I wrote:
> It doesn't seem to be a platform-specific problem: I can duplicate the
> failure here by applying same settings mandrill uses, ie build with
> -DRANDOMIZE_ALLOCATED_MEMORY and set force_parallel_mode = regress.
Oh ... scratch that: you don't even need -DRANDOMIZE_ALLOCATED_MEMORY.
For some reason I just assumed that any parallelism-related patch
would have been tested with force_parallel_mode = regress. This one
evidently was not.
regards, tom lane