see #295136. The problem is actually in the amixer executable, which
gets invoked about 15 times during shutdown. The problem is reproducable
(for me) by running amixer in single-user mode. strace log can be found
in the mentioned report.

For reference, see the following note in the news section on 
http://0pointer.de/lennart/projects/nss-mdns/:
"Please note that due to security reasons from this release on the minimal mDNS 
stack included in nss-mdns (dubbed "legacy") is no longer built by default. 
Thus, nss-mdns will not work unless Avahi is running! That makes Avahi 
essentially a hard dependency of nss-mdns."

And see the following lines in the strace log:
0.000069 open("/lib/libnss_mdns4_minimal.so.2", O_RDONLY) = 5
0.000069 connect(5, {sa_family=AF_INET, sin_port=htons(53), 
sin_addr=inet_addr("192.168.1.1")}, 28) = 0
4.013297 ioctl(5, FIONREAD, [37])  = 0

That still does not answer the question why the ** amixer needs to do
dns resolution in the first place...

-- 
MASTER storing ALSA mixer element values during shutdown hangs 
nondeterministically if non-loopback network interfaces are still up
https://bugs.launchpad.net/bugs/274995
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