linux-kernel - Re: LTP rwtest01 blocks on DAX mountpoint

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Date:   Mon, 2 Jan 2017 18:16:17 +0100
From:   Jan Kara <jack@...e.cz>
To:     Xiong Zhou <xzhou@...hat.com>
Cc:     jack@...e.cz, linux-nvdimm@...1.01.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: LTP rwtest01 blocks on DAX mountpoint

On Fri 30-12-16 17:33:53, Xiong Zhou wrote:
> On Sat, Dec 24, 2016 at 07:07:14PM +0800, Xiong Zhou wrote:
> > Hi lists,
> > 
> > Since around 20161129 tag, LTP rwtest01 on dax mountpoint blocks
> > on linux-next tree, now on Linus tree.
> > 
> > In "normal", rwtest01 subcase ends in a few minutes, now it keeps
> > running for hours on dax mountpoint, both ext4 and xfs. Ctrl + c
> > can interrupt it.
> 
> Test programme is waiting for a memcpy call to return.
> 
> From sysrq output, kernel code is not blocking on somewhere,
> it just wont return.

I was trying to reproduce this but for me rwtest01 completes just fine on
dax mountpoint (I've used your reproducer). So can you sample several
kernel stack traces to get a rough idea where the kernel is running?
Thanks!

								Honza
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR