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https://bugs.launchpad.net/bugs/1925284
Title:
Btrfs: Disk replacement causes massive allocation of empty single
chunks while degraded
Status in linux package in Ubuntu:
Incomplete
Bug description:
I experience this with Ubuntu 21.04. I've not tested on older
releases. I have a btrfs RAID1 array and simulated a failed disk and
then replaced it with the `btrfs replace` feature part of btrfs-progs
after mounting the remaining disk with the degraded,noatime mount
options.
For clarity: The disk that is being used in btrfs replace is sda1,
sdb1 is the existing disk with the data that is mounted degraded.
Unfortunately, when you begin the replacement, btrfs begins slowly
allocating new empty single chunks on the disk that was mounted
degraded (sdb1) as soon as the btrfs replace begins, seemingly equal
to the amount of raid1 chunks that were already allocated + 1. As the
replace continues, this value increases:
Data,single: Size:107.00GiB, Used:5.25MiB (0.00%)
/dev/sdb1 107.00GiB
... several minutes later as btrfs replace continues to run ...
Data,single: Size:177.00GiB, Used:5.25MiB (0.00%)
/dev/sdb1 177.00GiB
I have also posted this on the Btrfs kernel mailing list here for more
details and output from commands: https://lore.kernel.org/linux-
btrfs/cafmvigfq+xotjo_578lvsvycd3sblcv_ap6a+b0u+ybapu2...@mail.gmail.com/T/#t
It's speculated this could be an Ubuntu specific issue. What is
certain is I've done this process three times with this array on
Ubuntu 21.04 and it happens every time, so I can reproduce it 100%. I
believe this is a bug with the Ubuntu kernel, but I suppose it could
be related to btrfs-progs. What is certain is the btrfs replace
triggers the issue.
I'm happy to provide any more additional details as best I can. Thanks,
-Jonah
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