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Date:   Sat, 30 Mar 2019 14:14:39 -0400
From:   "Theodore Ts'o" <tytso@....edu>
To:     liu.song11@....com.cn
Cc:     adilger@...ger.ca, jack@...e.cz, fishland@...yun.com,
        jack@...e.com, linux-ext4@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] jbd2: do not start commit when t_updates does not back
 tozero

On Sat, Mar 30, 2019 at 03:24:44PM +0800, liu.song11@....com.cn wrote:
> 
> When we unzipped bunch of files under ext4, sometimes got hungtask warning
> which indicate process was waiting on "j_wait_transaction_locked".

Can you give a clean repro of this?  What sort of storage device are
you using, and what sort of file systems and mount options are you
using?  I unzip files under ext4 all the time w/o any problems....

	  	      	    	     - Ted

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