Re: [syzbot] [kernel?] WARNING in class_register

[Greg KH]

On Sat, Apr 01, 2023 at 01:39:42PM -0700, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    a6d9e3034536 Add linux-next specific files for 20230330
> git tree:       linux-next
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=1496edcdc80000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=aceb117f7924508e
> dashboard link: https://syzkaller.appspot.com/bug?extid=ca3d9f693dfa69f61371
> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14f57859c80000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=167cc501c80000
> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/ec1f900ea929/disk-a6d9e303.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/fabbf89c0d22/vmlinux-a6d9e303.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/1ed05d6192fa/bzImage-a6d9e303.xz
> 
> The issue was bisected to:
> 
> commit dcfbb67e48a2becfce7990386e985b9c45098ee5
> Author: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
> Date:   Fri Mar 24 10:01:31 2023 +0000
> 
>     driver core: class: use lock_class_key already present in struct subsys_private
> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=10190b49c80000
> final oops:     https://syzkaller.appspot.com/x/report.txt?x=12190b49c80000
> console output: https://syzkaller.appspot.com/x/log.txt?x=14190b49c80000
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+ca3d9f693dfa69f61371@xxxxxxxxxxxxxxxxxxxxxxxxx
> Fixes: dcfbb67e48a2 ("driver core: class: use lock_class_key already present in struct subsys_private")

Should already be fixed by:
	https://lore.kernel.org/all/2023040126-blandness-duckling-bd55@gregkh/
which was a different syzbot-reported issue with this same commit.

thanks,

greg k-h