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Message-ID: <82a0cfca-c1d2-4d53-a00d-8283ddd81621@kernel.dk>
Date: Wed, 24 Jul 2024 15:04:46 -0600
From: Jens Axboe <axboe@...nel.dk>
To: syzbot <syzbot+82609b8937a4458106ca@...kaller.appspotmail.com>,
asml.silence@...il.com, io-uring@...r.kernel.org,
linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [io-uring?] KMSAN: uninit-value in
io_req_task_work_add_remote
On 7/24/24 3:03 PM, syzbot wrote:
> Hello,
>
> syzbot has tested the proposed patch and the reproducer did not trigger any issue:
>
> Reported-by: syzbot+82609b8937a4458106ca@...kaller.appspotmail.com
> Tested-by: syzbot+82609b8937a4458106ca@...kaller.appspotmail.com
>
> Tested on:
>
> commit: c33ffdb7 Merge tag 'phy-for-6.11' of git://git.kernel...
> git tree: upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=17d29bb5980000
> kernel config: https://syzkaller.appspot.com/x/.config?x=f26f43c6f7db5ad2
> dashboard link: https://syzkaller.appspot.com/bug?extid=82609b8937a4458106ca
> compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
> patch: https://syzkaller.appspot.com/x/patch.diff?x=120b7dad980000
>
> Note: testing is done by a robot and is best-effort only.
As I figured... No idea what's going on here, nr_tw is what is being
complained about and it's _clearly_ initialized. Randomly disabling a
branch that won't touch it off this path (hence it should be a no-op in
terms of code executed messing with nr_tw) makes it go away.
--
Jens Axboe
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