[[!comment format=mdwn
 username="t.z.mates"
 avatar="http://cdn.libravatar.org/avatar/90f15fad216078fd08d62cc676487925"
 subject="comment 9"
 date="2017-05-13T20:59:34Z"
 content="""
Thanks for the response! I've [linked](https://github.com/tzmates/GitAnnexStrace) to a repo where I posted the strace results (only for the offending line, otherwise there were a lot of files) as well as the code that generated it. I'm not very familiar with strace results, so let me know if I should supply anything else.

It certainly could be a BTRFS bug, though it doesn't seem to be tied to a specific kernel version; I've been continually updating kernels for the last 2 years now.

If it's any help, I've never had this sort of problem using `cp --reflink` day-to-day. I have no experience with `mmap` though, so that's a distinct possibility.

Thanks for all your input on this so far!
"""]]