linux-kernel - Re: [PATCH] workqueue: rust: add creation of workqueues

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Message-ID: <Z_4gb8ZAlbfhobgW@google.com>
Date: Tue, 15 Apr 2025 09:01:35 +0000
From: Alice Ryhl <aliceryhl@...gle.com>
To: Danilo Krummrich <dakr@...nel.org>, Tejun Heo <tj@...nel.org>
Cc: Miguel Ojeda <ojeda@...nel.org>, Lai Jiangshan <jiangshanlai@...il.com>, 
	Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>, 
	"Björn Roy Baron" <bjorn3_gh@...tonmail.com>, Benno Lossin <benno.lossin@...ton.me>, 
	Andreas Hindborg <a.hindborg@...nel.org>, Trevor Gross <tmgross@...ch.edu>, 
	Daniel Almeida <daniel.almeida@...labora.com>, Tamir Duberstein <tamird@...il.com>, 
	rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] workqueue: rust: add creation of workqueues

On Mon, Apr 14, 2025 at 08:15:41PM +0200, Danilo Krummrich wrote:
> On Fri, Apr 11, 2025 at 03:34:24PM +0000, Alice Ryhl wrote:
> > 
> > +/// An owned kernel work queue.
> 
> I'd suggest to document that dropping an OwnedQueue will wait for pending work.
> 
> Additionally, given that you're about to implement delayed work as well, we
> should also mention that destroy_workqueue() currently does not cover waiting
> for delayed work *before* it is scheduled and hence may cause WARN() splats or
> even UAF bugs.

Ah, that's a problem :(

Can we make destroy_workqueue() wait for delayed items too? And/or have
a variant of it that does so? I'm not sure what is best to do here...

Alice