On Tue, Jan 3, 2012 at 11:35 AM, Mitch Harder
[off-list ref] wrote:

I've recently run into a kernel "NULL pointer dereference" while
scrubbing a partition that had picked up error.

I'm no longer getting the NULL pointer panic on this partition.

I'm running into a new BUG_ON() now resulting from a EFBIG error in
btrfs_add_system_chunk(...) (in fs/btrfs/volumes.c).

I'm not sure if it is still interesting to pursue this issue.  If I
could reproduce the NULL Pointer panic, it might be worth tracking
down.  But as it stands now, btrfs is handling the corruption as best
as it knows how.