가끔 IBM System p시리즈에서 BONDING DEVICE가 HANG을 일으키는 현상?

[이누기]

가끔 IBM System p시리즈에서 BONDING DEVICE가 HANG을 일으키는 현상?

Release Found: Red Hat Enterprise Linux 5.2 ppc for IBM Series p

Limitation: Only applies to Red Hat Enterprise Linux 5.2 on IBM Series p when using ehea adapters in a bonding configuration.

Symptom:

eHEA ethernet devices can be bound to a bonding device. When removing the bonding device it is important to detach all ehea ethernet devices from the bonding device before unloading the bonding module. Otherwise the unload operation will hang.

Solution:

modprobe bonding mode=active-backup miimon=10
 ifconfig bond0 A.B.C.D up
 ifenslave bond0 eth0

[where eth0 is an ehea]

ifenslave -d bond0 eth0 #<--- this is important

rmmod bonding

Caveats:

The following error messages might be displayed when bonding is setup / removed (these error messages do not impact the functionality of the bonding interface. Once setup, bonding works as expected):

- ehea: Error in ehea_broadcast_reg_helper: reg_dereg_bcmc failed
 - Debug: sleeping function called from invalid context at mm/slab.c:2063
 in_atomic():1[expected: 0], irqs_disabled():0
 Call Trace:
 [c0000000a4712f70] [c00000000005d7c8] .__might_sleep+0xcc/0xec 
(unreliable)
 [c0000000a4713010] [c0000000000a1c28] .__kmalloc+0x70/0x104
 [c0000000a47130a0] [c0000000000a1ecc] .kzalloc+0x1c/0x50
 [c0000000a4713130] [d0000000000c30e4] .ehea_get_stats+0x50/0x194 [ehea]
 [c0000000a47131d0] [d0000000002eddf0] .bond_get_stats+0xb0/0x298 
[bonding]
 [c0000000a4713380] [c00000000028ee24] .rtnetlink_fill_ifinfo+0x460/0x5a0
 [c0000000a47134c0] [c00000000028efe4] .rtnetlink_dump_ifinfo+0x80/0xdc
 [c0000000a4713560] [c0000000002a3488] .netlink_dump+0x118/0x2f8
 [c0000000a4713640] [c0000000002a3830] .netlink_dump_start+0x1c8/0x1fc
 [c0000000a47136f0] [c00000000028f74c] .rtnetlink_rcv+0x1c4/0x54c!

 [c0000000a47137d0] [c0000000002a3180] .netlink_data_ready+0x4c/0xb0
 [c0000000a4713850] [c0000000002a20f4] .netlink_sendskb+0xfc/0x158
 [c0000000a47138f0] [c0000000002a2e3c] .netlink_sendmsg+0x348/0x394
 [c0000000a4713a00] [c0000000002754b8] .sock_sendmsg+0x108/0x14c
 [c0000000a4713c00] [c000000000277798] .sys_sendto+0xdc/0x118
 [c0000000a4713d90] [c00000000029887c] .compat_sys_socketcall+0x160/0x210
 [c0000000a4713e30] [c000000000011280] syscall_exit+0x0/0x18