Re: [PATCH 00/16] ptrace: cleanups and calling do_cldstop with only siglock

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To: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
Subject: Re: [PATCH 00/16] ptrace: cleanups and calling do_cldstop with only siglock
From: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
Date: Fri, 20 May 2022 11:19:02 +0200
Cc: linux-kernel@xxxxxxxxxxxxxxx, rjw@xxxxxxxxxxxxx, oleg@xxxxxxxxxx, mingo@xxxxxxxxxx, vincent.guittot@xxxxxxxxxx, dietmar.eggemann@xxxxxxx, rostedt@xxxxxxxxxxx, mgorman@xxxxxxx, Will Deacon <will@xxxxxxxxxx>, tj@xxxxxxxxxx, linux-pm@xxxxxxxxxxxxxxx, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Richard Weinberger <richard@xxxxxx>, Anton Ivanov <anton.ivanov@xxxxxxxxxxxxxxxxxx>, Johannes Berg <johannes@xxxxxxxxxxxxxxxx>, linux-um@xxxxxxxxxxxxxxxxxxx, Chris Zankel <chris@xxxxxxxxxx>, Max Filippov <jcmvbkbc@xxxxxxxxx>, linux-xtensa@xxxxxxxxxxxxxxxx, Jann Horn <jannh@xxxxxxxxxx>, Kees Cook <keescook@xxxxxxxxxxxx>, linux-ia64@xxxxxxxxxxxxxxx, "Robert O'Callahan" <roc@xxxxxxxxx>, Kyle Huey <khuey@xxxxxxxxx>, Richard Henderson <rth@xxxxxxxxxxxxxxx>, Ivan Kokshaysky <ink@xxxxxxxxxxxxxxxxxxxx>, Matt Turner <mattst88@xxxxxxxxx>, Jason Wessel <jason.wessel@xxxxxxxxxxxxx>, Daniel Thompson <daniel.thompson@xxxxxxxxxx>, Douglas Anderson <dianders@xxxxxxxxxxxx>, Douglas Miller <dougmill@xxxxxxxxxxxxxxxxxx>, Michael Ellerman <mpe@xxxxxxxxxxxxxx>, Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>, Paul Mackerras <paulus@xxxxxxxxx>
In-reply-to: <871qwq5ucx.fsf_-_@email.froward.int.ebiederm.org>
References: <20220421150248.667412396@infradead.org> <20220421150654.817117821@infradead.org> <87czhap9dy.fsf@email.froward.int.ebiederm.org> <878rrrh32q.fsf_-_@email.froward.int.ebiederm.org> <87k0b7v9yk.fsf_-_@email.froward.int.ebiederm.org> <87k0b0apne.fsf_-_@email.froward.int.ebiederm.org> <87a6bv6dl6.fsf_-_@email.froward.int.ebiederm.org> <871qwq5ucx.fsf_-_@email.froward.int.ebiederm.org>

On 2022-05-18 17:49:50 [-0500], Eric W. Biederman wrote:
> After this set of changes only cgroup_enter_frozen should remain a
> stumbling block for PREEMPT_RT in the ptrace_stop path.

Yes, I can confirm that. I have no systemd-less system at hand which
means I can't boot a kernel without CGROUP support. But after removing
cgroup_{enter|leave}_frozen() in ptrace_stop() I don't see the problems
I saw earlier.

Sebastian

References:
- [PATCH 0/12] ptrace: cleaning up ptrace_stop
  - From: Eric W. Biederman
- [PATCH v3 0/11] ptrace: cleaning up ptrace_stop
  - From: Eric W. Biederman
- [PATCH v4 0/12] ptrace: cleaning up ptrace_stop
  - From: Eric W. Biederman
- [PATCH 00/16] ptrace: cleanups and calling do_cldstop with only siglock
  - From: Eric W. Biederman

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