Comment # 4 on bug 944188 from Darren Freeman

It's happening continuously - that's how it generates such large files.

Let me give you an example. Here are the four "cut here" lines from four
consecutive entries. You can see they are not far apart in time.

2015-09-01T14:19:47.311285+10:00 buffy kernel: [285775.442890] ------------[
cut here ]------------

2015-09-01T14:19:47.311339+10:00 buffy kernel: [285775.443045] ------------[
cut here ]------------

2015-09-01T14:19:47.316203+10:00 buffy kernel: [285775.447492] ------------[
cut here ]------------

2015-09-01T14:19:47.316256+10:00 buffy kernel: [285775.447641] ------------[
cut here ]------------

I believe this is probably happening during either an image read or write
operation.

Command line:

dd if=/dev/mmcblk0 of=some.file ibs=1M obs=1M &

And swap if for of if I'm writing.