[PostgreSQL-Hackers] cuckoo is hung during regression test

The 8.1 build for cuckoo is currently hung, with the *postmaster* taking
all the CPU it can get. The build started almost 5 hours ago.

The postmaster is stuck in the following loop, according to
ktrace/kdump:

2023 postgres RET write 59/0x3b
2023 postgres CALL close(0xffffffff)
2023 postgres RET close -1 errno 9 Bad file descriptor
2023 postgres CALL sigprocmask(0x3,0x2e6400,0)
2023 postgres RET sigprocmask 0
2023 postgres CALL select(0x8,0xbfffe194,0,0,0xbfffe16c)
2023 postgres RET select 1
2023 postgres CALL sigprocmask(0x3,0x2f0d38,0)
2023 postgres RET sigprocmask 0
2023 postgres CALL accept(0x7,0x200148c,0x200150c)
2023 postgres RET accept -1 errno 24 Too many open files
2023 postgres CALL write(0x2,0x2003928,0x3b)
2023 postgres GIO fd 2 wrote 59 bytes
"LOG: could not accept new connection: Too many open files
"
2023 postgres RET write 59/0x3b
2023 postgres CALL close(0xffffffff)
2023 postgres RET close -1 errno 9 Bad file descriptor
2023 postgres CALL sigprocmask(0x3,0x2e6400,0)
2023 postgres RET sigprocmask 0
2023 postgres CALL select(0x8,0xbfffe194,0,0,0xbfffe16c)
2023 postgres RET select 1
2023 postgres CALL sigprocmask(0x3,0x2f0d38,0)
2023 postgres RET sigprocmask 0
2023 postgres CALL accept(0x7,0x200148c,0x200150c)
2023 postgres RET accept -1 errno 24 Too many open files
2023 postgres CALL write(0x2,0x200381c,0x3b)
2023 postgres GIO fd 2 wrote 59 bytes
"LOG: could not accept new connection: Too many open files
"
2023 postgres RET write 59/0x3b

ulimit is set to 1224 open files, though I seem to keep bumping into that
(anyone know what the system-level limit is, or how to change it?)

Is there other useful info to be had about this process, or should I just kill
it?