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

netfs: Delete subtree of 'fs/netfs' when netfs module exits

In netfsinit() or fscacheprocinit(), we create dentry under 'fs/netfs', but in netfsexit(), we only delete the proc entry of 'fs/netfs' without deleting its subtree. This triggers the following WARNING:

================================================================== removeprocentry: removing non-empty directory 'fs/netfs', leaking at least 'requests' WARNING: CPU: 4 PID: 566 at fs/proc/generic.c:717 removeprocentry+0x160/0x1c0 Modules linked in: netfs(-) CPU: 4 UID: 0 PID: 566 Comm: rmmod Not tainted 6.11.0-rc3 #860 RIP: 0010:removeprocentry+0x160/0x1c0 Call Trace: <TASK> netfsexit+0x12/0x620 [netfs] _dosysdeletemodule.isra.0+0x14c/0x2e0 dosyscall_64+0x4b/0x110

entrySYSCALL64afterhwframe+0x76/0x7e

Therefore use removeprocsubtree() instead of removeprocentry() to fix the above problem.