Description

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

• git.kernel.org https://git.kernel.org/stable/c/19b4d9ab5e77843eac0429c019470c02f8710b55
• git.kernel.org https://git.kernel.org/stable/c/49d352bc263fe4a834233338bfaad31b3109addf
• git.kernel.org https://git.kernel.org/stable/c/a4810f8beb0122f032f10735f98d257aa6064f4c
• git.kernel.org https://git.kernel.org/stable/c/cce0be6eb4971456b703aaeafd571650d314bcca

Remediation