In the Linux kernel, the following vulnerability has been resolved:

f2fs: fix to shrink read extent node in batches

We use rwlock to protect core structure data of extent tree during
its shrink, however, if there is a huge number of extent nodes in
extent tree, during shrink of extent tree, it may hold rwlock for
a very long time, which may trigger kernel hang issue.

This patch fixes to shrink read extent node in batches, so that,
critical region of the rwlock can be shrunk to avoid its extreme
long time hold.

https://git.kernel.org/stable/c/295b50e95e900da31ff237e46e04525fa799b2cf

https://git.kernel.org/stable/c/3fc5d5a182f6a1f8bd4dc775feb54c369dd2c343

https://git.kernel.org/stable/c/924f7dd1e832e4e4530d14711db223d2803f7b61