On Tue, Nov 11, 2014 at 3:10 PM, Julien Muchembled <jm@xxxxxxxxxxx>
wrote:
Hello,
I upgraded my kernel from 3.15.10 to 3.17.2 and after a while, btrfs
kworkers started to read/write data at maximum speed for hours
whereas I was doing nothing. So I rebooted with kernel 3.15.10 and
hopefully everything went back to normal. Later attempts to upgrade
to 3.16.7 or 3.17.2 showed the same issue, immediately at boot or
after a while.
In order to investigate a little, I copied the partition and mounted
it in qemu (snapshot mode, with cow file in tmpfs, debian kernel
3.16.7-2). I could see that btrfs always wrote the same ~8MB in loop.
qemu used all cpu and when I stopped it, it wrote 190G and the
generation number raised from 625955 to 853922.
I dumped the FS with btrfs-image. The restored FS has the same issue
so I can send the image (78M) to anyone who would like to debug.
Which mount options are you using? This sounds like something in
autodefrag...
-chris
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