I'm upgrading the linux kernel for all the front ends to one that is supposedly more stable and won't freeze when we unload RTS models (linux-image-3.2.88-csp). Since it's a different kernel version it requires rebuilds of all kernel-related support stuff (mbuf, symmetricom, mx, open-mx, dolphin) and all the front end models. All the support stuff has been upgraded, but we're now waiting on the front end rebuilds, which takes a while.
Initial testing indicates that the kernel is more stable; we're mostly able to unload/reload RTS modules without the kernel freezing. However, the c1iscey host seems to be oddly problematic and has frozen twice so far on module unloads. None of the other hosts have frozen on unload (yet), though, so still not clear.
We're now seeing some timing errors between the front ends and daqd, resulting in a "0x4000" status message in the 'C1:DAQ-DC0_*_STATUS' channels. Part of the problem was an issue with the IRIG-B/GPS receiver timing unit, which I'll log in a separate post. Another part of the problem was a bug in the symmetricom driver, which has been resolved. That wasn't the whole problem, though, since we're still seeing timing errors. Working with Jonathan to resolve.