linux-kernel - Re: [syzbot] [io-uring?] KMSAN: uninit-value in io_rw

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Date: Fri, 9 Feb 2024 15:14:11 -0700
From: Jens Axboe <axboe@...nel.dk>
To: syzbot <syzbot+0198afa90d8c29ef9557@...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_rw_fail (2)

On 2/9/24 3:10 PM, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    9f8413c4a66f Merge tag 'cgroup-for-6.8' of git://git.kerne..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=1743d3e4180000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=656820e61b758b15
> dashboard link: https://syzkaller.appspot.com/bug?extid=0198afa90d8c29ef9557
> compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

This was fixed a while back, not sure why an old kernel is being tested. But
in any case, the result of this was just garbage in cqe->res for a request
that was prematurely errored. Nothing to worry about. In any case:

#syz fix: io_uring/rw: ensure io->bytes_done is always initialized

-- 
Jens Axboe