msk0: watchdog timeout in the HEAD

After updating kernel from 9-STABLE to 10-CURRENT (amd64) msk
interfaces stop working with "watchdog timout" error.  Watchdog arises
at a traffic 100-300+ Kb, for example:

make - C /usr/ports fetchindex

(on the fresh boot) reaches 11-15%  before watchdog coming

pciconf -vl | grep -A4 ^msk
mskc0_at_pci0:3:0:0:       class=0x020000 card=0x84391043 chip=0x438111ab
rev=0x11 hdr=0x00
    vendor     = 'Marvell Technology Group Ltd.'
    device     = 'Yukon Optima 88E8059 [PCIe Gigabit Ethernet
Controller with AVB]'
    class      = network
    subclass   = ethernet

msk(4)-related tunables doesn't change behavior.

svn://svn.freebsd.org/base/stable/9 works fine. What more can i give
for diagnostics?