rndc stalls on any command -- maybe because 127.0.0.1 is not in routing table?

[Nicholas Tung]

Hi all,

    The rndc tool, which is used for all BIND configuration (yast,
/etc/init.d/named stop), appears to stall on any command. See [Listing
1] for output before it stalls ("freezes" not in the DNS zone sense)
and [Listing 2] for afterwards.

    I used lsof to show the open files [Listing 3]. The last line
doesn't appear to say it's a "localhost" source, and "localhost"
doesn't seem to be in the routing tables [Listing 4]. Could this be
the problem? If it is, could anyone consider adding a warning (or
maybe even failing if an override option isn't set)?

Thanks very much,
Nicholas — ntung at ntung —  https://ntung.com




=== Listing 1 -- output of command, process waits after last line ===
> rndc -V stop
create memory context
create socket manager
create task manager
create task
create logging context
setting log tag
creating log channel
enabling log channel
create parser
get key
decode base64 secret
stop
post event
using server 127.0.0.1 (127.0.0.1#953)
create socket
bind socket
connect

=== Listing 2 -- message after wait ===
rndc: connect failed: 127.0.0.1#953: timed out

=== Listing 3 -- open files when rndc is frozen ===
> lsof -p $(ps -C rndc -o pid=) +L
COMMAND   PID USER   FD   TYPE DEVICE SIZE/OFF NLINK    NODE NAME
rndc    19939 root  cwd    DIR   8,18    12288   108    8193 /etc
rndc    19939 root  rtd    DIR   8,18     4096    23       2 /
rndc    19939 root  txt    REG   8,18    31800     1 1055141 /usr/sbin/rndc
rndc    19939 root  mem    REG   8,18   346560     1  786938
/lib64/libm-2.10.1.so
rndc    19939 root  mem    REG   8,18    88640     1  786849
/lib64/libz.so.1.2.3
rndc    19939 root  mem    REG   8,18    14872     1  786933
/lib64/libdl-2.10.1.so
rndc    19939 root  mem    REG   8,18  1360392     1 7471871
/usr/lib64/libxml2.so.2.7.3
rndc    19939 root  mem    REG   8,18  1605840     1 7472655
/usr/lib64/libcrypto.so.0.9.8
rndc    19939 root  mem    REG   8,18   131260     1  786809
/lib64/libpthread-2.10.1.so
rndc    19939 root  mem    REG   8,18  1408560     1  786838
/lib64/libc-2.10.1.so
rndc    19939 root  mem    REG   8,18   354120     1 7471241
/usr/lib64/libisc.so.50.1.1
rndc    19939 root  mem    REG   8,18  1497256     1 7471310
/usr/lib64/libdns.so.53.0.0
rndc    19939 root  mem    REG   8,18    43680     1 7475078
/usr/lib64/libbind9.so.50.0.3
rndc    19939 root  mem    REG   8,18    35616     1 7471143
/usr/lib64/libisccc.so.50.0.0
rndc    19939 root  mem    REG   8,18   120168     1 7471234
/usr/lib64/libisccfg.so.50.0.0
rndc    19939 root  mem    REG   8,18   127680     1  786832 /lib64/ld-2.10.1.so
rndc    19939 root    0u   CHR  136,3      0t0     1       6 /dev/pts/3
rndc    19939 root    1u   CHR  136,3      0t0     1       6 /dev/pts/3
rndc    19939 root    2u   CHR  136,3      0t0     1       6 /dev/pts/3
rndc    19939 root    3r  FIFO    0,8      0t0     1   84973 pipe
rndc    19939 root    4w  FIFO    0,8      0t0     1   84973 pipe
rndc    19939 root    5u  0000    0,9        0     1     679 anon_inode
rndc    19939 root    7r   REG    0,3        0     1   10516 /proc/2283/status
rndc    19939 root   20u  IPv4  84977      0t0           TCP
c-98-207-60-37.hsd1.ca.comcast.net:55316->localhost:953 (SYN_SENT)

=== Listing 4 -- route configuration ===
> ip route show
98.207.60.0/22 dev eth-inet  proto kernel  scope link  src 98.207.60.37
169.254.0.0/16 dev eth0  scope link
192.168.0.0/16 dev eth0  proto kernel  scope link  src 192.168.2.1
192.168.0.0/16 dev eth1  proto kernel  scope link  src 192.168.2.2
default via 98.207.60.1 dev eth-inet