3.11.10.14 -stable review patch. If anyone has any objections, please let me know. ------------------ From: Wang Shilong <wangsl.fnst@xxxxxxxxxxxxxx> commit de348ee022175401e77d7662b7ca6e231a94e3fd upstream. In close_ctree(), after we have stopped all workers,there maybe still some read requests(for example readahead) to submit and this *maybe* trigger an oops that user reported before: kernel BUG at fs/btrfs/async-thread.c:619! By hacking codes, i can reproduce this problem with one cpu available. We fix this potential problem by invalidating all btree inode pages before stopping all workers. Thanks to Miao for pointing out this problem. Signed-off-by: Wang Shilong <wangsl.fnst@xxxxxxxxxxxxxx> Reviewed-by: David Sterba <dsterba@xxxxxxx> Signed-off-by: Chris Mason <clm@xxxxxx> Cc: David Sterba <dsterba@xxxxxxx> Signed-off-by: Luis Henriques <luis.henriques@xxxxxxxxxxxxx> --- fs/btrfs/disk-io.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index 3ce443662607..9001c263bc79 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -3554,6 +3554,11 @@ int close_ctree(struct btrfs_root *root) btrfs_free_block_groups(fs_info); + /* + * we must make sure there is not any read request to + * submit after we stopping all workers. + */ + invalidate_inode_pages2(fs_info->btree_inode->i_mapping); btrfs_stop_all_workers(fs_info); del_fs_roots(fs_info); -- 1.9.1 -- 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