Peter Eisentraut <peter_e@gmx.net> writes:
> strace on the backend processes all showed them waiting at
> futex(0x7f1ee5e21c90, FUTEX_WAIT_PRIVATE, 2, NULL
> Notably, the first argument was the same for all of them.
Probably means they are blocked on semaphores. Stack traces would
be much more informative ...
regards, tom lane