-thread does wait() before pidfd_open(), of course.
> Or unless you do signal(SIGCHILD, SIG_IGN).

What about CLONE_PARENT?

-- 
Aleksa Sarai
Senior Software Engineer (Containers)
SUSE Linux GmbH
<https://www.cyphar.com/>

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WARNING: multiple messages have this Message-ID (diff)
From: Aleksa Sarai <cyphar@cyphar.com>
To: Oleg Nesterov <oleg@redhat.com>
Cc: linux-ia64@vger.kernel.org, linux-sh@vger.kernel.org,
	linux-mips@vger.kernel.org, dhowells@redhat.com,
	joel@joelfernandes.org, linux-kselftest@vger.kernel.org,
	sparclinux@vger.kernel.org, linux-api@vger.kernel.org,
	elena.reshetova@intel.com, linux-arch@vger.kernel.org,
	linux-s390@vger.kernel.org, dancol@google.com,
	Geert Uytterhoeven <geert@linux-m68k.org>,
	Christian Brauner <christian@brauner.io>,
	serge@hallyn.com, linux-xtensa@linux-xtensa.org,
	keescook@chromium.org, arnd@arndb.de, jannh@google.com,
	linux-m68k@lists.linux-m68k.org, viro@zeniv.linux.org.uk,
	luto@kernel.org, tglx@linutronix.de,
	linux-arm-kernel@lists.infradead.org,
	linux-parisc@vger.kernel.org, torvalds@linux-foundation.org,
	linux-kernel@vger.kernel.org, luto@amacapital.net,
	ebiederm@xmission.com, linux-alpha@vger.kernel.org,
	akpm@linux-foundation.org, linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH v1 1/2] pid: add pidfd_open()
Date: Fri, 17 May 2019 01:12:02 +1000	[thread overview]
Message-ID: <20190516151202.hrawrx7hxllmz2di@yavin> (raw)
In-Reply-To: <20190516150611.GC22564@redhat.com>


[-- Attachment #1.1: Type: text/plain, Size: 922 bytes --]

On 2019-05-16, Oleg Nesterov <oleg@redhat.com> wrote:
> On 05/17, Aleksa Sarai wrote:
> > On 2019-05-16, Oleg Nesterov <oleg@redhat.com> wrote:
> > > On 05/16, Christian Brauner wrote:
> > > > With the introduction of pidfds through CLONE_PIDFD it is possible to
> > > > created pidfds at process creation time.
> > >
> > > Now I am wondering why do we need CLONE_PIDFD, you can just do
> > >
> > > 	pid = fork();
> > > 	pidfd_open(pid);
> >
> > While the race window would be exceptionally short, there is the
> > possibility that the child will die
> 
> Yes,
> 
> > and their pid will be recycled
> > before you do pidfd_open().
> 
> No.
> 
> Unless the caller's sub-thread does wait() before pidfd_open(), of course.
> Or unless you do signal(SIGCHILD, SIG_IGN).

What about CLONE_PARENT?

-- 
Aleksa Sarai
Senior Software Engineer (Containers)
SUSE Linux GmbH
<https://www.cyphar.com/>

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_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

WARNING: multiple messages have this Message-ID (diff)
From: Aleksa Sarai <cyphar@cyphar.com>
To: Oleg Nesterov <oleg@redhat.com>
Cc: Christian Brauner <christian@brauner.io>,
	jannh@google.com, viro@zeniv.linux.org.uk,
	torvalds@linux-foundation.org, linux-kernel@vger.kernel.org,
	arnd@arndb.de, akpm@linux-foundation.org, dhowells@redhat.com,
	ebiederm@xmission.com, elena.reshetova@intel.com,
	keescook@chromium.org, luto@amacapital.net, luto@kernel.org,
	tglx@linutronix.de, linux-alpha@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org, linux-ia64@vger.kernel.org,
	linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org,
	linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
	linux-s390@vger.kernel.org, linux-sh@vger.kernel.org,
	sparclinux@vger.kernel.org, linux-xtensa@linux-xtensa.org,
	linux-api@vger.kernel.org, linux-arch@vger.kernel.org,
	linux-kselftest@vger.kernel.org, joel@joelfernandes.org, da
Subject: Re: [PATCH v1 1/2] pid: add pidfd_open()
Date: Fri, 17 May 2019 01:12:02 +1000	[thread overview]
Message-ID: <20190516151202.hrawrx7hxllmz2di@yavin> (raw)
In-Reply-To: <20190516150611.GC22564@redhat.com>

[-- Attachment #1: Type: text/plain, Size: 922 bytes --]

On 2019-05-16, Oleg Nesterov <oleg@redhat.com> wrote:
> On 05/17, Aleksa Sarai wrote:
> > On 2019-05-16, Oleg Nesterov <oleg@redhat.com> wrote:
> > > On 05/16, Christian Brauner wrote:
> > > > With the introduction of pidfds through CLONE_PIDFD it is possible to
> > > > created pidfds at process creation time.
> > >
> > > Now I am wondering why do we need CLONE_PIDFD, you can just do
> > >
> > > 	pid = fork();
> > > 	pidfd_open(pid);
> >
> > While the race window would be exceptionally short, there is the
> > possibility that the child will die
> 
> Yes,
> 
> > and their pid will be recycled
> > before you do pidfd_open().
> 
> No.
> 
> Unless the caller's sub-thread does wait() before pidfd_open(), of course.
> Or unless you do signal(SIGCHILD, SIG_IGN).

What about CLONE_PARENT?

