[PATCH] netfs: Delete subtree of 'fs/netfs' when netfs module exits

[Christian Brauner]

On Mon, 26 Aug 2024 19:34:04 +0800, libaokun at huaweicloud.com wrote:
> In netfs_init() or fscache_proc_init(), we create dentry under 'fs/netfs',
> but in netfs_exit(), we only delete the proc entry of 'fs/netfs' without
> deleting its subtree. This triggers the following WARNING:
> 
> ==================================================================
> remove_proc_entry: removing non-empty directory 'fs/netfs', leaking at least 'requests'
> WARNING: CPU: 4 PID: 566 at fs/proc/generic.c:717 remove_proc_entry+0x160/0x1c0
> Modules linked in: netfs(-)
> CPU: 4 UID: 0 PID: 566 Comm: rmmod Not tainted 6.11.0-rc3 #860
> RIP: 0010:remove_proc_entry+0x160/0x1c0
> Call Trace:
>  <TASK>
>  netfs_exit+0x12/0x620 [netfs]
>  __do_sys_delete_module.isra.0+0x14c/0x2e0
>  do_syscall_64+0x4b/0x110
>  entry_SYSCALL_64_after_hwframe+0x76/0x7e
> ==================================================================
> 
> [...]

Applied to the vfs.misc branch of the vfs/vfs.git tree.
Patches in the vfs.misc branch should appear in linux-next soon.

Please report any outstanding bugs that were missed during review in a
new review to the original patch series allowing us to drop it.

It's encouraged to provide Acked-bys and Reviewed-bys even though the
patch has now been applied. If possible patch trailers will be updated.

Note that commit hashes shown below are subject to change due to rebase,
trailer updates or similar. If in doubt, please check the listed branch.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git
branch: vfs.misc

[1/1] netfs: Delete subtree of 'fs/netfs' when netfs module exits
      https://git.kernel.org/vfs/vfs/c/0aef59b3eabb