Note that this doesn't happen on linux-next, whose HEAD is,
commit e98f2ba41687651055312e0ae617604dd6f7f200
Author: Stephen Rothwell <s...@canb.auug.org.au>
Date: Wed Jun 1 13:08:58 2016 +1000
Add linux-next specific files for 20160601
Signed-off-by: Stephen Rothwell <s...@canb.auug.org.au>
right now.
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/1588056
Title:
cgroupfs mounts can hang
Status in linux package in Ubuntu:
Confirmed
Bug description:
Consider the following,
root@dev:/tmp# mkdir foo
root@dev:/tmp# mount -t cgroup -o none,name=foo none foo
root@dev:/tmp# mkdir -p foo/bad
root@dev:/tmp# umount -l foo
root@dev:/tmp# mount -t cgroup -o none,name=foo none foo # hangs forever
^C
root@dev:/tmp# uname -a
Linux dev 4.4.0-22-generic #40-Ubuntu SMP Thu May 12 22:03:46 UTC 2016 x86_64
x86_64 x86_64 GNU/Linux
When I strace the mount task, I get a whole bunch of,
mount("none", "/tmp/foo", "cgroup", MS_MGC_VAL, "none,name=foo") = ?
ERESTARTNOINTR (To be restarted)
mount("none", "/tmp/foo", "cgroup", MS_MGC_VAL, "none,name=foo") = ?
ERESTARTNOINTR (To be restarted)
mount("none", "/tmp/foo", "cgroup", MS_MGC_VAL, "none,name=foo") = ?
ERESTARTNOINTR (To be restarted)
mount("none", "/tmp/foo", "cgroup", MS_MGC_VAL, "none,name=foo") = ?
ERESTARTNOINTR (To be restarted)
mount("none", "/tmp/foo", "cgroup", MS_MGC_VAL, "none,name=foo") = ?
ERESTARTNOINTR (To be restarted)
mount("none", "/tmp/foo", "cgroup", MS_MGC_VAL, "none,name=foo") = ?
ERESTARTNOINTR (To be restarted)
mount("none", "/tmp/foo", "cgroup", MS_MGC_VAL, "none,name=foo") = ?
ERESTARTNOINTR (To be restarted)
mount("none", "/tmp/foo", "cgroup", MS_MGC_VAL, "none,name=foo") = ?
ERESTARTNOINTR (To be restarted)
mount("none", "/tmp/foo", "cgroup", MS_MGC_VAL, "none,name=foo") = ?
ERESTARTNOINTR (To be restarted)
mount("none", "/tmp/foo", "cgroup", MS_MGC_VAL, "none,name=foo") = ?
ERESTARTNOINTR (To be restarted)
mount("none", "/tmp/foo", "cgroup", MS_MGC_VAL, "none,name=foo") = ?
ERESTARTNOINTR (To be restarted)
mount("none", "/tmp/foo", "cgroup", MS_MGC_VAL, "none,name=foo") = ?
ERESTARTNOINTR (To be restarted)
mount("none", "/tmp/foo", "cgroup", MS_MGC_VAL, "none,name=foo") = ?
ERESTARTNOINTR (To be restarted)
mount("none", "/tmp/foo", "cgroup", MS_MGC_VAL, "none,name=foo") = ?
ERESTARTNOINTR (To be restarted)
mount("none", "/tmp/foo", "cgroup", MS_MGC_VAL, "none,name=foo") = ?
ERESTARTNOINTR (To be restarted)
mount("none", "/tmp/foo", "cgroup", MS_MGC_VAL, "none,name=foo") = ?
ERESTARTNOINTR (To be restarted)
mount("none", "/tmp/foo", "cgroup", MS_MGC_VAL, "none,name=foo") = ?
ERESTARTNOINTR (To be restarted)
Which I think means that we're looping on,
https://github.com/torvalds/linux/blob/master/kernel/cgroup.c#L2137
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