-- 
Aleksa Sarai
Senior Software Engineer (Containers)
SUSE Linux GmbH
<https://www.cyphar.com/>

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  reply	other threads:[~2019-05-16 15:12 UTC|newest]

Thread overview: 95+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-16 13:59 [PATCH v1 1/2] pid: add pidfd_open() Christian Brauner
2019-05-16 13:59 ` Christian Brauner
2019-05-16 13:59 ` Christian Brauner
2019-05-16 13:59 ` Christian Brauner
2019-05-16 13:59 ` christian
2019-05-16 13:59 ` Christian Brauner
2019-05-16 13:59 ` [PATCH v1 2/2] tests: add pidfd_open() tests Christian Brauner
2019-05-16 13:59   ` Christian Brauner
2019-05-16 13:59   ` Christian Brauner
2019-05-16 13:59   ` Christian Brauner
2019-05-16 13:59   ` christian
2019-05-16 13:59   ` Christian Brauner
2019-05-16 14:27 ` [PATCH v1 1/2] pid: add pidfd_open() Oleg Nesterov
2019-05-16 14:27   ` Oleg Nesterov
2019-05-16 14:27   ` Oleg Nesterov
2019-05-16 14:27   ` Oleg Nesterov
2019-05-16 14:27   ` oleg
2019-05-16 14:27   ` Oleg Nesterov
2019-05-16 14:27   ` Oleg Nesterov
2019-05-16 14:56   ` Aleksa Sarai
2019-05-16 14:56     ` Aleksa Sarai
2019-05-16 14:56     ` Aleksa Sarai
2019-05-16 14:56     ` Aleksa Sarai
2019-05-16 14:56     ` Aleksa Sarai
2019-05-16 14:56     ` cyphar
2019-05-16 14:56     ` Aleksa Sarai
2019-05-16 14:56     ` Aleksa Sarai
2019-05-16 15:06     ` Oleg Nesterov
2019-05-16 15:06       ` Oleg Nesterov
2019-05-16 15:06       ` Oleg Nesterov
2019-05-16 15:06       ` Oleg Nesterov
2019-05-16 15:06       ` Oleg Nesterov
2019-05-16 15:06       ` oleg
2019-05-16 15:06       ` Oleg Nesterov
2019-05-16 15:06       ` Oleg Nesterov
2019-05-16 15:12       ` Aleksa Sarai [this message]
2019-05-16 15:12         ` Aleksa Sarai
2019-05-16 15:12         ` Aleksa Sarai
2019-05-16 15:12         ` Aleksa Sarai
2019-05-16 15:12         ` Aleksa Sarai
2019-05-16 15:12         ` cyphar
2019-05-16 15:12         ` Aleksa Sarai
2019-05-16 15:12         ` Aleksa Sarai
2019-05-16 15:22         ` Oleg Nesterov
2019-05-16 15:22           ` Oleg Nesterov
2019-05-16 15:22           ` Oleg Nesterov
2019-05-16 15:22           ` Oleg Nesterov
2019-05-16 15:22           ` Oleg Nesterov
2019-05-16 15:22           ` oleg
2019-05-16 15:22           ` Oleg Nesterov
2019-05-16 15:22           ` Oleg Nesterov
2019-05-16 15:29           ` Christian Brauner
2019-05-16 15:29             ` Christian Brauner
2019-05-16 15:29             ` Christian Brauner
2019-05-16 15:29             ` Christian Brauner
2019-05-16 15:29             ` christian
2019-05-16 15:29             ` Christian Brauner
2019-05-16 15:29             ` Christian Brauner
2019-05-16 14:57   ` Christian Brauner
2019-05-16 14:57     ` Christian Brauner
2019-05-16 14:57     ` Christian Brauner
2019-05-16 14:57     ` Christian Brauner
2019-05-16 14:57     ` christian
2019-05-16 14:57     ` Christian Brauner
2019-05-16 14:57     ` Christian Brauner
2019-05-16 14:56 ` Geert Uytterhoeven
2019-05-16 14:56   ` Geert Uytterhoeven
2019-05-16 14:56   ` Geert Uytterhoeven
2019-05-16 14:56   ` Geert Uytterhoeven
2019-05-16 14:56   ` Geert Uytterhoeven
2019-05-16 14:56   ` geert
2019-05-16 14:56   ` Geert Uytterhoeven
2019-05-16 14:56   ` Geert Uytterhoeven
2019-05-16 14:58   ` Christian Brauner
2019-05-16 14:58     ` Christian Brauner
2019-05-16 14:58     ` Christian Brauner
2019-05-16 14:58     ` Christian Brauner
2019-05-16 14:58     ` Christian Brauner
2019-05-16 14:58     ` christian
2019-05-16 14:58     ` Christian Brauner
2019-05-16 14:58     ` Christian Brauner
2019-05-18  9:48 ` Joel Fernandes
2019-05-18  9:48   ` Joel Fernandes
2019-05-18  9:48   ` Joel Fernandes
2019-05-18  9:48   ` Joel Fernandes
2019-05-18  9:48   ` joel
2019-05-18  9:48   ` Joel Fernandes
2019-05-18  9:48   ` Joel Fernandes
2019-05-18 10:04   ` Christian Brauner
2019-05-18 10:04     ` Christian Brauner
2019-05-18 10:04     ` Christian Brauner
2019-05-18 10:04     ` Christian Brauner
2019-05-18 10:04     ` christian
2019-05-18 10:04     ` Christian Brauner
2019-05-18 10:04     ` Christian Brauner

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