I have the same problem on my L4D2 server.
The server crash exactly when the map is switched and the new map has not even started to load:
Code:
Saving weapon_ammo_spawn at -11291, 3094, 208 (model models/props/terror/ammo_stack.mdl)
Saving weapon_pistol_spawn at -11054, 3234, 207 (model models/w_models/weapons/w_pistol_B.mdl)
Saving weapon_rifle_sg552 at -10066, 1983, 129
Saving weapon_smg at -9995, 1751, 129
Saving weapon_pumpshotgun at -10313, 2461, 130
Saving weapon_smg_mp5 at -10491, 2730, 130
S♪ck: hi
---- Host_Changelevel ----
CUtlRBTree overflow!
CUtlRBTree overflow!
#Game_srv.so loaded for "Left 4 Dead 2"
Server is hibernating
ConVarRef test_progression_loop doesn't point to an existing ConVar
Parent cvar in server.dll not allowed (spit_scaling_min_scale)
Tickrate_Enabler: Found ServerGameDLL at ServerGameDLL005
Tickrate_Enabler: Found VEngineServer at VEngineServer022
Tickrate_Enabler: Set TickRate 60
In this case, all the players who played on the server, hangs the loading.
Most often this happens on the map
c1m3_mall -> c1m4_atrium