Hi guys,
I don’t know if this is related to the issue in the thread or not. I found your thread on Google.
I have a laptop with a BTRFS root filesystem (300gb) and snapshots managed by snapper (currently about 30 snapshots). This setup has been working without issues for about 5 years.
I periodically back up this filesystem to an external NVMe drive. Today, I started this backup as usual and was very surprised to see a freeze with kswapd and btrfs-cleaner.
I haven’t had much time to debug this yet, but I discovered it’s not related to the NVMe drive because it happens even when I use btrfs send to /dev/null.
I tried changing the kernel to the LTS version (6.6) and the issue disappeared.
So, could you please check if you can reproduce this issue on previous kernel versions? It looks like something is broken in 6.10
UPD:
I suspect that this kernel regression might be related: