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

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Message-ID: <20141020135736.GB20301@arm.com>
Date:	Mon, 20 Oct 2014 14:57:37 +0100
From:	Will Deacon <will.deacon@....com>
To:	Weston Andros Adamson <dros@...marydata.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 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.

Will
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