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