[Bug 1096771] Re: error 'No cgroup mounted on the system' but cgroup mounted

[Robert Collins]

exec 2>&1 1>/run/cgroup.debug
exec 2>&1 1>>/run/cgroup.debug
set -x


cgroup.debug during boot: (.1)
 cat /run/cgroup.debug.1
+ grep /sys/fs/cgroup /proc/mounts
+ [ -n  ]
+ grep -v ^# /etc/fstab
+ grep -q cgroup
+ grep -q cgroup /proc/mounts
+ [ ! -e /proc/cgroups ]
+ mount -t tmpfs -o uid=0,gid=0,mode=0755 cgroup /sys/fs/cgroup
+ sed -e 1d;s/\([^\t]\)\t.*$/\1/ /proc/cgroups
+ mkdir /sys/fs/cgroup/cpuset
+ mount -n -t cgroup -o cpuset cgroup /sys/fs/cgroup/cpuset
+ mkdir /sys/fs/cgroup/cpu
+ mount -n -t cgroup -o cpu cgroup /sys/fs/cgroup/cpu
+ mkdir /sys/fs/cgroup/cpuacct
+ mount -n -t cgroup -o cpuacct cgroup /sys/fs/cgroup/cpuacct
+ mkdir /sys/fs/cgroup/memory
+ mount -n -t cgroup -o memory cgroup /sys/fs/cgroup/memory
+ mkdir /sys/fs/cgroup/devices
+ mount -n -t cgroup -o devices cgroup /sys/fs/cgroup/devices
+ mkdir /sys/fs/cgroup/freezer
+ mount -n -t cgroup -o freezer cgroup /sys/fs/cgroup/freezer
+ mkdir /sys/fs/cgroup/blkio
+ mount -n -t cgroup -o blkio cgroup /sys/fs/cgroup/blkio
+ mkdir /sys/fs/cgroup/perf_event
+ mount -n -t cgroup -o perf_event cgroup /sys/fs/cgroup/perf_event
+ exit 0

And after boot:
cat /run/cgroup.debug
+ grep /sys/fs/cgroup /proc/mounts
+ [ -n  ]
+ + grep -v ^# /etc/fstab -q cgroup
+ grep -q cgroup /proc/mounts
+ [ ! -e /proc/cgroups ]
+ mount -t tmpfs -o uid=0,gid=0,mode=0755 cgroup /sys/fs/cgroup
+ sed -e 1d;s/\([^\t]\)\t.*$/\1/ /proc/cgroups
+ mkdir /sys/fs/cgroup/cpuset
+ mount -n -t cgroup -o cpuset cgroup /sys/fs/cgroup/cpuset
+ mkdir /sys/fs/cgroup/cpu
+ mount -n -t cgroup -o cpu cgroup /sys/fs/cgroup/cpu
+ mkdir /sys/fs/cgroup/cpuacct
+ mount -n -t cgroup -o cpuacct cgroup /sys/fs/cgroup/cpuacct
+ mkdir /sys/fs/cgroup/memory
+ mount -n -t cgroup -o memory cgroup /sys/fs/cgroup/memory
+ mkdir /sys/fs/cgroup/devices
+ mount -n -t cgroup -o devices cgroup /sys/fs/cgroup/devices
+ mkdir /sys/fs/cgroup/freezer
+ mount -n -t cgroup -o freezer cgroup /sys/fs/cgroup/freezer
+ mkdir /sys/fs/cgroup/blkio
+ mount -n -t cgroup -o blkio cgroup /sys/fs/cgroup/blkio
+ mkdir /sys/fs/cgroup/perf_event
+ mount -n -t cgroup -o perf_event cgroup /sys/fs/cgroup/perf_event
+ exit 0

And the diff:
$ diff -u /run/cgroup.debug{.1,}
--- /run/cgroup.debug.1 2013-01-08 09:25:32.756067804 +1300
+++ /run/cgroup.debug   2013-01-08 09:30:18.507748375 +1300
@@ -1,7 +1,6 @@
 + grep /sys/fs/cgroup /proc/mounts
 + [ -n  ]
-+ grep -v ^# /etc/fstab
-+ grep -q cgroup
++ + grep -v ^# /etc/fstab -q cgroup
 + grep -q cgroup /proc/mounts
 + [ ! -e /proc/cgroups ]
 + mount -t tmpfs -o uid=0,gid=0,mode=0755 cgroup /sys/fs/cgroup

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https://bugs.launchpad.net/bugs/1096771

Title:
  error 'No cgroup mounted on the system' but cgroup mounted

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