Significant memory usage

Mon May 19 04:30:49 UTC 2025

Well, you’ve provided basically nothing as leads, so it is hard to tell what’s going on with just output of named -V.

I would suggest to recompile names with jemalloc enabled and then use jemalloc profiling to see where the memory goes.

See https://www.isc.org/blogs/2023-BIND-memory-management-explained/ for more details (search for jeprof for tldr).

Ondrej
--
Ondřej Surý — ISC (He/Him)

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> On 18. 5. 2025, at 23:21, Philip Prindeville via bind-users <bind-users at lists.isc.org> wrote:
> 
> Hi,
> 
> I’ve been running 9.20.7 on OpenWRT for over a year without issues.  Yesterday, however, it died because of OOM (out-of-memory) kill from the kernel.
> 
> I use it with isc-dhcp service for IPv4, and do split horizon for internal domains.
> 
> What I’ve noticed is that at startup I’m using about 33K pages as the VSZ (per top on x86_64 hardware).
> 
> Within a minute, however, that’s doubled to 72600+ pages.  More than double.
> 
> This is a small network with 1 domain (plus two rDNS domains), and not more than 400 RR’s total.
> 
> If I do an “rndc flush” is drops about 3000 pages, but slowly starts creeping up again.
> 
> I updated to 9.20.8 a few minutes ago but I’m still seeing the same issue.
> 
> root at OpenWrt:~# named -V
> BIND 9.20.8 (Stable Release) <id:>
> running on Linux x86_64 6.6.41 #0 SMP Sat Jul 27 03:38:57 2024
> built by make with  '--target=x86_64-openwrt-linux' '--host=x86_64-openwrt-linux' '--build=x86_64-pc-linux-gnu' '--disable-dependency-tracking' '--program-prefix=' '--program-suffix=' '--prefix=/usr' '--exec-prefix=/usr' '--bindir=/usr/bin' '--sbindir=/usr/sbin' '--libexecdir=/usr/lib' '--sysconfdir=/etc' '--datadir=/usr/share' '--localstatedir=/var' '--mandir=/usr/man' '--infodir=/usr/info' '--disable-geoip' '--with-openssl=/home/philipp/lede/staging_dir/target-x86_64_musl/usr' '--without-lmdb' '--without-readline' '--sysconfdir=/etc/bind' '--with-json-c=no' '--with-libxml2=no' '--enable-doh' '--without-gssapi' 'build_alias=x86_64-pc-linux-gnu' 'host_alias=x86_64-openwrt-linux' 'target_alias=x86_64-openwrt-linux' 'CC=x86_64-openwrt-linux-musl-gcc' 'CFLAGS=-Os -pipe -g3 -fno-caller-saves -fno-plt -fhonour-copts -fmacro-prefix-map=/home/philipp/lede/build_dir/target-x86_64_musl/bind-9.20.8=bind-9.20.8 -Wformat -Werror=format-security -fstack-protector -D_FORTIFY_SOURCE=1 -Wl,-z,now -Wl,-z,relro   ' 'LDFLAGS=-L/home/philipp/lede/staging_dir/toolchain-x86_64_gcc-14.2.0_musl/usr/lib -L/home/philipp/lede/staging_dir/toolchain-x86_64_gcc-14.2.0_musl/lib -fuse-ld=bfd -znow -zrelro   -Wl,--gc-sections,--as-needed ' 'CPPFLAGS=-I/home/philipp/lede/staging_dir/toolchain-x86_64_gcc-14.2.0_musl/usr/include -I/home/philipp/lede/staging_dir/toolchain-x86_64_gcc-14.2.0_musl/include -I/home/philipp/lede/staging_dir/toolchain-x86_64_gcc-14.2.0_musl/include/fortify   ' 'PKG_CONFIG=/home/philipp/lede/staging_dir/host/bin/pkg-config' 'PKG_CONFIG_PATH=/home/philipp/lede/staging_dir/target-x86_64_musl/usr/lib/pkgconfig:/home/philipp/lede/staging_dir/target-x86_64_musl/usr/share/pkgconfig' 'PKG_CONFIG_LIBDIR=/home/philipp/lede/staging_dir/target-x86_64_musl/usr/lib/pkgconfig:/home/philipp/lede/staging_dir/target-x86_64_musl/usr/share/pkgconfig'
> compiled by GCC 14.2.0
> compiled with OpenSSL version: OpenSSL 3.0.16 11 Feb 2025
> linked to OpenSSL version: OpenSSL 3.0.14 4 Jun 2024
> compiled with libuv version: 1.48.0
> linked to libuv version: 1.48.0
> compiled with liburcu version: 0.15.2
> compiled with libnghttp2 version: 1.63.0
> linked to libnghttp2 version: 1.62.1
> compiled with zlib version: 1.3.1
> linked to zlib version: 1.3.1
> threads support is enabled
> DNSSEC algorithms: RSASHA1 NSEC3RSASHA1 RSASHA256 RSASHA512 ECDSAP256SHA256 ECDSAP384SHA384 ED25519 ED448
> DS algorithms: SHA-1 SHA-256 SHA-384
> HMAC algorithms: HMAC-MD5 HMAC-SHA1 HMAC-SHA224 HMAC-SHA256 HMAC-SHA384 HMAC-SHA512
> TKEY mode 2 support (Diffie-Hellman): no
> TKEY mode 3 support (GSS-API): no
> 
> default paths:
>  named configuration:  /etc/bind/named.conf
>  rndc configuration:   /etc/bind/rndc.conf
>  nsupdate session key: /var/run/named/session.key
>  named PID file:       /var/run/named/named.pid
> root at OpenWrt:~#
> 
> What would explain the sudden increase in memory usage when the environment has been relatively static?
> 
> Thanks,
> 
> -Philip
> 
> 
> 
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