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From:   Naresh Kamboju <naresh.kamboju@linaro.org>
Date:   Mon, 7 Dec 2020 16:07:44 +0530
Message-ID: <CA+G9fYvQaBVRjxwQ0=+09RCVi-sExv4LAAXpH3-TSGNL29EY7g@mail.gmail.com>
Subject: Re: WARNING: bad unlock balance detected! - mkfs.ext4/426 is trying
 to release lock (rcu_read_lock)
To:     Matthew Wilcox <willy@infradead.org>
Cc:     linux-stable <stable@vger.kernel.org>,
        open list <linux-kernel@vger.kernel.org>,
        linux-fsdevel@vger.kernel.org, rcu@vger.kernel.org,
        lkft-triage@lists.linaro.org,
        Alexander Viro <viro@zeniv.linux.org.uk>,
        "Paul E. McKenney" <paulmck@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Sasha Levin <sashal@kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Miquel Raynal <miquel.raynal@bootlin.com>,
        Mark Rutland <mark.rutland@arm.com>
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On Mon, 7 Dec 2020 at 11:37, Matthew Wilcox <willy@infradead.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