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+[[!comment format=mdwn
+ username="joey"
+ subject="""comment 8"""
+ date="2017-04-05T15:26:59Z"
+ content="""
+git-annex does use CoW in a few situations; it does so by running `cp
+--reflink` and letting it use CoW features when available. However,
+I don't see where `git annex add` would use that, and of course I don't see
+why that feature would break for you even if it did run cp that way.
+
+git also uses CoW, at least it uses `mmap` with `MAP_PRIVATE`. I'm not
+clear if/how that involves the filesystem layer.
+
+This remains puzzling, but knowing it's limited to btrfs on Arch Linux
+with CoW is certianly a good start.
+
+It seems like a bug in btrfs would not be out of the question.
+Trying some different kernel versions might be useful.
+
+It would perhaps be useful to get `strace -ff` logs.
+"""]]