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From: Mark Zealey <mark@markandruth.co.uk>
To: linux-btrfs@vger.kernel.org
Subject: Filesystem hang on kernel 4.2.0 with copy reflink
Date: Mon, 4 Jan 2016 10:35:43 +0200	[thread overview]
Message-ID: <568A2EDF.6090909@markandruth.co.uk> (raw)

Hi there, I've run into a very strange hang with btrfs. I was trying to 
restore a directory (postgres database) from a readonly snapshot. To do 
this i used the command `cp -ar --reflink=always`. This worked fine for 
100s of files, however when it got to a particular file 16 kworker 
threads (I have 8 processors in this system) got marked as being in D 
state (with 0 cpu usage or disk usage) and I could not access the btrfs 
file system any more. I can't see any kernel message or OOPS. Can you 
please let me know what additional debug information I can provide to 
help track this issue down in the kernel?

System is latest ubuntu 14.04 LTS with a backported wily kernel (package 
linux-image-4.2.0-22-generic):

4.2.0-22-generic #27~14.04.1-Ubuntu SMP Fri Dec 18 10:57:53 UTC 2015 
x86_64 x86_64 x86_64 GNU/Linux

Thanks

Mark

             reply	other threads:[~2016-01-04  8:52 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-01-04  8:35 Mark Zealey [this message]
2016-01-04 10:41 ` Filesystem hang on kernel 4.2.0 with copy reflink Jack Wang
2016-01-04 12:11   ` Mark Zealey
2016-01-09  9:28     ` Duncan

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