mod_fcgid doesn't work in 9-stable jails after upgrade from 8.x

[Attila Nagy]

Hi,

I've just tried to upgrade a machine running an older 8-stable to 
9-stable at r242549M without success.
It runs an apache with mod_fcgid in a jail and the latter can't start 
with the error message of:
[Sun Nov 04 16:09:12 2012] [emerg] (78)Function not implemented: 
mod_fcgid: Can't create shared memory for size 1192488 bytes

security.jail.sysvipc_allowed is enabled (it was needed on 8.x too), 
nothing else has changed.

There are some reports from this, but from earlier versions, and the 
only confirmed solution was sysvipc_allowed, which works for 8.x, but 
doesn't with the above version.

Any ideas?