I'm getting orphaned processes on our mail servers. Some machines has

processes hanging around from a week ago. I'm running the current stable of dovecot 2.1.15, but the problem has been happening for a while now. I thought it would be good to report the issue. I ran an strace on one of them and this is the output:

Process 21370 attached - interrupt to quit open("/var/run/dovecot/stats-mail", O_WRONLY) = 7 write(7, "DISCONNECT\ta09ade0350d81d517a530"..., 44) = 44 munmap(0x7f1ad8a8d000, 266240) = 0 close(13) = 0 close(12) = 0 epoll_ctl(9, EPOLL_CTL_DEL, 11, {0, {u32=17384128, u64=17384128}}) = 0 close(11) = 0 close(7) = 0 munmap(0x7f1ada5d6000, 2106272) = 0 munmap(0x7f1ada7d9000, 2161360) = 0 munmap(0x7f1ada3cf000, 2124136) = 0 munmap(0x323c800000, 2162768) = 0 munmap(0x7f1ad9fc8000, 2102976) = 0 munmap(0x7f1ada1ca000, 2114728) = 0 epoll_ctl(9, EPOLL_CTL_DEL, 4, {0, {u32=17319120, u64=17319120}}) = 0 close(4) = 0 close(8) = 0 close(9) = 0 exit_group(0) = ? Process 21370 detached

As you can see, the process exited at that point. Any ideas?

...Jeff