Comment 5 for bug 264336

I get exactly the same error with nearly the same parameters:
2009-02-07 08:34:38 CET FATAL: could not create shared memory segment: Invalid argument
2009-02-07 08:34:38 CET DETAIL: Failed system call was shmget(key=5432001, size=39288832, 03600).
2009-02-07 08:34:38 CET HINT: This error usually means that PostgreSQL's [...]

But... I only get this at boot time, while postgres' automatic startup.
If I do a '/etc/init.d/postgresql-8.3 start' later, it works without any error message!

System: ubuntu-server 8.04.2 (x86_64), kernel 2.6.24-23-server
PostgreSQL: 8.3.5-0ubuntu0.8.04
kernel.shmmax = 268435456
kernel.shmall = 2097152
kernel.shmmni = 4096