[Bug 1516971] Re: LXC's preserve_ns fails on < 3.8 kernels

[Stéphane Graber]

** Description changed:

+ == SRU ==
+ Rationale: LXC no longer starts on kernels > 3.2 and < 3.8
+ Test case: Try starting an LXC container on an affected kernel
+ Regression potential: Can't really get any worse. Change has been reviewed and tested upstream.
+ 
+ == Original bug report ==
  ubuntu-touch/devel-proposed/mako 350
  
  After flashing the device the boot hangs on the vendor logo.
  There is no crash file on the device but it seems that the android container fails to start.
  
- There is the following error in syslog 
+ There is the following error in syslog
  Nov 17 08:33:15 ubuntu-phablet kernel: [    8.694826] init: lxc-android-config main process (918) terminated with status 255
  
  and in upstart/android.log:
-       lxc-start 1447749195.286 ERROR    lxc_start - start.c:preserve_ns:149 - No such file or directory - failed to open '/proc/1055/ns/mnt'
-       lxc-start 1447749195.286 ERROR    lxc_start - start.c:lxc_spawn:993 - failed to store namespace references
-       lxc-start 1447749195.408 ERROR    lxc_start - start.c:__lxc_start:1192 - failed to spawn 'android'
-       lxc-start 1447749195.758 ERROR    lxc_start_ui - lxc_start.c:main:344 - The container failed to start.
-       lxc-start 1447749195.758 ERROR    lxc_start_ui - lxc_start.c:main:348 - Additional information can be obtained by setting the --logfile and --logpriority options.
+       lxc-start 1447749195.286 ERROR    lxc_start - start.c:preserve_ns:149 - No such file or directory - failed to open '/proc/1055/ns/mnt'
+       lxc-start 1447749195.286 ERROR    lxc_start - start.c:lxc_spawn:993 - failed to store namespace references
+       lxc-start 1447749195.408 ERROR    lxc_start - start.c:__lxc_start:1192 - failed to spawn 'android'
+       lxc-start 1447749195.758 ERROR    lxc_start_ui - lxc_start.c:main:344 - The container failed to start.
+       lxc-start 1447749195.758 ERROR    lxc_start_ui - lxc_start.c:main:348 - Additional information can be obtained by setting the --logfile and --logpriority options.

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https://bugs.launchpad.net/bugs/1516971

Title:
  LXC's preserve_ns fails on < 3.8 kernels

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