linux-kernel - Re: [PATCH v2 3/6] cgroup: cgroup v2 freezer

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Message-ID: <20181114173610.GF13885@redhat.com>
Date:   Wed, 14 Nov 2018 18:36:11 +0100
From:   Oleg Nesterov <oleg@...hat.com>
To:     Roman Gushchin <guro@...com>
Cc:     Roman Gushchin <guroan@...il.com>, Tejun Heo <tj@...nel.org>,
        "cgroups@...r.kernel.org" <cgroups@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Kernel Team <Kernel-team@...com>
Subject: Re: [PATCH v2 3/6] cgroup: cgroup v2 freezer

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.