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From: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
To: Dmitry Vyukov <dvyukov@google.com>,
	syzbot <syzbot+bf89c128e05dd6c62523@syzkaller.appspotmail.com>
Cc: Jens Axboe <axboe@kernel.dk>,
	linux-block@vger.kernel.org, LKML <linux-kernel@vger.kernel.org>,
	syzkaller-bugs <syzkaller-bugs@googlegroups.com>,
	"Theodore Ts'o" <tytso@mit.edu>
Subject: Re: general protection fault in lo_ioctl (2)
Date: Tue, 8 May 2018 05:56:15 +0900	[thread overview]
Message-ID: <2030b2cf-29f9-7bfd-8266-b39abc19bdfe@I-love.SAKURA.ne.jp> (raw)
In-Reply-To: <CACT4Y+bTo34q4=7X8zGL_XVOGoYd7fqhfAbCAWUxsr-N96Kyxw@mail.gmail.com>

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

  reply	other threads:[~2018-05-07 20:56 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-02  7:33 syzbot
2018-05-02 11:23 ` Dmitry Vyukov
2018-05-07 20:56   ` Tetsuo Handa [this message]
2018-05-08 11:05     ` Tetsuo Handa
2018-05-08 12:37       ` Theodore Y. Ts'o
2018-05-08 21:06         ` Tetsuo Handa

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