linux-kernel - Re: WARNING at fs/nfs/write.c:743 nfs_inode_remove

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Message-Id: <FE0552AE-5243-44D3-B661-B622C2D957C0@primarydata.com>
Date:	Fri, 31 Oct 2014 10:49:13 -0400
From:	Weston Andros Adamson <dros@...marydata.com>
To:	Will Deacon <will.deacon@....com>
Cc:	Peng Tao <tao.peng@...marydata.com>,
	Trond Myklebust <trond.myklebust@...marydata.com>,
	linux-nfs list <linux-nfs@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: WARNING at fs/nfs/write.c:743 nfs_inode_remove_request with -rc6

On Oct 20, 2014, at 9:57 AM, Will Deacon <will.deacon@....com> wrote:

> On Sat, Oct 11, 2014 at 02:32:29PM +0100, Weston Andros Adamson wrote:
>> Hey Will,
> 
> Hi again, Andros,
> 
>> I’ve been very busy, but I haven’t forgotten about your bug report!
> 
> No problem, I've been busy too. I just checked with -rc1 and I can reproduce
> the issue there too.
> 
>> I think the WARN_ON_ONCE is just wrong, there are cases where the
>> PG_INODE_REF flag is legitimately not set. The flag is set so that sub
>> requests can mimmic the parent request’s reference count.
>> 
>> Could you please run the reproducer again, unmount, then check the contents of
>> /proc/fs/nfsfs/servers?
> 
> Sure. I just tried this and that file is empty after unmounting.

Sorry for the delay (again) - I just got back from a two week holiday.

This is good news! I think we can safely remove this WARN_ON_ONCE and call it a
day… or maybe calling it a month is more accurate ;)

-dros

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