Apple's server farm hardware includes:
- HP rack servers
- Teradata Extreme Data Appliances -
- NetApp FAS6200 Series Enterprise Storage
These run either:
- Solaris or
- Red Hat Enterprise Linux or its free clone: CentOS Linux or
- SUSE Linux 10, SP3 - which comes with the Teradata Extreme Data Appliances
The bug that took down Apple's developer servers are in Linux or Solaris or the database software used in the Teradata Extreme Data Appliances or Apple's custom applications for their Developer Center.
Thus, whatever was corrected won't apply to Mac OS X.
Could apple not just use the core kernel of OSX? they don't need a full gui.. And they could theoretically write the code for the HP servers...
but yeah, its most likely some kind of linux.