At 03/17/2017 07:22 AM, Chris Murphy wrote:
With kernel 4.10.3, and btrfs-progs 4.10, I'm still seeing the
following errors only with --mode=lowmem with a single device volume.


ERROR: data extent[16913485824 7577600] backref lost
(hundreds of lines of the same thing)

btrfs-image (no errors reported during capture) 518MiB
https://drive.google.com/open?id=0B7NttHfq6wAJd3ZXM3AxS0dVQlU

Thanks a lot for the image.

Turns out to be that, lowmem mode only checks EXTENT_DATA_REF key, and doesn't check SHARED_DATA_REF_KEY, this leads to the error message.

Fix will be sent out soon.

Thanks,
Qu


Chris Murphy




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