ERROR: failed to clone extents to ,,,

[jlittle]

After release upgrading to 24.10, my incremental send/receives are often failing with, for example,

ERROR: failed to clone extents to etc/samba/smb.conf: Invalid argument

Searching, I found this from a btrfs list:

https://www.spinics.net/lists/linux-...msg149482.html

and this points to a fix being submitted:

https://lore.kernel.org/linux-btrfs/5a406a607fcccec01684056ab011ff0742f06439.172743256 6.git.fdmanana@suse.com/

I tried to follow the thread where it discussed kernel version numbers, but I couldn't understand. uname -a says my kernel is 6.11.0-9-generic, but the threads talk about 6.1.115 having the problem fixed; I'd have thought that 6.11.0 would come after 6.1.x.

Can anyone explain about whether my 24.10 kernel has the fix?

[oshunluvr]

https://en.wikipedia.org/wiki/Linux_...ersion_history

6.11. is after 6.1.

[oshunluvr]

Look slike a regression, or not actually fixed:

https://www.spinics.net/lists/linux-...msg149458.html

[jlittle]

An update...

As the problem is in the software, and the data are not affected, I've been able to boot to a noble (24.04) install to do incremental backups.

Over the last day or so, I've made a vanilla install of 24.10, updated, reproduced the problem, then installed the latest kernel on https://kernel.ubuntu.com/mainline/, 6.12.3:

1. download the 4 debs in mainline/v6.12.3/amd64
2. run sudo dpkg -i *.deb
3. reboot

I also cloned https://github.com/kdave/btrfs-progs and built the latest version, v6.12 (24.10 has v6.6.3):

1. git clone https://github.com/kdave/btrfs-progs.git
2. enabled source repos in /etc/sources.list.d/ubuntu-sources by adding "deb-src" to the "Types:" lines, so that the read Types: deb deb-src
3. sudo apt build-dep btrfs-progs
4. cd btrfs-progs
5. followed the instructions in the INSTALL file, that is
   1. ./autgen.sh
   2. ./configure
   3. make
   4. sudo make install

then the error did not occur.

I'm not sure the new version of btrfs-progs is necessary. When (and if) I apply the fix to my main install, I'll do the kernel only and test.