exit with signal 11

[Mark Andrews]

> 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

	Looks like bugs on the error paths.  If you have core dumps
	stack backtraces would be useful.  Note as you are running with
	'named -u' core dumping will be disabled as a side effect of the
	setuid() call.  This can be overridden on some systems.

	e.g.
		FreeBSD: sysctl kern.sugid_coredump=1

	Stack backtraces along w/ associated error messages should be
	sent to bind9-bugs at isc.org.  Individual messages failure.
 
>     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.

	You need to ensure the process gets more memory or limit the
	about of memory the process uses.

	Increase the per/process memory limit (note on some OS the kernel
	may also need to be tuned to allow bigger per/process limits).

		options { datasize 1000M; };
 
	Limit the amount of memory used by the process.

		options/view { max-cache-size 300M; };

	Note: this limits the memory used by the cache.  You also need
	to account for the memory used to serve zones, etc.  Each cache
	has a seperate limit.

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> 
--
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark_Andrews at isc.org