Bug#624343: Status?

[Jim Paris <jim@jtan.com>]

I hit this yesterday too, on kernel 3.14-2-amd64 (3.14.15-2).  With
RAID1 + LVM + ext4, I added a USB disk to the RAID1 and started to get
immediate errors while mysql wrote to disk:

  [14648432.847614] bio too big device md1 (1024 > 240)
  [14648432.848791] EXT4-fs warning: 2 callbacks suppressed
  [14648432.848796] EXT4-fs warning (device dm-0): ext4_end_bio:317: I/O error -5 writing to inode 7684151 (offset 0 size 0 starting block 30760663)

Yikes!  It seems that this bug was tracked at:
  https://bugzilla.kernel.org/show_bug.cgi?id=9401

which was marked as "fixed" back in 2013.  But the comments suggest
that Kent Overstreet's immutable biovec patchset was the solution,
which appears to have been already included in 3.14.  Does anyone have
any insight into whether this bug is supposed to have been fixed?

Jim