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
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