Hi all, >> Aug 14 19:52:01 smtp01 postfix/postsuper[2634]: fatal: setuid(103): >> Resource temporarily unavailable
Looks like the issue was with the maximum number of user processes, as per /etc/security/limits.conf. It was set to 160, and apparently the new kernel and one of the other changes I made to support the new kernel, caused postfix to require more than 160 processes running at one time on the system. For reference, there was nothing further in the system or postfix logs, dmesg, or even by increasing the postfix logging level to the best of my ability. SELinux was also disabled on this system (security=0) since I'm sure the policy would be quite different from how I currently have the system configured, so that also wasn't an issue. > The error details suggest that there was some resource limit > violation when the postsuper process attempted to change from "root" > to "postfix" privileges. This is good to know. I was able to su to postfix without difficulty, apparently because I was running as another root user, and not the one that spawned postfix. My investigation also involved using lsof to determine the number of open files for the master process (I have two instances of postfix running): # ps ax | grep master 14352 ? Ss 0:08 /usr/libexec/postfix/master 14368 ? Ss 0:00 /usr/libexec/postfix/master # lsof -p 14352 -p 14368 | wc -l 188 Thanks for everyone's help! Thanks, Alex
