CSCsy35054 - NP1/2 UDP conns not updated when MAC address changes

We have a customer that appears to be experiencing this bug but with FWSM 4.1(15).
There is a Linux HA solution on one side of the FWSM and when a failover occurs the Linux HA sends a Gratuitous ARP which updates the FWSM ARP cache however not all connections are updated. If we sniff traffic exiting the FWSM we can see the destination MAC address for 'some' existing connections have the wrong MAC address (the old MAC address). The clients are constantly sending traffic (SIP) to the Linux server so the connection states are continually refreshed. If we manually clear the connections or let them time out by disconnecting one of the SIP clients for 30-minutes (the default SIP control channel session timeout) it recovers, however this isn't practical.
We have recommended introducing a layer-3 hop between the FWSM and the Linux HA devices as we suspect this will solve the problem (i.e. the destination MAC will be the L3 next-hop and not the Linux server itself). In looking at the issue we identified the behaviour as the same as that documented under BugID: CSCsy35054, however this says it appeared in 3.2(6) and was fixed in 3.2(12.1) & 4.0(5.4) however we are running 4.1(15) which is the latest release.
Any other ideas?
Andy

Well your configuration looks great to me... nothing is obviously standing out at least..
If the routers ping request makes it to your client, then the router must at least be able to arp for you.
Have you tried to ping the gateway from the WLC itself? (vlan 171 it appears)
I'm curious if the WLC even gets the ping through. 'show arp switch' on the WLC would show its arp table as well...
I'm not very proficient with the router debugging, but perhaps there is some kind of ARP debug you can run to verify if the ARP request is even coming out of the WLC from your client?
Again, the config looks go to me, so either this is a situation where a nice save config and reboot would come in handy (perhaps coupled with shutting down the interfaces and turning them back on)..... or something just isn't right....
Does this happen with the other vlans you have coming in to the WLC? Perhaps there is just something going on the router side where it isn't responding to the arp.... which comes back to the whole shutting down interfaces and/or rebooting. Obviously this isn't root-cause, but should at least provide sanity-check.

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