balance stuck in loop on linux 6.1.7

[Ian Kelling <iank@fsf.org>]

Jan 19 11:48:50 frodo kernel: BTRFS info (device dm-13): balance: start -dconvert=raid1c3 -mconvert=raid1c3 -sconvert=raid1c3
...
Jan 22 05:03:23 frodo kernel: BTRFS info (device dm-13): relocating block group 80026774405120 flags data|raid1c3
Jan 22 05:03:48 frodo kernel: BTRFS info (device dm-13): found 41 extents, stage: move data extents
Jan 22 05:03:57 frodo kernel: BTRFS info (device dm-13): found 41 extents, stage: update data pointers
Jan 22 05:04:06 frodo kernel: BTRFS info (device dm-13): relocating block group 80025700663296 flags data|raid1c3
Jan 22 05:04:29 frodo kernel: BTRFS info (device dm-13): found 71 extents, stage: move data extents
Jan 22 05:04:48 frodo kernel: BTRFS info (device dm-13): found 71 extents, stage: update data pointers
Jan 22 05:05:10 frodo kernel: BTRFS info (device dm-13): relocating block group 42827839111168 flags data|raid10
Jan 22 05:05:24 frodo kernel: BTRFS info (device dm-13): found 1 extents, stage: move data extents
Jan 22 05:05:42 frodo kernel: BTRFS info (device dm-13): found 1 extents, stage: update data pointers
Jan 22 05:05:55 frodo kernel: BTRFS info (device dm-13): found 1 extents, stage: update data pointers
Jan 22 05:06:08 frodo kernel: BTRFS info (device dm-13): found 1 extents, stage: update data pointers
Jan 22 05:06:21 frodo kernel: BTRFS info (device dm-13): found 1 extents, stage: update data pointers
Jan 22 05:06:29 frodo kernel: BTRFS info (device dm-13): found 1 extents, stage: update data pointers
...
Jan 24 19:48:19 frodo kernel: BTRFS info (device dm-13): found 1 extents, stage: update data pointers
Jan 24 19:48:35 frodo kernel: BTRFS info (device dm-13): found 1 extents, stage: update data pointers

Since the ..., all the lines have been repeats.

# btrfs balance status /mnt/i
Balance on '/mnt/i' is running
6650 out of about 7480 chunks balanced (6651 considered),  11% left

It has been stuck at 11% for the last 2 days and I assume since the loop
started.

I first experienced this on an earlier kernel so I canceled it and
upgraded to the latest but it is still getting stuck.

# cat /proc/version
Linux version 6.1.7-gnu (rms@mit-oz) (x86_64-linux-gcc (GCC) 12.2.0, GNU ld (GNU Binutils) 2.40) #1.0 SMP PREEMPT_DYNAMIC Tue Sep 27 12:35:59 EST 1983

# btrfs --version
btrfs-progs v6.1.2

If this is a bug, I would like to help the btrfs developers solve it. I
can run whatever commands needed to get more information and try out
patches. But I cannot provide a copy of the filesystem because it has
personal data.

If I restart the balance, it will take about 2.8 days to get back to the
stuck 11% point. The balance is still running, but I'm going to cancel
it morning unless I hear from the list that there is some use to letting
it run since it is wearing out the mechanical drives.

-- 
Ian Kelling | Senior Systems Administrator, Free Software Foundation
GPG Key: B125 F60B 7B28 7FF6 A2B7  DF8F 170A F0E2 9542 95DF
https://fsf.org | https://gnu.org