This is a note to let you know that I've just added the patch titled xfs: xfs_iflush_cluster fails to abort on error to the 4.6-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: xfs-xfs_iflush_cluster-fails-to-abort-on-error.patch and it can be found in the queue-4.6 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From b1438f477934f5a4d5a44df26f3079a7575d5946 Mon Sep 17 00:00:00 2001 From: Dave Chinner <dchinner@xxxxxxxxxx> Date: Wed, 18 May 2016 13:53:42 +1000 Subject: xfs: xfs_iflush_cluster fails to abort on error From: Dave Chinner <dchinner@xxxxxxxxxx> commit b1438f477934f5a4d5a44df26f3079a7575d5946 upstream. When a failure due to an inode buffer occurs, the error handling fails to abort the inode writeback correctly. This can result in the inode being reclaimed whilst still in the AIL, leading to use-after-free situations as well as filesystems that cannot be unmounted as the inode log items left in the AIL never get removed. Fix this by ensuring fatal errors from xfs_imap_to_bp() result in the inode flush being aborted correctly. Reported-by: Shyam Kaushik <shyam@xxxxxxxxxxxxxxxxx> Diagnosed-by: Shyam Kaushik <shyam@xxxxxxxxxxxxxxxxx> Tested-by: Shyam Kaushik <shyam@xxxxxxxxxxxxxxxxx> Signed-off-by: Dave Chinner <dchinner@xxxxxxxxxx> Reviewed-by: Christoph Hellwig <hch@xxxxxx> Signed-off-by: Dave Chinner <david@xxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- fs/xfs/xfs_inode.c | 17 +++++++++++++---- 1 file changed, 13 insertions(+), 4 deletions(-) --- a/fs/xfs/xfs_inode.c +++ b/fs/xfs/xfs_inode.c @@ -3327,7 +3327,7 @@ xfs_iflush( struct xfs_buf **bpp) { struct xfs_mount *mp = ip->i_mount; - struct xfs_buf *bp; + struct xfs_buf *bp = NULL; struct xfs_dinode *dip; int error; @@ -3369,14 +3369,22 @@ xfs_iflush( } /* - * Get the buffer containing the on-disk inode. + * Get the buffer containing the on-disk inode. We are doing a try-lock + * operation here, so we may get an EAGAIN error. In that case, we + * simply want to return with the inode still dirty. + * + * If we get any other error, we effectively have a corruption situation + * and we cannot flush the inode, so we treat it the same as failing + * xfs_iflush_int(). */ error = xfs_imap_to_bp(mp, NULL, &ip->i_imap, &dip, &bp, XBF_TRYLOCK, 0); - if (error || !bp) { + if (error == -EAGAIN) { xfs_ifunlock(ip); return error; } + if (error) + goto corrupt_out; /* * First flush out the inode that xfs_iflush was called with. @@ -3404,7 +3412,8 @@ xfs_iflush( return 0; corrupt_out: - xfs_buf_relse(bp); + if (bp) + xfs_buf_relse(bp); xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE); cluster_corrupt_out: error = -EFSCORRUPTED; Patches currently in stable-queue which might be from dchinner@xxxxxxxxxx are queue-4.6/xfs-xfs_iflush_cluster-fails-to-abort-on-error.patch queue-4.6/xfs-disallow-rw-remount-on-fs-with-unknown-ro-compat-features.patch queue-4.6/xfs-fix-inode-validity-check-in-xfs_iflush_cluster.patch queue-4.6/xfs-skip-stale-inodes-in-xfs_iflush_cluster.patch queue-4.6/xfs-remove-xfs_fs_evict_inode.patch queue-4.6/xfs-don-t-wrap-growfs-agfl-indexes.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html