[Dovecot] Problem with imap running at 100%

[nuitari-dovecot at nuitari.net]

I was doing some checks on a server and found an imap process running at 
100%, kill -9 was unable to kill it.

hammer ~ # lsof -p 1918
COMMAND  PID     USER   FD   TYPE DEVICE SIZE/OFF    NODE NAME
imap    1918 vpopmail  cwd    DIR    8,2       96  539699 /var/vpopmail/domains/maxpersuasion.com/kec
imap    1918 vpopmail  rtd    DIR    8,2      856       2 /
imap    1918 vpopmail  txt    REG    8,2   851832 3646578 /usr/libexec/dovecot/imap
imap    1918 vpopmail  mem    REG    8,2  1330888 2752698 /lib64/libc-2.8.so
imap    1918 vpopmail  mem    REG    8,2    14520 2753738 /lib64/libdl-2.8.so
imap    1918 vpopmail  mem    REG    8,2   114960 2753800 /lib64/ld-2.8.so
imap    1918 vpopmail    2w  FIFO    0,5      0t0  574015 pipe
imap    1918 vpopmail    6u  0000    0,6        0      10 anon_inode

strace & gdb can't seem to attach to the process.

The process was started 2 days ago.

It is dovecot 1.1.6