linux-kernel - Re: [syzbot] [kernfs?] possible deadlock in __kernfs

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Date: Tue, 25 Jun 2024 08:27:39 +0900
From: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To: syzbot <syzbot+4762dd74e32532cda5ff@...kaller.appspotmail.com>,
        syzkaller-bugs@...glegroups.com, tj@...nel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Dave Jiang <dave.jiang@...el.com>, Ira Weiny <ira.weiny@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Ashish Sangwan <a.sangwan@...sung.com>,
        Namjae Jeon
 <namjae.jeon@...sung.com>,
        Dirk Behme <dirk.behme@...bosch.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-kernel@...r.kernel.org
Subject: Re: [syzbot] [kernfs?] possible deadlock in __kernfs_remove

This dependency is added by recent bug fix commit c0a40097f0bc ("drivers:
core: synchronize really_probe() and dev_uevent()").

Commit 4a0079bc7aae ("nvdimm: Replace lockdep_mutex with local lock
classes") changed to assign nvdimm_namespace_key on dev->mutex instead of
__lockdep_no_validate__, which made lockdep to report this dependency.

On 2024/06/25 5:40, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    626737a5791b Merge tag 'pinctrl-v6.10-2' of git://git.kern..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=143a383e980000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=d6b9ee98d841760c
> dashboard link: https://syzkaller.appspot.com/bug?extid=4762dd74e32532cda5ff
> compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40