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

[Oleg Nesterov]

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@xxxxxxxxxx/

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@xxxxxxxxxx/

from the same thread.

But this change is more problematic. 

Oleg.