Re: 100% disk usage reported by "df", 60% disk usage reported by "btrfs fi usage" - this breaks userspace behaviour

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On 2019-12-07 10:05, Chris Murphy wrote:
On Fri, Dec 6, 2019 at 5:47 PM Tomasz Chmielewski <mangoo@xxxxxxxx> wrote:

On 2019-12-06 12:54, Chris Murphy wrote:

> What version of coreutils?

This is Ubuntu 18.04 LTS, with coreutils 8.28.


> Maybe attach a strace of df? (I'm not sure of the list attach size
> limit but it's preferred, but something like a pastebin is OK also)

"Unfortunately" I did run a balance, which "recovered" the space for df.

Still an interesting data point.

Well, there is some crap there... it went read-only.

[164625.770369] BTRFS info (device nvme1n1): found 683 extents
[164630.127647] BTRFS info (device nvme1n1): relocating block group 345766887424 flags data
[164650.186985] BTRFS info (device nvme1n1): found 4268 extents
[164658.075685] BTRFS info (device nvme1n1): found 4266 extents
[164663.979192] BTRFS info (device nvme1n1): relocating block group 344693145600 flags data
[164686.646073] BTRFS info (device nvme1n1): found 3721 extents
[164696.815655] BTRFS: error (device nvme1n1) in btrfs_drop_snapshot:5402: errno=-4 unknown
[164696.821925] BTRFS info (device nvme1n1): forced readonly
[164696.834151] BTRFS warning (device nvme1n1): could not allocate space for delete; will truncate on mount [164696.834162] BTRFS info (device nvme1n1): balance: ended with status: -4
[164697.468475] BTRFS info (device nvme1n1): delayed_refs has NO entry


Tomasz Chmielewski
https://lxadm.com



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