BTRFS warning: unhandled fiemap cache detected

Hi everyone :-)

After updating the kernel to the latest one 4.12 I receive a lot of warnings in my dmesg but only on my ssd that is a kingston hyperx predator.
No message get logged for my other two traditional HD that are btrfs also. Warnings show only on boot and not on every boot.
Kernel is now 4.12.5 but I got that till upgrading to 4.12, in 4.11 no warnings.

Just wanted to know if I have to worry about this, scrubs are ok and btrfs check give me no problems.

Thank you very much.
Mario.

Some sample:

[   13.486100] BTRFS warning (device sdd2): unhandled fiemap cache detected: offset=0 phys=1960767488 len=8192 flags=0x0
[   13.486110] BTRFS warning (device sdd2): unhandled fiemap cache detected: offset=0 phys=1960767488 len=8192 flags=0x0
[   13.486261] BTRFS warning (device sdd2): unhandled fiemap cache detected: offset=0 phys=1960824832 len=12288 flags=0x0
[   13.486280] BTRFS warning (device sdd2): unhandled fiemap cache detected: offset=0 phys=1960763392 len=4096 flags=0x0
[   13.486434] BTRFS warning (device sdd2): unhandled fiemap cache detected: offset=0 phys=1960767488 len=8192 flags=0x0
[   13.486446] BTRFS warning (device sdd2): unhandled fiemap cache detected: offset=0 phys=1960775680 len=4096 flags=0x0
[   13.486616] BTRFS warning (device sdd2): unhandled fiemap cache detected: offset=0 phys=1960783872 len=24576 flags=0x0
[   13.486650] BTRFS warning (device sdd2): unhandled fiemap cache detected: offset=0 phys=1960808448 len=4096 flags=0x0
[   13.486719] BTRFS warning (device sdd2): unhandled fiemap cache detected: offset=0 phys=1960812544 len=8192 flags=0x0
[   13.486742] BTRFS warning (device sdd2): unhandled fiemap cache detected: offset=0 phys=1960820736 len=4096 flags=0x0

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As much as I can tell it's nothing to worry about. (I have thousands of these warnings.) I don't know why the patch was submitted for 4.13 but not applied to the next 4.12.x , since it looks like a trivial tiny fix for an annoying problem.

Quoted 39 lines · Mario Fugazzi®

Hi everyone :-)

After updating the kernel to the latest one 4.12 I receive a lot of warnings in my dmesg but only on my ssd that is a kingston hyperx predator. No message get logged for my other two traditional HD that are btrfs also. Warnings show only on boot and not on every boot.
Kernel is now 4.12.5 but I got that till upgrading to 4.12, in 4.11 no warnings.

Just wanted to know if I have to worry about this, scrubs are ok and btrfs check give me no problems.

Thank you very much.
Mario.

Some sample:

[   13.486100] BTRFS warning (device sdd2): unhandled fiemap cache

detected: offset=0 phys=1960767488 len=8192 flags=0x0 [ 13.486110] BTRFS
warning (device sdd2): unhandled fiemap cache detected: offset=0
phys=1960767488 len=8192 flags=0x0 [ 13.486261] BTRFS warning (device
sdd2): unhandled fiemap cache detected: offset=0 phys=1960824832 len=12288
flags=0x0 [ 13.486280] BTRFS warning (device sdd2): unhandled fiemap
cache detected: offset=0 phys=1960763392 len=4096 flags=0x0 [ 13.486434]
BTRFS warning (device sdd2): unhandled fiemap cache detected: offset=0
phys=1960767488 len=8192 flags=0x0 [ 13.486446] BTRFS warning (device
sdd2): unhandled fiemap cache detected: offset=0 phys=1960775680 len=4096
flags=0x0 [ 13.486616] BTRFS warning (device sdd2): unhandled fiemap
cache detected: offset=0 phys=1960783872 len=24576 flags=0x0 [ 13.486650]
BTRFS warning (device sdd2): unhandled fiemap cache detected: offset=0
phys=1960808448 len=4096 flags=0x0 [ 13.486719] BTRFS warning (device
sdd2): unhandled fiemap cache detected: offset=0 phys=1960812544 len=8192
flags=0x0 [ 13.486742] BTRFS warning (device sdd2): unhandled fiemap
cache detected: offset=0 phys=1960820736 len=4096 flags=0x0

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