### Please describe the problem.

A mere `git annex sync` does not go through the reachable remotes.

### What steps will reproduce the problem?

I do not know what could have put my repository in this state.

### What version of git-annex are you using? On what operating system?

git-annex version: 4.20130802-g1452ac3
build flags: Assistant Webapp Pairing Testsuite S3 WebDAV Inotify DBus XMPP
local repository version: 4
default repository version: 3
supported repository versions: 3 4
upgrade supported from repository versions: 0 1 2

Linux dawn 3.10.3-1-ARCH #1 SMP PREEMPT Fri Jul 26 11:26:59 CEST 2013 x86_64 GNU/Linux

### Please provide any additional information below.

[[!format sh """
% git annex status
supported backends: SHA256E SHA1E SHA512E SHA224E SHA384E SHA256 SHA1 SHA512 SHA224 SHA384 WORM URL
supported remote types: git S3 bup directory rsync web webdav glacier hook
repository mode: direct
trusted repositories: 1
	f3cb4e8f-65f1-4ded-a6a1-abef64ddcff5 -- zoidberg (sam@git-annex:/media/git-annex/Music)
semitrusted repositories: 5
	00000000-0000-0000-0000-000000000001 -- web
 	063a31dc-542d-407f-a9ed-124479fa6354 -- here (dawn)
 	22b72aa6-058b-4622-8132-27aa2d8950dc -- arrakis (sam@arrakis:~/Music)
 	5b3a1abf-5e0b-41bc-a141-774d6236ec76 -- backup on old USB disk
 	6affec3c-fd26-11e2-9ddd-53f02e5ca176 -- music on eeePC
untrusted repositories: 0
transfers in progress: none
available local disk space: 9.83 gigabytes (+1 megabyte reserved)
local annex keys: 3947
local annex size: 23.51 gigabytes
known annex keys: 3965
known annex size: 23.56 gigabytes
bloom filter size: 16 mebibytes (0.8% full)
backend usage: 
	SHA256E: 7912

% git remote -v
arrakis	arrakis:Music (fetch)
arrakis	arrakis:Music (push)
zoidberg	ssh://git-annex@zoidberg.rfc1149.net:2222/~/Music (fetch)
zoidberg	ssh://git-annex@zoidberg.rfc1149.net:2222/~/Music (push)

# Note how here it does not seem to sync with any remote
% git annex sync
(Recording state in git...)
commit  
ok

% git annex sync zoidberg
(Recording state in git...)
commit  
ok
pull zoidberg 
ok
push zoidberg 
Everything up-to-date
ok

% git annex sync arrakis
(Recording state in git...)
commit  
ok
pull arrakis 
From arrakis:Music
   c1a24bd..ba060b7  git-annex  -> arrakis/git-annex
   98b9a8e..be9c146  master     -> arrakis/master
   e0df2be..be9c146  synced/master -> arrakis/synced/master
ok

# A nameless sync with debug turned on
% git annex sync --debug        
[2013-08-06 10:59:57 CEST] read: git ["--git-dir=/home/sam/Music/.git","--work-tree=/home/sam/Music","symbolic-ref","HEAD"]
[2013-08-06 10:59:57 CEST] read: git ["--git-dir=/home/sam/Music/.git","--work-tree=/home/sam/Music","show-ref","refs/heads/master"]
[2013-08-06 10:59:57 CEST] read: git ["--git-dir=/home/sam/Music/.git","--work-tree=/home/sam/Music","show-ref","git-annex"]
[2013-08-06 10:59:57 CEST] read: git ["--git-dir=/home/sam/Music/.git","--work-tree=/home/sam/Music","show-ref","--hash","refs/heads/git-annex"]
[2013-08-06 10:59:57 CEST] read: git ["--git-dir=/home/sam/Music/.git","--work-tree=/home/sam/Music","log","refs/heads/git-annex..ba060b7777413ab687d64771b5d6c2b36a072335","--oneline","-n1"]
[2013-08-06 10:59:57 CEST] read: git ["--git-dir=/home/sam/Music/.git","--work-tree=/home/sam/Music","log","refs/heads/git-annex..f401f2b7b67567862df7c5b8d304f52c3af43f4b","--oneline","-n1"]
[2013-08-06 10:59:57 CEST] read: git ["--git-dir=/home/sam/Music/.git","--work-tree=/home/sam/Music","log","refs/heads/git-annex..feaba7c5ea5f4ca73c123e6ea44ffd6333bf383e","--oneline","-n1"]
[2013-08-06 10:59:57 CEST] chat: git ["--git-dir=/home/sam/Music/.git","--work-tree=/home/sam/Music","cat-file","--batch"]
[2013-08-06 10:59:57 CEST] read: git ["--git-dir=/home/sam/Music/.git","--work-tree=/home/sam/Music","ls-files","--stage","-z","--others","--exclude-standard","--","/home/sam/Music"]
[2013-08-06 10:59:57 CEST] chat: git ["--git-dir=/home/sam/Music/.git","--work-tree=/home/sam/Music","cat-file","--batch"]
(Recording state in git...)
[2013-08-06 11:00:16 CEST] feed: xargs ["-0","git","--git-dir=/home/sam/Music/.git","--work-tree=/home/sam/Music","add","-f"]
commit  
[2013-08-06 11:00:16 CEST] read: git ["--git-dir=/home/sam/Music/.git","--work-tree=/home/sam/Music","commit","-m","git-annex automatic sync"]
ok
[2013-08-06 11:00:17 CEST] call: git ["--git-dir=/home/sam/Music/.git","--work-tree=/home/sam/Music","show-ref","--verify","-q","refs/heads/synced/master"]
[2013-08-06 11:00:17 CEST] read: git ["--git-dir=/home/sam/Music/.git","--work-tree=/home/sam/Music","log","refs/heads/master..refs/heads/synced/master","--oneline","-n1"]
[2013-08-06 11:00:17 CEST] read: git ["--git-dir=/home/sam/Music/.git","--work-tree=/home/sam/Music","show-ref","git-annex"]
[2013-08-06 11:00:17 CEST] read: git ["--git-dir=/home/sam/Music/.git","--work-tree=/home/sam/Music","show-ref","--hash","refs/heads/git-annex"]
[2013-08-06 11:00:17 CEST] read: git ["--git-dir=/home/sam/Music/.git","--work-tree=/home/sam/Music","log","refs/heads/git-annex..ba060b7777413ab687d64771b5d6c2b36a072335","--oneline","-n1"]
[2013-08-06 11:00:17 CEST] read: git ["--git-dir=/home/sam/Music/.git","--work-tree=/home/sam/Music","log","refs/heads/git-annex..f401f2b7b67567862df7c5b8d304f52c3af43f4b","--oneline","-n1"]
[2013-08-06 11:00:17 CEST] read: git ["--git-dir=/home/sam/Music/.git","--work-tree=/home/sam/Music","log","refs/heads/git-annex..feaba7c5ea5f4ca73c123e6ea44ffd6333bf383e","--oneline","-n1"]
[2013-08-06 11:00:17 CEST] call: git ["--git-dir=/home/sam/Music/.git","--work-tree=/home/sam/Music","branch","-f","synced/master"]
"""]]

[[done]]