Odd possibly TLS-related network hang

[Lars Magne Ingebrigtsen]

If I eval the following, Emacs hangs hard for five seconds:

(progn
  (url-retrieve 
"https://f.cloud.github.com/assets/54012/955557/7ed1352e-042c-11e3-91ec-8e27c707a011.png";
 'ignore)
  (url-retrieve 
"https://f.cloud.github.com/assets/54012/955360/3e5f0672-0429-11e3-8cfd-28a1ede5f5ef.png";
 'ignore))

strace tells me the following is happening:
  
[pid 13635] recvfrom(22, 0x7af24e0, 5, 0, 0, 0) = -1 EAGAIN (Resource 
temporarily unavailable)
[pid 13635] recvfrom(22, 0x7af24e0, 5, 0, 0, 0) = -1 EAGAIN (Resource 
temporarily unavailable)
[pid 13635] recvfrom(22, 0x7af24e0, 5, 0, 0, 0) = -1 EAGAIN (Resource 
temporarily unavailable)
[pid 13635] recvfrom(22, 0x7af24e0, 5, 0, 0, 0) = -1 EAGAIN (Resource 
temporarily unavailable)
[pid 13635] recvfrom(22, 0x7af24e0, 5, 0, 0, 0) = -1 EAGAIN (Resource 
temporarily unavailable)
[pid 13635] recvfrom(22, 0x7af24e0, 5, 0, 0, 0) = -1 EAGAIN (Resource 
temporarily unavailable)
[pid 13635] recvfrom(22, 0x7af24e0, 5, 0, 0, 0) = -1 EAGAIN (Resource 
temporarily unavailable)
[pid 13635] recvfrom(22, 0x7af24e0, 5, 0, 0, 0) = -1 EAGAIN (Resource 
temporarily unavailable)
[pid 13635] recvfrom(22, 0x7af24e0, 5, 0, 0, 0) = -1 EAGAIN (Resource 
temporarily unavailable)

[ a lot of snippage ]

Until it finally gets something:

[pid 13635] recvfrom(22, "\26\3\3\0Q", 5, 0, NULL, NULL) = 5

Looking at the code, it shouldn't be busy-waiting if it gets an EAGAIN,
should it?  At least it didn't use to...  Hm...

-- 
(domestic pets only, the antidote for overdose, milk.)
  No Gnus T-Shirt for sale: http://ingebrigtsen.no/no.php
  and http://lars.ingebrigtsen.no/2013/08/twenty-years-of-september.html