linux-kernel - Re: INFO: rcu detected stall in blkdev

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Message-ID: <18608105-31d3-3d77-ccbb-a25bbe7e55e6@I-love.SAKURA.ne.jp>
Date:   Sat, 28 Apr 2018 17:57:35 +0900
From:   Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:     syzbot 
        <syzbot+369c35474963daf8f8eea897ecf33cb6ad6c7ea2@...kaller.appspotmail.com>,
        axboe@...nel.dk, linux-block@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Cc:     akpm@...ux-foundation.org, gregkh@...uxfoundation.org,
        hpa@...or.com, kstewart@...uxfoundation.org,
        linux-kernel@...r.kernel.org, mingo@...hat.com, npiggin@...il.com,
        pombredanne@...b.com, tglx@...utronix.de, x86@...nel.org
Subject: Re: INFO: rcu detected stall in blkdev_ioctl

Like I noted in a patch at

https://groups.google.com/d/msg/syzkaller-bugs/2Rw8-OM6IbM/PzdobV8kAgAJ

loop module is not thread safe. Can we use more global lock?