[Bug 1522650] [NEW] the user namespace in ubuntu 15.04 can not run correctly

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Following this guide

http://manpages.ubuntu.com/manpages/wily/man7/user_namespaces.7.html


And run this program on ubuntu 15.04, it would have exception

System information as following:


Linux 3.19.0-30-generic
ubuntu at testtmp:~$ id -u
1000
ubuntu at testtmp:~$ id -g
1000
ubuntu at testtmp:~$ ./userns_child_exec -p -m -U -M '0 1000 1' -G '0 1000 1' bash
ERROR: write /proc/5629/gid_map: Operation not permitted
About to exec bash
ubuntu at testtmp:~$ root at testtmp:~#

** Affects: coreutils (Ubuntu)
     Importance: Undecided
         Status: Incomplete


** Tags: bot-comment
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the user namespace in ubuntu 15.04 can not run correctly
https://bugs.launchpad.net/bugs/1522650
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