### Please describe the problem.

4 out of 269 tests failed (4468.00s)

hard to assess how critical they are... 

### What steps will reproduce the problem?

run git annex test

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

6.20160307+gitgb095561-1~ndall+1

### Please provide any additional information below.

[Full log](http://www.onerussian.com/tmp/git-annex-tests-6.20160307+gitgb095561-1~ndall+1.log)

[[!format sh """
smaug:/mnt/nfs/scrap/datalad/test_annex
$> grep -B5 FAIL git-annex-tests-6.20160307+gitgb095561-1~ndall+1.log
    crypto:                                               OK (50.57s)
    preferred content:                                    OK (20.36s)
    add subdirs:                                          OK (8.97s)
    addurl:                                               .t/tmprepo73/.git/annex/keys: removeDirectoryRecursive: unsatisfied constraints (Directory not empty)
sleeping 10 seconds and will retry directory cleanup
FAIL
--
   293ed4c..c16b350  git-annex -> synced/git-annex
   dd272eb..ffe1721  master -> synced/master
OK (11.64s)
    addurl:                                               .t/tmprepo73/.git/annex/keys/.nfs0000000009a305870000020e: removeDirectoryRecursive: resource busy (Device or resource busy)
sleeping 10 seconds and will retry directory cleanup
FAIL
--
   0993b09..c09ddc4  git-annex -> synced/git-annex
   a823824..520f58c  master -> synced/master
OK (13.67s)
    addurl:                                               .t/tmprepo73/.git/annex/keys/.nfs0000000009a305870000020e: removeDirectoryRecursive: resource busy (Device or resource busy)
sleeping 10 seconds and will retry directory cleanup
FAIL
--
OK (14.59s)
    addurl:                                               On branch master
nothing to commit, working directory clean
.t/tmprepo73/.git/annex/keys/.nfs0000000009a305870000020e: removeDirectoryRecursive: resource busy (Device or resource busy)
sleeping 10 seconds and will retry directory cleanup
FAIL


# End of transcript or log.
"""]]

[[!meta author=yoh]]