This is a note to let you know that I've just added the patch titled btrfs: fix slab cache flags for free space tree bitmap to the 5.11-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: btrfs-fix-slab-cache-flags-for-free-space-tree-bitmap.patch and it can be found in the queue-5.11 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 34e49994d0dcdb2d31d4d2908d04f4e9ce57e4d7 Mon Sep 17 00:00:00 2001 From: David Sterba <dsterba@xxxxxxxx> Date: Mon, 15 Mar 2021 15:18:24 +0100 Subject: btrfs: fix slab cache flags for free space tree bitmap From: David Sterba <dsterba@xxxxxxxx> commit 34e49994d0dcdb2d31d4d2908d04f4e9ce57e4d7 upstream. The free space tree bitmap slab cache is created with SLAB_RED_ZONE but that's a debugging flag and not always enabled. Also the other slabs are created with at least SLAB_MEM_SPREAD that we want as well to average the memory placement cost. Reported-by: Vlastimil Babka <vbabka@xxxxxxx> Fixes: 3acd48507dc4 ("btrfs: fix allocation of free space cache v1 bitmap pages") CC: stable@xxxxxxxxxxxxxxx # 5.4+ Signed-off-by: David Sterba <dsterba@xxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- fs/btrfs/inode.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -8806,7 +8806,7 @@ int __init btrfs_init_cachep(void) btrfs_free_space_bitmap_cachep = kmem_cache_create("btrfs_free_space_bitmap", PAGE_SIZE, PAGE_SIZE, - SLAB_RED_ZONE, NULL); + SLAB_MEM_SPREAD, NULL); if (!btrfs_free_space_bitmap_cachep) goto fail; Patches currently in stable-queue which might be from dsterba@xxxxxxxx are queue-5.11/btrfs-fix-slab-cache-flags-for-free-space-tree-bitmap.patch queue-5.11/btrfs-fix-race-when-cloning-extent-buffer-during-rewind-of-an-old-root.patch