linux-kernel - Re: [CFT][PATCH v3] fork, vhost: Use CLONE

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Message-ID: <20230605151037.GE32275@redhat.com>
Date:   Mon, 5 Jun 2023 17:10:38 +0200
From:   Oleg Nesterov <oleg@...hat.com>
To:     michael.christie@...cle.com
Cc:     "Eric W. Biederman" <ebiederm@...ssion.com>, linux@...mhuis.info,
        nicolas.dichtel@...nd.com, axboe@...nel.dk,
        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: Re: [CFT][PATCH v3] fork, vhost: Use CLONE_THREAD to fix freezer/ps
 regression

On 06/03, michael.christie@...cle.com wrote:
>
> On 6/2/23 11:15 PM, Eric W. Biederman wrote:
> The problem is that as part of the flush the drivers/vhost/scsi.c code
> will wait for outstanding commands, because we can't free the device and
> it's resources before the commands complete or we will hit the accessing
> freed memory bug.

ignoring send-fd/clone issues, can we assume that the final fput/release
should always come from vhost_worker's sub-thread (which shares mm/etc) ?

Oleg.