linux-kernel - Re: C aggregate passing (Rust kernel policy)

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Message-ID: <7bbe958c-0d25-4c68-b562-1c296b7311b7@ralfj.de>
Date: Wed, 26 Feb 2025 15:37:33 +0100
From: Ralf Jung <post@...fj.de>
To: James Bottomley <James.Bottomley@...senPartnership.com>,
 Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
 Ventura Jack <venturajack85@...il.com>
Cc: Kent Overstreet <kent.overstreet@...ux.dev>,
 "H. Peter Anvin" <hpa@...or.com>, Alice Ryhl <aliceryhl@...gle.com>,
 Linus Torvalds <torvalds@...ux-foundation.org>, Gary Guo <gary@...yguo.net>,
 airlied@...il.com, boqun.feng@...il.com, david.laight.linux@...il.com,
 ej@...i.de, gregkh@...uxfoundation.org, hch@...radead.org,
 ksummit@...ts.linux.dev, linux-kernel@...r.kernel.org,
 rust-for-linux@...r.kernel.org
Subject: Re: C aggregate passing (Rust kernel policy)

On 26.02.25 15:26, James Bottomley wrote:
> On Wed, 2025-02-26 at 14:53 +0100, Miguel Ojeda wrote:
>> On Wed, Feb 26, 2025 at 2:03 PM Ventura Jack
>> <venturajack85@...il.com> wrote:
> [...]
>>> Exception/unwind safety may be another subject that increases
>>> the difficulty of writing unsafe Rust.
>>
>> Note that Rust panics in the kernel do not unwind.
> 
> I presume someone is working on this, right?  While rust isn't
> pervasive enough yet for this to cause a problem, dumping a backtrace
> is one of the key things we need to diagnose how something went wrong,
> particularly for user bug reports where they can't seem to bisect.

Rust panics typically print a backtrace even if they don't unwind. This works 
just fine in userland, but I don't know the state in the kernel.

Kind regards,
Ralf