linux-kernel - Re: [syzbot] INFO: trying to register non-static key in hci_uart_tty

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Date:   Sat, 23 Oct 2021 15:47:10 +0200
From:   "Fabio M. De Francesco" <fmdefrancesco@...il.com>
To:     johan.hedberg@...il.com, linux-bluetooth@...r.kernel.org,
        linux-kernel@...r.kernel.org, luiz.dentz@...il.com,
        marcel@...tmann.org, syzkaller-bugs@...glegroups.com
Cc:     syzbot <syzbot+f2725165900304ec97b6@...kaller.appspotmail.com>
Subject: Re: [syzbot] INFO: trying to register non-static key in hci_uart_tty_receive (3)

On Saturday, October 23, 2021 1:54:24 AM CEST syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    519d81956ee2 Linux 5.15-rc6
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=16787178b00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=1f7f46d98a0da80e
> dashboard link: https://syzkaller.appspot.com/bug?
extid=f2725165900304ec97b6
> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils 
for Debian) 2.35.2
> 
> Unfortunately, I don't have any reproducer for this issue yet.
> 
> IMPORTANT: if you fix the issue, please add the following tag to the 
commit:
> Reported-by: syzbot+f2725165900304ec97b6@...kaller.appspotmail.com
> 
> INFO: trying to register non-static key.
> The code is fine but needs lockdep annotation, or maybe
> you didn't initialize this object before use?
> turning off the locking correctness validator.

Let's try the solution attached.

Fabio

#syz test
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
View attachment "hci_ldisc.c.diff" of type "text/x-patch" (573 bytes)