Scrub errors but no errors ?!?

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Hi,

Using kernel 3.19 on Ubuntu 15.04

I have a BTRFS Raid-1 FS made from 2 Luks-encrypted devices, each one built 
atop a bcache device.

The machine runs smoothly from this setup.

When I scrub said FS, it ends by spitting a message on console stating that 
"Scrub found errors but corrected them"

However if I then type :

# btrfs scrub stat /
scrub status for 53a35066-1a7b-4fe1-9f94-a923a7f9e3af
        scrub started at Sun Jun 28 11:17:50 2015 and finished after 30657 
seconds
        total bytes scrubbed: 3.01TiB with 0 errors

# btrfs dev stat /
[/dev/mapper/c_b].write_io_errs   0
[/dev/mapper/c_b].read_io_errs    0
[/dev/mapper/c_b].flush_io_errs   0
[/dev/mapper/c_b].corruption_errs 0
[/dev/mapper/c_b].generation_errs 0
[/dev/mapper/c_a].write_io_errs   0
[/dev/mapper/c_a].read_io_errs    0
[/dev/mapper/c_a].flush_io_errs   0
[/dev/mapper/c_a].corruption_errs 0
[/dev/mapper/c_a].generation_errs 0

...How comes ?

TIA for any insight.

-- 
Swâmi Petaramesh <swami@xxxxxxxxxxxxxx> http://petaramesh.org PGP 9076E32E

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