Overview
About vulnerability
In the Linux kernel, the following vulnerability has been resolved:
NFSv4/pNFS: Fix a race to wake on NFS_LAYOUT_DRAIN
We found a few different systems hung up in writeback waiting on the same page lock, and one task waiting on the NFS_LAYOUT_DRAIN bit in pnfs_update_layout(), however the pnfs_layout_hdr’s plh_outstanding count was zero.
It seems most likely that this is another race between the waiter and waker similar to commit ed0172af5d6f (“SUNRPC: Fix a race to wake a sync task”). Fix it up by applying the advised barrier.
Details
- Affected product:
- AlmaLinux 9.2 ESU , CentOS 8.4 ELS , CentOS 8.5 ELS , CentOS Stream 8 ELS , TuxCare 9.6 ESU
- Affected packages:
- kernel @ 4.18.0 (+4 more)
In the Linux kernel, the following vulnerability has been resolved:
NFSv4/pNFS: Fix a race to wake on NFS_LAYOUT_DRAIN
We found a few different systems hung up in writeback waiting on the same page lock, and one task waiting on the NFS_LAYOUT_DRAIN bit in pnfs_update_layout(), however the pnfs_layout_hdr’s plh_outstanding count was zero.
It seems most likely that this is another race between the waiter and waker similar to commit ed0172af5d6f (“SUNRPC: Fix a race to wake a sync task”). Fix it up by applying the advised barrier.