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## What steps will reproduce the problem?
Take a large sub-directory in a repository (e.g. `ccash`) with some files within,
$ tar -xzf ccash.tar.gz
$ du -sh ccash
59M ccash
$ ls -l ccash/trunk/annotationinterface/src/edu/byu/nlp/annotationinterface/java/BasicAnnotation.java ccash/trunk/DataProvider/WebContent/WEB-INF/lib/dom4j.jar
-rw-r--r-- 1 dietz dietz 1748 Jul 27 2011 ccash/trunk/annotationinterface/src/edu/byu/nlp/annotationinterface/java/BasicAnnotation.java
-rw-r--r-- 1 dietz dietz 313898 May 22 18:36 ccash/trunk/DataProvider/WebContent/WEB-INF/lib/dom4j.jar
Annex it,
$ git annex add ccash
...
$ ls -l ccash/trunk/annotationinterface/src/edu/byu/nlp/annotationinterface/java/BasicAnnotation.java ccash/trunk/DataProvider/WebContent/WEB-INF/lib/dom4j.jar
lrwxrwxrwx 1 dietz dietz 215 Jul 27 2011 ccash/trunk/annotationinterface/src/edu/byu/nlp/annotationinterface/java/BasicAnnotation.java -> ../../../../../../../../../../../.git/annex/objects/mv/zf/SHA256-s1748--5c0d1cbf104214b6d0ab85c53a85cadb975ec208f42a7b33a76d85e175352486/SHA256-s1748--5c0d1cbf104214b6d0ab85c53a85cadb975ec208f42a7b33a76d85e175352486
lrwxrwxrwx 1 dietz dietz 210 Jul 27 2011 ccash/trunk/DataProvider/WebContent/WEB-INF/lib/dom4j.jar -> ../../../../../../../../.git/annex/objects/8G/gQ/SHA256-s313898--593552ffea3c5823c6602478b5002a7c525fd904a3c44f1abe4065c22edfac73/SHA256-s313898--593552ffea3c5823c6602478b5002a7c525fd904a3c44f1abe4065c22edfac73
Unannex it (before or after committing),
$ git annex unannex ccash
Note that some fraction of the files will still be symbolic links, now pointing to non-existent files. This data has apparently been lost forever.
$ ls -l ccash/trunk/annotationinterface/src/edu/byu/nlp/annotationinterface/java/BasicAnnotation.java ccash/trunk/DataProvider/WebContent/WEB-INF/lib/dom4j.jar
-rw-r--r-- 1 dietz dietz 1748 Jul 27 2011 ccash/trunk/annotationinterface/src/edu/byu/nlp/annotationinterface/java/BasicAnnotation.java
lrwxrwxrwx 1 dietz dietz 210 Jul 27 2011 ccash/trunk/DataProvider/WebContent/WEB-INF/lib/dom4j.jar -> ../../../../../../../../.git/annex/objects/8G/gQ/SHA256-s313898--593552ffea3c5823c6602478b5002a7c525fd904a3c44f1abe4065c22edfac73/SHA256-s313898--593552ffea3c5823c6602478b5002a7c525fd904a3c44f1abe4065c22edfac73
It is unclear why some files are affected while others are not. That being said, unannexing small numbers of files at a time appears to avoid the issue,
$ tar -zxf ccash.tar.gz
$ git annex add ccash
$ ls -l ccash/trunk/annotationinterface/src/edu/byu/nlp/annotationinterface/java/BasicAnnotation.java ccash/trunk/DataProvider/WebContent/WEB-INF/lib/dom4j.jar
lrwxrwxrwx 1 dietz dietz 215 Jul 27 2011 ccash/trunk/annotationinterface/src/edu/byu/nlp/annotationinterface/java/BasicAnnotation.java -> ../../../../../../../../../../../.git/annex/objects/mv/zf/SHA256-s1748--5c0d1cbf104214b6d0ab85c53a85cadb975ec208f42a7b33a76d85e175352486/SHA256-s1748--5c0d1cbf104214b6d0ab85c53a85cadb975ec208f42a7b33a76d85e175352486
lrwxrwxrwx 1 dietz dietz 210 Jul 27 2011 ccash/trunk/DataProvider/WebContent/WEB-INF/lib/dom4j.jar -> ../../../../../../../../.git/annex/objects/8G/gQ/SHA256-s313898--593552ffea3c5823c6602478b5002a7c525fd904a3c44f1abe4065c22edfac73/SHA256-s313898--593552ffea3c5823c6602478b5002a7c525fd904a3c44f1abe4065c22edfac73
$ git annex unannex ccash/trunk/DataProvider/WebContent/WEB-INF
...
$ ls -l ccash/trunk/annotationinterface/src/edu/byu/nlp/annotationinterface/java/BasicAnnotation.java ccash/trunk/DataProvider/WebContent/WEB-INF/lib/dom4j.jar
lrwxrwxrwx 1 dietz dietz 215 Jul 27 2011 ccash/trunk/annotationinterface/src/edu/byu/nlp/annotationinterface/java/BasicAnnotation.java -> ../../../../../../../../../../../.git/annex/objects/mv/zf/SHA256-s1748--5c0d1cbf104214b6d0ab85c53a85cadb975ec208f42a7b33a76d85e175352486/SHA256-s1748--5c0d1cbf104214b6d0ab85c53a85cadb975ec208f42a7b33a76d85e175352486
-rw-r--r-- 1 dietz dietz 313898 Jul 27 2011 ccash/trunk/DataProvider/WebContent/WEB-INF/lib/dom4j.jar
For this reason, it seems likely this is due to some sort of race condition.
## What version of git-annex are you using? On what operating system?
This is on Ubuntu 12.04 with git-annex revision a1e2bc4.
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