Public bug reported:

Probably because of the old kernel version, a test fails like this:

/ns/sc_init_ns_group: OK
/ns/sc_lock_unlock_ns_mutex: OK
ERROR:ns-support-test.c:323:test_nsfs_fs_id: assertion failed (buf.f_type == 
NSFS_MAGIC): (40864 == 1853056627)
/ns/nsfs_fs_id: FAIL

12:44 < mwhudson> 40864 seems to be PROC_SUPER_MAGIC
12:44 < mwhudson> zyga:
12:44 < zyga> mwhudson: thanks
12:45 < mwhudson> and NSFS_MAGIC was only added to the kernel in a commit from 
Sat Nov 1 10:57:28 2014 -0400
12:45 < mwhudson> so that's not going to be in the 14.04 release kernel
12:46 < mwhudson> 3.19+
12:46 < zyga> mwhudson: so even the kernel headers have that macro, the 
relevant files in the kernel don't use it?
12:47 < mwhudson> zyga: well the kernel headers you are building against are 
from yakkety presumably
12:47 < zyga> mwhudson: yes, I just checked that :/
12:47 < zyga> mwhudson: the mount namespace file in the kernel is indeed procfs
12:47 < zyga> mwhudson: I guess this test needs to be skipped
12:47 < zyga> mwhudson: and we might need a separate check for this in 
snap-confine proper
12:48 < zyga> so that if we open and see PROC_SUPER_MAGIC we can die()

** Affects: snap-confine
     Importance: Undecided
         Status: In Progress

** Affects: snap-confine (Ubuntu)
     Importance: Undecided
         Status: In Progress

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  1.0.41-0ubuntu1 ftbfs on amd64, i386

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