Re: WARNING: at fs/btrfs/extent_io.c:4718 map_private_extent_buffer+0xd4/0xe0 [btrfs]()

[Josef Bacik <jbacik@fusionio.com>]

On Mon, Feb 25, 2013 at 12:21:30PM -0700, Mace Moneta wrote:
> On Mon, Feb 25, 2013 at 2:12 PM, Josef Bacik <jbacik@fusionio.com> wrote:
> 
> >
> > Is there any chance you got the line above [ cut here ]?  (I hate that stupid [
> > cut here ], it makes us miss all the usefull info.)  Thanks,
> >
> > Josef
> 
> There was really nothing significant above the 'cut here'.  Here it is
> with over an hour of earlier context:
>

Sigh, I don't know why this warn_on(1, printk) isn't doing it's job.  Here is a
debug patch, please capture the output from this so I can figure out what is
going on.  Thanks,

Josef

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 66f999b..eed5554 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -4715,9 +4715,10 @@ int map_private_extent_buffer(struct extent_buffer *eb, unsigned long start,
 	}
 
 	if (start + min_len > eb->len) {
-		WARN(1, KERN_ERR "btrfs bad mapping eb start %llu len %lu, "
+		printk(KERN_ERR "btrfs bad mapping eb start %llu len %lu, "
 		       "wanted %lu %lu\n", (unsigned long long)eb->start,
 		       eb->len, start, min_len);
+		WARN_ON(1);
 		return -EINVAL;
 	}