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@OpenWrt:~# named -V
BIND 9.20.8 (Stable Release)
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@OpenWrt:~#
What would explain the sudden increase in memory usage when the environment has
been relatively static?
Thanks,
-Philip
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