linux-kernel - Re: [git pull] d

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Message-ID: <CAHk-=wh=PVSpnca89fb+G6ZDBefbzbwFs+CG23+WGFpMyOHkiw@mail.gmail.com>
Date: Mon, 27 Jan 2025 11:12:11 -0800
From: Linus Torvalds <torvalds@...ux-foundation.org>
To: Sasha Levin <sashal@...nel.org>, kernelci@...ts.linux.dev
Cc: Al Viro <viro@...iv.linux.org.uk>, linux-fsdevel@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [git pull] d_revalidate pile

On Mon, 27 Jan 2025 at 09:19, Sasha Levin <sashal@...nel.org> wrote:
>
> With this pulled on top of Linus's tree, LKFT is managing to trigger
> kfence warnings:
>
> <3>[   62.180289] BUG: KFENCE: out-of-bounds read in d_same_name+0x4c/0xd0
> <3>[   62.180289]
> <3>[   62.182647] Out-of-bounds read at 0x00000000eedd4b55 (64B right of kfence-#174):
> <4>[   62.184178]  d_same_name+0x4c/0xd0

Bah. I've said this before, but I really wish LKFT would use debug
builds and run the warnings through scripts/decode_stacktrace.sh.

Getting filenames and line numbers (and inlining information!) for
stack traces can be really really useful.

I think you are using KernelCI builds (at least that was the case last
time), and apparently they are non-debug builds. And that's possibly
due to just resource issues (the debug info does take a lot more disk
space and makes link times much longer too). So it might not be easily
fixable.

But let's see if it might be an option to get this capability. So I'm
adding the kernelci list to see if somebody goes "Oh, that was just an
oversight" and might easily be made to happen. Fingers crossed.

              Linus