linux-kernel - [PATCH 0/3] vhost: Fix freezer/ps regressions

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Message-Id: <20230522025124.5863-1-michael.christie@oracle.com>
Date:   Sun, 21 May 2023 21:51:21 -0500
From:   Mike Christie <michael.christie@...cle.com>
To:     oleg@...hat.com, linux@...mhuis.info, nicolas.dichtel@...nd.com,
        axboe@...nel.dk, ebiederm@...ssion.com,
        torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, mst@...hat.com,
        sgarzare@...hat.com, jasowang@...hat.com, stefanha@...hat.com,
        brauner@...nel.org
Subject: [PATCH 0/3] vhost: Fix freezer/ps regressions

The following patches made over Linus's tree fix the 2 bugs:

1. vhost worker task shows up as a process forked from the parent
that did VHOST_SET_OWNER ioctl instead of a process under root/kthreadd.
This was causing breaking scripts.
2. vhost_tasks didn't disable or add support for freeze requests.

The following patches fix these issues by making the vhost_task task
a thread under the process that did the VHOST_SET_OWNER and uses
get_signal() to handle freeze and SIGSTOP/KILL signals which is required
when using CLONE_THREAD (really CLONE_THREAD requires CLONE_SIGHAND
which requires SIGKILL/STOP to be supported).