linux-kernel - Re: [process_vm_access] BUG: unable to handle kernel paging request at fffffff27b92dd20

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Message-ID: <20140210200436.GE18016@ZenIV.linux.org.uk>
Date:	Mon, 10 Feb 2014 20:04:36 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Fengguang Wu <fengguang.wu@...el.com>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [process_vm_access] BUG: unable to handle kernel paging request
 at fffffff27b92dd20

On Mon, Feb 10, 2014 at 07:22:31PM +0800, Fengguang Wu wrote:
> Hi Al,
> 
> We noticed the below oops since commit 68a25f08c9bec07ad95e55a01b127168e43aed84
> ("process_vm_access: take get_user_pages/put_pages one level up")
> while running ltp tests inside kvm.

Actually, that's a combination of 3 bugs, only one of them being in this
commit.  See current #iov_iter; AFAICS, all process_vm stuff in LTP passes
with it.

BTW, what's the story with ioctl3?  What I'm getting from it is
"Must supply a file collection or a command", with no further
explanations.  Something it wants installed that just isn't there?
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