linux-kernel - Re: WARNING: bad unlock balance detected! - mkfs.ext4/426 is trying to release lock (rcu_read

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Message-ID: <CA+G9fYvQaBVRjxwQ0=+09RCVi-sExv4LAAXpH3-TSGNL29EY7g@mail.gmail.com>
Date:   Mon, 7 Dec 2020 16:07:44 +0530
From:   Naresh Kamboju <naresh.kamboju@...aro.org>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     linux-stable <stable@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        linux-fsdevel@...r.kernel.org, rcu@...r.kernel.org,
        lkft-triage@...ts.linaro.org,
        Alexander Viro <viro@...iv.linux.org.uk>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sasha Levin <sashal@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Mark Rutland <mark.rutland@....com>
Subject: Re: WARNING: bad unlock balance detected! - mkfs.ext4/426 is trying
 to release lock (rcu_read_lock)

On Mon, 7 Dec 2020 at 11:37, Matthew Wilcox <willy@...radead.org> wrote:
>
> On Mon, Dec 07, 2020 at 11:17:29AM +0530, Naresh Kamboju wrote:
> > While running "mkfs -t ext4" on arm64 juno-r2 device connected with SSD drive
> > the following kernel warning reported on stable rc 5.9.13-rc1 kernel.
> >
> > Steps to reproduce:
> > ------------------
> > # boot arm64 Juno-r2 device with stable-rc 5.9.13-rc1.
> > # Connect SSD drive
> > # Format the file system ext4 type
> >  mkfs -t ext4 <SSD-drive>
> > # you will notice this warning
>
> Does it happen easily?  Can you bisect?

I have been running multi test loops to reproduce this problem but no
luck yet :(
Since it is hard to reproduce we can not bisect.

- Naresh