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Change History

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

NFS: Fix a deadlock involving nfs_release_folio()

Wang Zhaolong reports a deadlock involving NFSv4.1 state recovery
waiting on kthreadd, which is attempting to reclaim memory by calling
nfs_release_folio(). The latter cannot make progress due to state
recovery being needed.

It seems that the only safe thing to do here is to kick off a writeback
of the folio, without waiting for completion, or else kicking off an
asynchronous commit.

https://git.kernel.org/stable/c/19b4d9ab5e77843eac0429c019470c02f8710b55

https://git.kernel.org/stable/c/49d352bc263fe4a834233338bfaad31b3109addf

https://git.kernel.org/stable/c/cce0be6eb4971456b703aaeafd571650d314bcca