I could reproduce it with Ubuntu's mainline kernel 6.11.11 on 24.04.
For the higher kernel version there was some compilation error, so I couldn't 
check it.

There's a number of related bugs, and its not always clear how to even 
distinguish between them:
https://bugzilla.kernel.org/show_bug.cgi?id=74101#c12
https://bugzilla.kernel.org/show_bug.cgi?id=74101#c6
https://bugzilla.kernel.org/show_bug.cgi?id=74101#c5
https://bugs.launchpad.net/ubuntu/+source/btrfs-tools/+bug/1664013
https://github.com/kdave/btrfs-progs/issues/657
https://github.com/kdave/btrfs-progs/issues/936

> What I need to understand is if there's an issue in the kernel which
need a patch

Kernel code is involved in this bug for sure, but this doesn't seem to be a 
simple yes/no type of issue that is easy to answer. I believe every 
btrfs-relevant commit could improve kernel's allocation algorithm behavior.
One must format the whole partition and start from scratch to even try to 
reproduce it.

Why not simply merge every btrfs-relevant kernel's commit?
Until both kernel btrfs and userspace version are up to date, I don't know how 
one could even attempt to answer this question.

At least some of the issues listed above should be fixed if both btrfs-related 
kernel's commits and userspace version are up to date.
I don't know  about specific kernel commits sorry. 
BTRFS team at https://github.com/kdave/btrfs-progs should be able to advise on 
this.

Hope this helps.

** Bug watch added: Linux Kernel Bug Tracker #74101
   https://bugzilla.kernel.org/show_bug.cgi?id=74101

** Bug watch added: github.com/kdave/btrfs-progs/issues #657
   https://github.com/kdave/btrfs-progs/issues/657

** Bug watch added: github.com/kdave/btrfs-progs/issues #936
   https://github.com/kdave/btrfs-progs/issues/936

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https://bugs.launchpad.net/bugs/2091894

Title:
  btrfs receive allocates ALL space for DATA & makes it UNUSABLE
  (24.04.1)

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