On 10/16, Tejun Heo wrote:

cgroup_freezer doesn't transition from FREEZING to FROZEN if the
cgroup contains PF_NOFREEZE tasks or tasks sleeping with
PF_FREEZER_SKIP set.

And thus the patch looks like another bugfix to me.


Just one question, and this question is offtopic again,

Only kernel tasks can be non-freezable (PF_NOFREEZE)

Hmm. We seem to "leak" PF_NOFREEZE if a kernel thread execs?
Perhaps do_execve_common() should do set_freezable() before return.

Or, at least, simply clear this flag along with PF_KTHREAD in
flush_old_exec().

Oleg.