exit with signal 11

[Jay zh]

Dear:
    BIND version is 9.3.0. The bind daemon threw sig 11 and exited. Recently 
I have encountered this twice. Here is the log.

Dec 27 10:24:47 DNS named[2809]: resolver.c:2772: unexpected error:
Dec 27 10:24:47 DNS named[2809]: isc_timer_create: out of memory
Dec 27 10:24:47 DNS /kernel: pid 2809 (named), uid 53: exited on signal 11

Dec 29 19:58:23 DNS named[5230]: client.c:1909: unexpected error:
Dec 29 19:58:23 DNS named[5230]: isc_socket_accept() failed: unexpected 
error
Dec 29 19:58:23 DNS named[5230]: timer.c:650: unexpected error:
Dec 29 19:58:23 DNS named[5230]: couldn't allocate event
Dec 29 19:58:23 DNS /kernel: pid 5230 (named), uid 53: exited on signal 11

    My machine has 1GB memory. The average usage is below.

PID USERNAME PRI NICE  SIZE    RES STATE    TIME   WCPU    CPU COMMAND
   374 bind       2   0   470M   469M select 349:02 43.36% 43.36% named

    What's the reason? Do I need to add more memory or do some further 
checking? Thanks a lot.

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