From: Greg KH <gregkh@linuxfoundation.org>
To: zhoumin <teczm@foxmail.com>
Cc: rafael@kernel.org, dakr@kernel.org, akpm@linux-foundation.org,
linux-kernel@vger.kernel.org
Subject: Re: [RFC PATCH] kobject: fix uevent helper execution order issues
Date: Tue, 19 Aug 2025 20:29:12 +0200 [thread overview]
Message-ID: <2025081956-untie-elude-7880@gregkh> (raw)
In-Reply-To: <tencent_22B2504A61A3281D6A2590CB43ABCCEC790A@qq.com>
On Wed, Aug 20, 2025 at 01:18:28AM +0800, zhoumin wrote:
> The current use of the UMH_NO_WAIT parameter does not guarantee the
> sequential execution of CONFIG_STATIC_USERMODEHELPER_PATH.
There is never any such guarantee. Unless you are on a single processor
system.
> For example, when fdisk completes and issues a BLKRRPART ioctl command,
> kernel first sending remove events followed by an add events. However,
> process CONFIG_STATIC_USERMODEHELPER_PATH may execute
> out-of-order—potentially handling the add before the remove. This can
> result in the new partition being unexpectedly unmounted instead of mounted
> as intended.
Why are you not looking at the SEQNUM value? That should be what orders
the events, right? Otherwise how would any of this work? :)
Also, what usermode helper program are you using that requires a binary?
What is wrong with udev?
thanks,
greg k-h
next prev parent reply other threads:[~2025-08-19 18:29 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-08-19 17:18 [RFC PATCH] kobject: fix uevent helper execution order issues zhoumin
2025-08-19 18:29 ` Greg KH [this message]
2025-08-20 14:04 ` zhoumin
2025-08-20 14:23 ` Greg KH
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=2025081956-untie-elude-7880@gregkh \
--to=gregkh@linuxfoundation.org \
--cc=akpm@linux-foundation.org \
--cc=dakr@kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=rafael@kernel.org \
--cc=teczm@foxmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.