Re: [PATCH v2 3/6] cgroup: cgroup v2 freezer

Oleg Nesterov
2018-11-14T17:36:16Z

On 11/14, Roman Gushchin wrote:
>
> > No, this is very wrong. Just suppose the caller is killed right before
> > clear_thread_flag(TIF_SIGPENDING).
>
> So, I had TASK_KILLABLE before, but had some issues with ptrace/gdb.
> I'll revisit this option.

Yes, ptrace_signal_wake_up() won't wake a TASK_KILLABLE tracee up...

BTW. Could you explain in the changelog how should a frozen task interact
with ptrace? 0/6 says "ptrace works" but that is all. It is not clear to me
what do we actually want wrt ptrace...

Oleg.