From: Baokun Li <libaokun1@xxxxxxxxxx>
commit 3c58a9575e02c2b90a3180007d57105ceaa7c246 upstream.
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
==================================================================
Therefore use remove_proc_subtree() instead of remove_proc_entry() to
fix the above problem.
Fixes: 7eb5b3e3a0a5 ("netfs, fscache: Move /proc/fs/fscache to /proc/fs/netfs and put in a symlink")
Cc: stable@xxxxxxxxxx
Signed-off-by: Baokun Li <libaokun1@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20240826113404.3214786-1-libaokun@xxxxxxxxxxxxxxx
Acked-by: David Howells <dhowells@xxxxxxxxxx>
Signed-off-by: Christian Brauner <brauner@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/netfs/main.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/fs/netfs/main.c
+++ b/fs/netfs/main.c
@@ -138,7 +138,7 @@ static int __init netfs_init(void)
error_fscache:
error_procfile:
- remove_proc_entry("fs/netfs", NULL);
+ remove_proc_subtree("fs/netfs", NULL);
error_proc:
mempool_exit(&netfs_subrequest_pool);
error_subreqpool:
@@ -155,7 +155,7 @@ fs_initcall(netfs_init);
static void __exit netfs_exit(void)
{
fscache_exit();
- remove_proc_entry("fs/netfs", NULL);
+ remove_proc_subtree("fs/netfs", NULL);
mempool_exit(&netfs_subrequest_pool);
kmem_cache_destroy(netfs_subrequest_slab);
mempool_exit(&netfs_request_pool);
Patches currently in stable-queue which might be from libaokun1@xxxxxxxxxx are
queue-6.10/netfs-delete-subtree-of-fs-netfs-when-netfs-module-exits.patch
