I usually trigger the crash merely by connecting to the server alone, killing a few zeds (to verify via headshots count if the server is connected to the master servers, etc.) and then leaving (or voting for next map, or even waiting for autovote, it doesn't seem to matter). It happens during the loading of the next map at the very begining during garbage collection BUT it doesn't happen every time, usually 9 out of 10, and I even had a whole game on one of the crashing maps.
Furthermore, I tried these maps 3 times each on two file-cache-verified debian 5 servers (linux) with mostly-vanilla killingfloor.ini, not in the same country (i can't find how to change your content server with the linux steam client, if somebody can help me with that i could at least try different content servers) one with custom maps, the other with original maps only (this one was pretty much built just to test those maps so it was as vanilla as can be), and they crashed them both minimum 2 times out of the 3 tries.
I haven't tried on another distribution, tweaked the kernel and all this hoodoo stuff but i would have if some windows servers were not having the same problem (while others reported their server not crashing with those maps) and when i hosted a dedicated server on my gaming rig, tried a few and, of course, none crashed.
But i still think that hose maps are worthy of inclusion, maybe with a warning that they might crash your server and should be tested