kmemleak reports a leak after every mount-umount cycle:
unreferenced object 0xffff88006b339150 (size 8):
comm "mount.nfs", pid 752, jiffies 4294802777 (age 1515.620s)
hex dump (first 8 bytes):
00 00 00 00 00 00 00 00 ........
backtrace:
[<ffffffff816a9509>] kmemleak_alloc+0x79/0xb0
[<ffffffff811a9031>] __kmalloc+0x1e1/0x380
[<ffffffff81164110>] register_shrinker+0x40/0x90
[<ffffffff811c8f10>] sget+0x680/0x6a0
[<ffffffffa026a71c>] nfs_fs_mount_common+0x7c/0x180 [nfs]
[<ffffffffa026a8e1>] nfs_xdev_mount+0xc1/0x100 [nfs]
[<ffffffff811c9c1b>] mount_fs+0x7b/0x1a0
[<ffffffff811e7b0a>] vfs_kern_mount+0x6a/0xf0
[<ffffffffa0275735>] nfs_do_submount+0xe5/0x140 [nfs]
[<ffffffffa02db6a6>] nfs4_submount+0x806/0x890 [nfsv4]
[<ffffffffa02758d2>] nfs_d_automount+0xb2/0x1b0 [nfs]
[<ffffffff811d0154>] follow_managed+0x1a4/0x300
[<ffffffff816b0533>] lookup_slow+0x7a/0xa9
[<ffffffff811d2373>] link_path_walk+0x243/0x8b0
[<ffffffff811d2a3b>] path_lookupat+0x5b/0x7c0
[<ffffffff811d31cb>] filename_lookup+0x2b/0xc0
Commit 1d3d4437 adds logic to kmalloc an array (nr_deferred) in
register_shrinker(), but this array is not freed when the shrinker
is released.
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
---
mm/vmscan.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 53f2f82..eea668d 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -211,6 +211,7 @@ void unregister_shrinker(struct shrinker *shrinker)
down_write(&shrinker_rwsem);
list_del(&shrinker->list);
up_write(&shrinker_rwsem);
+ kfree(shrinker->nr_deferred);
}
EXPORT_SYMBOL(unregister_shrinker);
--
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