Looks like there's some sort of xattr and Btrfs interaction happening
here; but as it only happens with some subvolumes/snapshots not all
(but 100% consistent) maybe the kernel version at the time the
snapshot was taken is a factor? Anyway git bisect says
# first bad commit: [6c6ef9f26e598fb977f60935e109cd5b266c941a] xattr:
Stop calling {get,set,remove}xattr inode operations
btrfs-image produces a 159M file.
I've updated the bug report
https://bugzilla.kernel.org/show_bug.cgi?id=191761 and also adding
patch author to cc.
Chris Murphy
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