Console log flooded with discoveryd errors. How can I make them stop (not just hide them)?

Question

They are 3,500 out of the 4,000 of the latest messages. They are always of the form:

1/5/15 1:07:38.307 PM discoveryd[49]: Basic Sockets Couldn't set IP_BOUND_IF on socket fd[73] scopeID[11] errno[22] result[-1]
1/5/15 1:07:40.487 PM discoveryd[49]: Basic Sockets Couldn't set IP_BOUND_IF on socket fd[68] scopeID[11] errno[22] result[-1]
1/5/15 1:07:40.489 PM discoveryd[49]: Basic Sockets Couldn't set IP_BOUND_IF on socket fd[70] scopeID[11] errno[22] result[-1]
1/5/15 1:07:40.911 PM discoveryd[49]: Basic Sockets Couldn't set IP_BOUND_IF on socket fd[73] scopeID[11] errno[22] result[-1]
1/5/15 1:07:42.668 PM discoveryd[49]: Basic Sockets Couldn't set IP_BOUND_IF on socket fd[73] scopeID[11] errno[22] result[-1]
1/5/15 1:07:43.099 PM discoveryd[49]: Basic Sockets Couldn't set IP_BOUND_IF on socket fd[76] scopeID[11] errno[22] result[-1]
1/5/15 1:07:45.281 PM discoveryd[49]: Basic Sockets Couldn't set IP_BOUND_IF on socket fd[68] scopeID[11] errno[22] result[-1]
1/5/15 1:07:45.963 PM discoveryd[49]: Basic Sockets Couldn't set IP_BOUND_IF on socket fd[70] scopeID[11] errno[22] result[-1]
1/5/15 1:07:48.062 PM discoveryd[49]: Basic Sockets Couldn't set IP_BOUND_IF on socket fd[73] scopeID[11] errno[22] result[-1]
1/5/15 1:07:49.151 PM discoveryd[49]: Basic Sockets Couldn't set IP_BOUND_IF on socket fd[68] scopeID[11] errno[22] result[-1]
1/5/15 1:07:50.250 PM discoveryd[49]: Basic Sockets Couldn't set IP_BOUND_IF on socket fd[68] scopeID[11] errno[22] result[-1]
1/5/15 1:07:51.345 PM discoveryd[49]: Basic Sockets Couldn't set IP_BOUND_IF on socket fd[70] scopeID[11] errno[22] result[-1] 

And so on. The output of lsof -d on the file descriptors in the error messages (68, 70, 73) is:

13:12:35 BigG ~ $ sudo lsof -d 70
COMMAND    PID           USER   FD   TYPE             DEVICE SIZE/OFF     NODE NAME
UserEvent   17           root   70r   DIR                1,4     3638 16936208 /private/var/log
Little      39           root   70   PIPE 0xc31978735fec6a0b    16384          
discovery   49 _mdnsresponder   70u  IPv4 0xc3197873535be7db      0t0      UDP *:60078
filecoord  229           root   70r   DIR                1,4      102 17141816 /Applications/Messages.app
cloudd     237         george   70u  unix 0xc319787357d38073      0t0          ->0xc319787357d38393
com.apple 6884         george   70r   CHR               11,0 0t147584      577 /dev/random
Mail      6916         george   70u  unix 0xc319787357d366ab      0t0          ->0xc319787357d54a9b
13:12:54 BigG ~ $ sudo lsof -d 68
COMMAND    PID           USER   FD   TYPE             DEVICE SIZE/OFF     NODE NAME
UserEvent   17           root   68r   DIR                1,4     2278 16936222 /Library
Little      39           root   68   PIPE 0xc31978735fec695b    16384          
discovery   49 _mdnsresponder   68u  IPv6 0xc319787358001583      0t0      UDP *:56376
filecoord  229           root   68r   DIR                1,4      170 18984735 /Users/george/Library/Mobile Documents/com~apple~mail/Data/MailData
Mail      6916         george   68u  IPv4 0xc31978735c27fb4b      0t0      TCP 172.20.10.2:65427->17.172.34.90:imaps (ESTABLISHED)
Google    7531         george   68u   REG                1,4    45056  2751867 /Users/george/Library/Application Support/Google/Chrome/Default/Shortcuts
13:13:01 BigG ~ $ sudo lsof -d 73
COMMAND    PID           USER   FD   TYPE             DEVICE SIZE/OFF     NODE NAME
Little      39           root   73   PIPE 0xc31978735fec72fb    16384          
discovery   49 _mdnsresponder   73u  IPv6 0xc31978735694dfb3      0t0      UDP *:56847
filecoord  229           root   73r   DIR                1,4     1224 18983081 /Users/george/Library/Mobile Documents
Mail      6916         george   73u   REG                1,4      512 19235471 /private/var/folders/hj/3s2lw9xx18zf5gx13b5wkp0c0000gn/T/com.apple.mail/etilqs_Q2RlNGOuSx38TFf
Google    7531         george   73u   REG                1,4    18432  2752345 /Users/george/Library/Application Support/Google/Chrome/Default/Login Data

This flood does not happen on my home WiFi, but is occurring while using an iPhone (iOS 8.1.2) plugged into the USB port AND over Bluetooth PAN networking on a MBP Retina (10.10.1).

In the past the file descriptors in the error messages were different, but it was always three different ones.

Answer 1

Long term, the way to fix this is to opt in to sharing your logs and crashes with Apple and reporting this as a bug at http://bugreport.apple.com

Short term, you can choose a different network (probably a bad option) or suppress IPv6 (also probably bad long term) or try and disable the error logging entirely (probably bad).

4k lines of error messages isn't really a flood on any OS X hardware in the last dozen years. Even 400k messages a day isn't any significant load on the filesystem or the CPU. Is there something else you're trying to do where these messages are causing grief?

Answer 2

When i get these messages any DNS lookups made using discoveryd fail (Chrome and nslookup work). Workaround:

sudo launchctl unload -w /System/Library/LaunchDaemons/com.apple.discoveryd.plist
sudo launchctl load -w /System/Library/LaunchDaemons/com.apple.discoveryd.plist