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From: "Eric W. Biederman" <ebiederm@xmission.com>
To: Mike Christie <michael.christie@oracle.com>
Cc: axboe@kernel.dk, hdanton@sina.com, mst@redhat.com,
	linux-kernel@vger.kernel.org,
	virtualization@lists.linux-foundation.org, hch@infradead.org,
	vverma@digitalocean.com, geert@linux-m68k.org,
	stefanha@redhat.com, christian.brauner@ubuntu.com
Subject: Re: [PATCH V6 01/10] Use copy_process in vhost layer
Date: Mon, 17 Jan 2022 11:31:22 -0600	[thread overview]
Message-ID: <874k62b76d.fsf@email.froward.int.ebiederm.org> (raw)
In-Reply-To: <783145b7-243b-b85e-e274-44ef6c0696b9@oracle.com> (Mike Christie's message of "Mon, 17 Jan 2022 10:41:05 -0600")

Mike Christie <michael.christie@oracle.com> writes:

> On 12/22/21 12:24 PM, Eric W. Biederman wrote:
>> All I am certain of is that you need to set
>> "args->exit_signal = -1;".  This prevents having to play games with
>> do_notify_parent.
>
> Hi Eric,
>
> I have all your review comments handled except this one. It's looking like it's
> more difficult than just setting the exit_signal=-1, so I wanted to check that
> I understood you.

[snip problems with exit_signal = -1]

>
> What do you think?

I was wrong.  I appear to have confused the thread and the non-thread
cases.

Perhaps I meant "args->exit_signal = 0".  That looks like
do_notify_parent won't send it, and thread_group_leader continues to do
the right thing.

Baring any additional confusion on my part that cleanly solves the
problem of how not to send a signal from a child process cleanly.

My apologies for sending you on a wild goose chase.

Eric


_______________________________________________
Virtualization mailing list
Virtualization@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/virtualization

WARNING: multiple messages have this Message-ID (diff)
From: "Eric W. Biederman" <ebiederm@xmission.com>
To: Mike Christie <michael.christie@oracle.com>
Cc: geert@linux-m68k.org, vverma@digitalocean.com, hdanton@sina.com,
	hch@infradead.org, stefanha@redhat.com, jasowang@redhat.com,
	mst@redhat.com, sgarzare@redhat.com,
	virtualization@lists.linux-foundation.org,
	christian.brauner@ubuntu.com, axboe@kernel.dk,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH V6 01/10] Use copy_process in vhost layer
Date: Mon, 17 Jan 2022 11:31:22 -0600	[thread overview]
Message-ID: <874k62b76d.fsf@email.froward.int.ebiederm.org> (raw)
In-Reply-To: <783145b7-243b-b85e-e274-44ef6c0696b9@oracle.com> (Mike Christie's message of "Mon, 17 Jan 2022 10:41:05 -0600")

Mike Christie <michael.christie@oracle.com> writes:

> On 12/22/21 12:24 PM, Eric W. Biederman wrote:
>> All I am certain of is that you need to set
>> "args->exit_signal = -1;".  This prevents having to play games with
>> do_notify_parent.
>
> Hi Eric,
>
> I have all your review comments handled except this one. It's looking like it's
> more difficult than just setting the exit_signal=-1, so I wanted to check that
> I understood you.

[snip problems with exit_signal = -1]

>
> What do you think?

I was wrong.  I appear to have confused the thread and the non-thread
cases.

Perhaps I meant "args->exit_signal = 0".  That looks like
do_notify_parent won't send it, and thread_group_leader continues to do
the right thing.

Baring any additional confusion on my part that cleanly solves the
problem of how not to send a signal from a child process cleanly.

My apologies for sending you on a wild goose chase.

Eric



  reply	other threads:[~2022-01-17 17:31 UTC|newest]

Thread overview: 57+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-29 19:46 [PATCH V6 01/10] Use copy_process in vhost layer Mike Christie
2021-11-29 19:46 ` Mike Christie
2021-11-29 19:46 ` [PATCH V6 01/10] fork: Make IO worker options flag based Mike Christie
2021-11-29 19:46   ` Mike Christie
2021-11-29 19:46 ` [PATCH V6 02/10] fork/vm: Move common PF_IO_WORKER behavior to new flag Mike Christie
2021-11-29 19:46   ` Mike Christie
2021-11-29 19:47 ` [PATCH V6 03/10] fork: add USER_WORKER flag to not dup/clone files Mike Christie
2021-11-29 19:47   ` Mike Christie
2021-11-29 19:47 ` [PATCH V6 04/10] fork: Add USER_WORKER flag to ignore signals Mike Christie
2021-11-29 19:47   ` Mike Christie
2021-11-29 19:47 ` [PATCH V6 05/10] signal: Perfom autoreap for PF_USER_WORKER Mike Christie
2021-11-29 19:47   ` Mike Christie
2021-12-17 18:42   ` Eric W. Biederman
2021-12-17 18:42     ` Eric W. Biederman
2021-11-29 19:47 ` [PATCH V6 06/10] fork: add helpers to clone a process for kernel use Mike Christie
2021-11-29 19:47   ` Mike Christie
2021-12-17 18:53   ` Eric W. Biederman
2021-12-17 18:53     ` Eric W. Biederman
2021-11-29 19:47 ` [PATCH V6 07/10] io_uring: switch to user_worker Mike Christie
2021-11-29 19:47   ` Mike Christie
2021-11-29 19:47 ` [PATCH V6 08/10] fork: remove create_io_thread Mike Christie
2021-11-29 19:47   ` Mike Christie
2021-11-29 19:47 ` [PATCH V6 09/10] vhost: move worker thread fields to new struct Mike Christie
2021-11-29 19:47   ` Mike Christie
2021-11-29 19:47 ` [PATCH V6 10/10] vhost: use user_worker to check RLIMITs Mike Christie
2021-11-29 19:47   ` Mike Christie
2021-12-17 19:01   ` Eric W. Biederman
2021-12-17 19:01     ` Eric W. Biederman
2021-12-08 20:34 ` [PATCH V6 01/10] Use copy_process in vhost layer Michael S. Tsirkin
2021-12-08 20:34   ` Michael S. Tsirkin
2021-12-08 22:13   ` michael.christie
2021-12-08 22:13     ` michael.christie
2021-12-09  9:32     ` Christian Brauner
2021-12-17 19:26 ` Eric W. Biederman
2021-12-17 19:26   ` Eric W. Biederman
2021-12-17 22:08   ` michael.christie
2021-12-17 22:08     ` michael.christie
2021-12-22  0:20     ` Eric W. Biederman
2021-12-22  0:20       ` Eric W. Biederman
2021-12-22 17:32       ` Mike Christie
2021-12-22 17:32         ` Mike Christie
2021-12-22 18:24         ` Eric W. Biederman
2021-12-22 18:24           ` Eric W. Biederman
2021-12-22 20:25           ` Michael S. Tsirkin
2021-12-22 20:25             ` Michael S. Tsirkin
2022-01-17 16:41           ` Mike Christie
2022-01-17 16:41             ` Mike Christie
2022-01-17 17:31             ` Eric W. Biederman [this message]
2022-01-17 17:31               ` Eric W. Biederman
2022-01-18 18:51               ` Mike Christie
2022-01-18 18:51                 ` Mike Christie
2022-01-18 19:00                 ` Mike Christie
2022-01-18 19:00                   ` Mike Christie
2022-01-18 19:12                 ` Eric W. Biederman
2022-01-18 19:12                   ` Eric W. Biederman
2022-02-02 21:02                   ` Mike Christie
2022-02-02 21:02                     ` Mike Christie

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