When the group id of a shared mount is not allocated, the umount still tries to call mnt_release_group_id(), which eventually hits a kernel warning at ida_remove() spewing a message like: ida_remove called for id=0 which is not allocated.
This patch fixes the bug simply checking the group id in the caller. Reported-by: Cristian RodrÃguez <[email protected]> Signed-off-by: Takashi Iwai <[email protected]> --- fs/pnode.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/fs/pnode.c b/fs/pnode.c index 3d2a714..9af0df1 100644 --- a/fs/pnode.c +++ b/fs/pnode.c @@ -83,7 +83,8 @@ static int do_make_slave(struct mount *mnt) if (peer_mnt == mnt) peer_mnt = NULL; } - if (IS_MNT_SHARED(mnt) && list_empty(&mnt->mnt_share)) + if (mnt->mnt_group_id && IS_MNT_SHARED(mnt) && + list_empty(&mnt->mnt_share)) mnt_release_group_id(mnt); list_del_init(&mnt->mnt_share); -- 1.8.2.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
