Tested with: 3.2.5 (64-bit)
Proposed fix
Here is the case: the boss brain spawns a RandomSpawner which spawns a BOSS- or BOSSDEATH-flagged monster. In this case, the spawner stays until the spawned monster dies (to call A_BossDeath). If the boss brain is killed while the spawner is around. A_BrainDie will try and kill the spawner (that is, if the sv_killbossmonst CVAR is set to true), only to fail in doing so, because RandomSpawners can't be killed. Basically, each time the engine iterates through the actors to kill, the spawner will always meet the conditions to trigger a loop to kill more monsters.
To test, run the attached file with Doom 2 on MAP30. Set the sv_killbossmonst CVAR to true. Wait for the boss brain to spawn a baron of hell. Kill the boss brain. Shortly after, the engine will lock up.
A case of infinite loop in A_BrainDie
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