BSD 5.3 crashes, "ath0: [GIANT-LOCKED]"

[Marcos Biscaysaqu - ThePacific.net]

Hi there

Im upgrade more than 50 boxes BSD5.2.1 to BSD5.3, and I started to have 
a lot of crashes, Im runing BSD from RAM.  all the boxes been working 
perfect in 5.2.1 but now Im having a lot of problems.

Im have repited dmesgs of my networks card with [GIANT-LOCKED] option and :
"WARNING: debug.mpsafenet forced to 0 as ipsec requires Giant"
"WARNING: MPSAFE network stack disabled, expect reduced performance"

please let me know if you need more info.

dmesg:
 [root at 5898:~]# "dmesg |grep ath0"

ath0: turbo rates: 6Mbps 9Mbps 12Mbps 18Mbps 24Mbps 36Mbps 48Mbps 54Mbps
ath0: <Atheros 5211> mem 0x42000000-0x4200ffff irq 11 at device 14.0 on pci0
ath0: [GIANT-LOCKED]
ath0: mac 4.2 phy 3.0 5ghz radio 1.7 2ghz radio 2.3
ath0: Ethernet address: 00:01:24:70:54:a9
ath0: 11a rates: 6Mbps 9Mbps 12Mbps 18Mbps 24Mbps 36Mbps 48Mbps 54Mbps
ath0: 11b rates: 1Mbps 2Mbps 5.5Mbps 11Mbps
ath0: turbo rates: 6Mbps 9Mbps 12Mbps 18Mbps 24Mbps 36Mbps 48Mbps 54Mbps
ath0: <Atheros 5211> mem 0x42000000-0x4200ffff irq 11 at device 14.0 on pci0
ath0: [GIANT-LOCKED]
ath0: mac 4.2 phy 3.0 5ghz radio 1.7 2ghz radio 2.3
ath0: Ethernet address: 00:01:24:70:54:a9
ath0: 11a rates: 6Mbps 9Mbps 12Mbps 18Mbps 24Mbps 36Mbps 48Mbps 54Mbps
ath0: 11b rates: 1Mbps 2Mbps 5.5Mbps 11Mbps
ath0: turbo rates: 6Mbps 9Mbps 12Mbps 18Mbps 24Mbps 36Mbps 48Mbps 54Mbps
ath0: <Atheros 5211> mem 0x42000000-0x4200ffff irq 11 at device 14.0 on pci0
ath0: [GIANT-LOCKED]
ath0: mac 4.2 phy 3.0 5ghz radio 1.7 2ghz radio 2.3
ath0: Ethernet address: 00:01:24:70:54:a9
ath0: 11a rates: 6Mbps 9Mbps 12Mbps 18Mbps 24Mbps 36Mbps 48Mbps 54Mbps
ath0: 11b rates: 1Mbps 2Mbps 5.5Mbps 11Mbps
ath0: turbo rates: 6Mbps 9Mbps 12Mbps 18Mbps 24Mbps 36Mbps 48Mbps 54Mbps
ath0: <Atheros 5211> mem 0x42000000-0x4200ffff irq 11 at device 14.0 on pci0
ath0: [GIANT-LOCKED]
ath0: mac 4.2 phy 3.0 5ghz radio 1.7 2ghz radio 2.3
ath0: Ethernet address: 00:01:24:70:54:a9
ath0: 11a rates: 6Mbps 9Mbps 12Mbps 18Mbps 24Mbps 36Mbps 48Mbps 54Mbps
ath0: 11b rates: 1Mbps 2Mbps 5.5Mbps 11Mbps
ath0: turbo rates: 6Mbps 9Mbps 12Mbps 18Mbps 24Mbps 36Mbps 48Mbps 54Mbps
ath0: <Atheros 5211> mem 0x42000000-0x4200ffff irq 11 at device 14.0 on pci0
ath0: [GIANT-LOCKED]
ath0: mac 4.2 phy 3.0 5ghz radio 1.7 2ghz radio 2.3
ath0: Ethernet address: 00:01:24:70:54:a9
ath0: 11a rates: 6Mbps 9Mbps 12Mbps 18Mbps 24Mbps 36Mbps 48Mbps 54Mbps
ath0: 11b rates: 1Mbps 2Mbps 5.5Mbps 11Mbps
ath0: turbo rates: 6Mbps 9Mbps 12Mbps 18Mbps 24Mbps 36Mbps 48Mbps 54Mbps
ath0: <Atheros 5211> mem 0x42000000-0x4200ffff irq 11 at device 14.0 on pci0
ath0: [GIANT-LOCKED]
ath0: mac 4.2 phy 3.0 5ghz radio 1.7 2ghz radio 2.3
ath0: Ethernet address: 00:01:24:70:54:a9
ath0: 11a rates: 6Mbps 9Mbps 12Mbps 18Mbps 24Mbps 36Mbps 48Mbps 54Mbps
ath0: 11b rates: 1Mbps 2Mbps 5.5Mbps 11Mbps
ath0: turbo rates: 6Mbps 9Mbps 12Mbps 18Mbps 24Mbps 36Mbps 48Mbps 54Mbps