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

Rick Dicaire kritek at gmail.com
Sun Jan 24 19:19:06 UTC 2010


Is lo up?
Is named actually listening on 127.0.0.1:953?
Is there a firewall?

On Sun, Jan 24, 2010 at 1:29 PM, Nicholas Tung <ntung at ntung.com> wrote:
> 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
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