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.
References 4
https://git.kernel.org/stable/c/19b4d9ab5e77843eac0429c019470c02f8710b55
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/49d352bc263fe4a834233338bfaad31b3109addf
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/cce0be6eb4971456b703aaeafd571650d314bcca
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/a4810f8beb0122f032f10735f98d257aa6064f4c
416baaa9-dc9f-4396-8d5f-8c081fb06d67