linux-kernel - Re: general protection fault in lo

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Message-ID: <2030b2cf-29f9-7bfd-8266-b39abc19bdfe@I-love.SAKURA.ne.jp>
Date:   Tue, 8 May 2018 05:56:15 +0900
From:   Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:     Dmitry Vyukov <dvyukov@...gle.com>,
        syzbot <syzbot+bf89c128e05dd6c62523@...kaller.appspotmail.com>
Cc:     Jens Axboe <axboe@...nel.dk>, linux-block@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        "Theodore Ts'o" <tytso@....edu>
Subject: Re: general protection fault in lo_ioctl (2)

On 2018/05/02 20:23, Dmitry Vyukov wrote:
> #syz dup: INFO: rcu detected stall in blkdev_ioctl

The cause of stall turned out to be ioctl(loop_fd, LOOP_CHANGE_FD, loop_fd).

But we haven't explained the cause of NULL pointer dereference which can
occur when raced with ioctl(LOOP_CLR_FD). Therefore,

#syz undup