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From: Al Viro <viro@zeniv.linux.org.uk>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: syzbot <syzbot+3d2c27c2b7dc2a94814d@syzkaller.appspotmail.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Jiri Slaby <jirislaby@kernel.org>,
	linux-kernel@vger.kernel.org, snovitoll@gmail.com,
	syzkaller-bugs@googlegroups.com
Subject: Re: WARNING in iov_iter_revert (2)
Date: Sat, 20 Feb 2021 19:40:49 +0000	[thread overview]
Message-ID: <YDFlwf3AKbLiZhvh@zeniv-ca.linux.org.uk> (raw)
In-Reply-To: <YDFjNRv+DNL/Xh8W@zeniv-ca.linux.org.uk>

On Sat, Feb 20, 2021 at 07:29:57PM +0000, Al Viro wrote:

> And then you notice that it has reports
> successful write of amount other than what you'd passed and tries
> to pull back.

Sorry, half-edited sentence has escaped ;-/  Should be

"And there the caller notices that callback has reported a successful
write, but the amount apparently written is not the same as the
amount it had asked to write.  It interprets that as a short write
and tries to pull back.  Only it's actually _forward_, since we'd
asked to write 0 bytes and got a small positive number from the
callback."

  reply	other threads:[~2021-02-20 19:41 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-16 16:18 WARNING in iov_iter_revert (2) syzbot
2021-02-20 14:25 ` syzbot
     [not found]   ` <CAHk-=wiEBTD884i-U9DU7aDdRxXuz66Q1r-rKTiJUzZoYFgp+g@mail.gmail.com>
2021-02-20 17:38     ` Al Viro
2021-02-20 17:40       ` [git pull] work.namei stuff (v2) Al Viro
2021-02-21 17:43         ` Linus Torvalds
2021-02-21 18:39         ` pr-tracker-bot
2021-02-20 19:29       ` WARNING in iov_iter_revert (2) Al Viro
2021-02-20 19:40         ` Al Viro [this message]
2021-02-21  0:45         ` Linus Torvalds
2021-02-21  8:37           ` Sabyrzhan Tasbolatov
2021-02-21 17:20           ` Linus Torvalds

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