[squid-users] my squid can not start

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Hi,all
my squid get trouble ,and i can not restart squid .but after i reboot it ,i can start 
squid server.
the message is below
Jun 25 02:00:03 squid01 squid[29411]: Squid Parent: child process 29413 exited due to 
signal 6
Jun 25 01:59:59 squid01 squid[29411]: Squid Parent: child process 29441 started
Jun 25 02:00:00 squid01 (squid): msgget failed
how can i reslove this problem .
Thanks .