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Re: LTP rwtest01 blocks on DAX mountpoint

From Jan Kara <jack@suse.cz>
Newsgroups linux.kernel
Subject Re: LTP rwtest01 blocks on DAX mountpoint
Date 2017-01-02 18:20 +0100
Message-ID <sVer7-1K6-15@gated-at.bofh.it> (permalink)
References <sRSn7-67J-5@gated-at.bofh.it> <sU1Pj-2xO-1@gated-at.bofh.it>
Organization linux.* mail to news gateway

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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@suse.com>
SUSE Labs, CR

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Thread

LTP rwtest01 blocks on DAX mountpoint Xiong Zhou <xzhou@redhat.com> - 2016-12-24 12:10 +0100
  Re: LTP rwtest01 blocks on DAX mountpoint Xiong Zhou <xzhou@redhat.com> - 2016-12-30 10:40 +0100
    Re: LTP rwtest01 blocks on DAX mountpoint Jan Kara <jack@suse.cz> - 2017-01-02 11:20 +0100
    Re: LTP rwtest01 blocks on DAX mountpoint Jan Kara <jack@suse.cz> - 2017-01-02 18:20 +0100
      Re: LTP rwtest01 blocks on DAX mountpoint Ross Zwisler <ross.zwisler@linux.intel.com> - 2017-01-03 05:00 +0100
        Re: LTP rwtest01 blocks on DAX mountpoint Xiong Zhou <xzhou@redhat.com> - 2017-01-03 07:50 +0100
          Re: LTP rwtest01 blocks on DAX mountpoint Ross Zwisler <ross.zwisler@linux.intel.com> - 2017-01-03 18:00 +0100

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