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-rw-r--r--open_issues/procfs_umount.mdwn24
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+[[!meta copyright="Copyright © 2014 Free Software Foundation, Inc."]]
+
+[[!meta license="""[[!toggle id="license" text="GFDL 1.2+"]][[!toggleable
+id="license" text="Permission is granted to copy, distribute and/or modify this
+document under the terms of the GNU Free Documentation License, Version 1.2 or
+any later version published by the Free Software Foundation; with no Invariant
+Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license
+is included in the section entitled [[GNU Free Documentation
+License|/fdl]]."]]"""]]
+
+[[!tag open_issue_hurd]]
+
+As soon as one has accessed /proc/mounts, /proc can't be umount:
+
+ # settrans -ga /proc
+ settrans: /proc: Device or resource busy
+
+This is because mtab is still mounted on /proc/mounts:
+
+ # settrans -ga /proc/mounts
+ # settrans -ga /proc
+
+settrans -R is supposed to be doing this, but unfortunately this is not
+implemented yet in libnetfs, see #ifdef NOTYET in netfs_shutdown.