This is a note to let you know that I've just added the patch titled
Btrfs: fix deadlock in run_delalloc_nocow
to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...
The filename of the patch is: btrfs-fix-deadlock-in-run_delalloc_nocow.patch and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.
From e89166990f11c3f21e1649d760dd35f9e410321c Mon Sep 17 00:00:00 2001
From: Liu Bo bo.li.liu@oracle.com Date: Thu, 25 Jan 2018 11:02:50 -0700 Subject: Btrfs: fix deadlock in run_delalloc_nocow
From: Liu Bo bo.li.liu@oracle.com
commit e89166990f11c3f21e1649d760dd35f9e410321c upstream.
@cur_offset is not set back to what it should be (@cow_start) if btrfs_next_leaf() returns something wrong, and the range [cow_start, cur_offset) remains locked forever.
cc: stable@vger.kernel.org Signed-off-by: Liu Bo bo.li.liu@oracle.com Reviewed-by: Josef Bacik jbacik@fb.com Signed-off-by: David Sterba dsterba@suse.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- fs/btrfs/inode.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
--- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -1320,8 +1320,11 @@ next_slot: leaf = path->nodes[0]; if (path->slots[0] >= btrfs_header_nritems(leaf)) { ret = btrfs_next_leaf(root, path); - if (ret < 0) + if (ret < 0) { + if (cow_start != (u64)-1) + cur_offset = cow_start; goto error; + } if (ret > 0) break; leaf = path->nodes[0];
Patches currently in stable-queue which might be from bo.li.liu@oracle.com are
queue-4.9/btrfs-fix-btrfs_evict_inode-to-handle-abnormal-inodes-correctly.patch queue-4.9/btrfs-fix-crash-due-to-not-cleaning-up-tree-log-block-s-dirty-bits.patch queue-4.9/btrfs-fix-extent-state-leak-from-tree-log.patch queue-4.9/btrfs-fix-unexpected-eexist-when-creating-new-inode.patch queue-4.9/btrfs-fix-deadlock-in-run_delalloc_nocow.patch