[exim] Exim4 crashed..?

Hi

Exim4 recently locked up:

syslog:

Jun 10 23:31:23 ayako kernel: printk: 1601 messages suppressed.
Jun 10 23:31:23 ayako kernel: 4gb seg fixup, process exim4 (pid 7016),
cs:ip 73:b7807870
Jun 10 23:31:28 ayako kernel: printk: 5667 messages suppressed.
Jun 10 23:31:28 ayako kernel: 4gb seg fixup, process imap-login (pid
6900), cs:ip 73:b7d0b256
Jun 10 23:31:33 ayako kernel: printk: 1529583 messages suppressed.
Jun 10 23:31:33 ayako kernel: 4gb seg fixup, process imap-login (pid
6900), cs:ip 73:b7d0b256
Jun 10 23:31:38 ayako kernel: printk: 4326 messages suppressed.
Jun 10 23:31:38 ayako kernel: 4gb seg fixup, process bash (pid 6073),
cs:ip 73:b7e15935
Jun 10 23:31:43 ayako kernel: printk: 2763 messages suppressed.
Jun 10 23:31:43 ayako kernel: 4gb seg fixup, process exim4 (pid 7027),
cs:ip 73:b783853e
Jun 10 23:31:48 ayako kernel: printk: 6213 messages suppressed.
Jun 10 23:31:48 ayako kernel: 4gb seg fixup, process exim4 (pid 6488),
cs:ip 73:b7807870
Jun 10 23:31:53 ayako kernel: printk: 4280 messages suppressed.
Jun 10 23:31:53 ayako kernel: 4gb seg fixup, process imap-login (pid
6900), cs:ip 73:b7d0b256
Jun 10 23:31:58 ayako kernel: printk: 1674 messages suppressed.
Jun 10 23:31:58 ayako kernel: 4gb seg fixup, process exim4 (pid 7042),
cs:ip 73:b7807870

I was wondering if anyone has any advice regarding this?

It is running on a XEN VPS.

Kind regards,
Samuel