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Date: Wed, 2 Jul 2014 09:58:04 -0400
From: Chris Mason <clm@fb.com>
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To: Cody P Schafer <dev@codyps.com>
CC: Chris Samuel <chris@csamuel.org>, <linux-btrfs@vger.kernel.org>
Subject: Re: Blocked tasks on 3.15.1
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On 07/02/2014 08:27 AM, Cody P Schafer wrote:

>> Will do. The rsync I'm running is processing a lot of chromium cache
>> files when it hangs (just for a reference), and ends up triggering a
>> bunch of deletes as well.
> 
> Still a problem with your v3.15.y (eb97581), here's the log with
> sysrq-t and sysrq-l
> https://urldefense.proofpoint.com/v1/url?u=http://bpaste.net/show/428234/&k=ZVNjlDMF0FElm4dQtryO4A%3D%3D%0A&r=6%2FL0lzzDhu0Y1hL9xm%2BQyA%3D%3D%0A&m=9lRzEuxWeyHtsDXvFJNWlf2CgKZWZ1w%2FScqbUMy1jII%3D%0A&s=0daa1232bef652c4f16c9d12cdad408909feaa5069ba3c1888fa4895e01ec3a2
> 
> Also, correction, it's a firefox cache dir rsync that seems to trigger
> it (stalls pretty early on and very consistently):
> 
> [... snip ...]
> .cache/mozilla/firefox/kqtl1tlc.test/Cache/7/1F/F43F9d01
>           5.23M 100%   17.82MB/s    0:00:00 (xfr#452, ir-chk=1201/6659)
> .cache/mozilla/firefox/kqtl1tlc.test/Cache/7/20/
> .cache/mozilla/firefox/kqtl1tlc.test/Cache/7/20/23A66d01
>         116.82K 100%  376.50kB/s    0:00:00 (xfr#453, ir-chk=1200/6659)
> .cache/mozilla/firefox/kqtl1tlc.test/Cache/7/21/
> .cache/mozilla/firefox/kqtl1tlc.test/Cache/7/23/
> .cache/mozilla/firefox/kqtl1tlc.test/Cache/7/24/
> .cache/mozilla/firefox/kqtl1tlc.test/Cache/7/25/
> .cache/mozilla/firefox/kqtl1tlc.test/Cache/7/25/7C836d01
> [... stall here ...]
> 

Ok, and just to clarify, are you actively using the files on the
destination outside of rsync?

-chris