Re: WARNING: CPU: 3 PID: 439 at fs/btrfs/ctree.h:1559 btrfs_update_device+0x1c5/0x1d0 [btrfs]

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On 9/19/2017 10:39 PM, Qu Wenruo wrote:

In v4.13 kernel, the newly added devices are in fact rounded down.
But existing device doesn't get the round down.

So it's recommended to resize (shrink) your fs for very small size to fix it if you don't want to wait for the kernel fix.


What's the most direct way to do that?  (Was about to risk breaking the mirror and repartitioning!  I'd rather not!)

Hmm -- maybe this worked:

$ sudo btrfs filesystem resize -1m /.MEDIA/
Resize '/.MEDIA/' of '-1m'

Thanks,
Qu

So I'm wondering if it's caused by added new btrfs device.


Possibly... I've added and removed disks to some of the btrfs fs's.
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