linux-kernel - Re: [GIT PULL] Please pull proc and exec work for 5.7-rc1

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Message-ID: <20200411182043.GA3136@redhat.com>
Date:   Sat, 11 Apr 2020 20:20:43 +0200
From:   Oleg Nesterov <oleg@...hat.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     "Eric W. Biederman" <ebiederm@...ssion.com>,
        Bernd Edlinger <bernd.edlinger@...mail.de>,
        Waiman Long <longman@...hat.com>,
        Ingo Molnar <mingo@...nel.org>, Will Deacon <will@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Alexey Gladkov <gladkov.alexey@...il.com>
Subject: Re: [GIT PULL] Please pull proc and exec work for 5.7-rc1

Eric, Linus, et al,

by various reasons I have not been reading emails for last weeks,
I'll try to read this thread tomorrow, currently I am a bit lost.

On 04/09, Linus Torvalds wrote:
>
>  (1) have execve() not wait for dead threads while holding the cred
> mutex

This is what I tried to do 3 years ago, see

	[PATCH 1/2] exec: don't wait for zombie threads with cred_guard_mutex held
	https://lore.kernel.org/lkml/20170213141516.GA30233@redhat.com/

yes, yes, yes, the patch is not pretty.

>From your another email:

>	/* if the parent is going through a execve(), it's not listening */
>	if (parent->signal->group_exit_task)
		return false;

Heh ;) see

	[PATCH 2/2] ptrace: ensure PTRACE_EVENT_EXIT won't stop if the tracee is killed by exec
	https://lore.kernel.org/lkml/20170213141519.GA30239@redhat.com/

from the same thread.

But this change is more problematic. 

Oleg.