linux-kernel - [PATCH 0/1] Revert "kmod: handle UMH_WAIT

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Message-ID: <20151014185153.GA8117@redhat.com>
Date:	Wed, 14 Oct 2015 20:51:53 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Rik van Riel <riel@...hat.com>,
	Christoph Lameter <cl@...ux.com>, Tejun Heo <tj@...nel.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 0/1] Revert "kmod: handle UMH_WAIT_PROC from system unbound
	workqueue"

Hello,

I noticed by accident the kworker zombies on my testing machine.
Can't reproduce (although I think it won't be hard to make a
test-case), but I think the reason is clear, see the changelog.

We could fix this by using kthread_create() if !UMH_WAIT_PROC,
but imo it would be better to revert this change at least for
now. If we really want to avoid the extra kernel_thread(), we
can make another patch which also avoids sys_wait4() and the
games with SIGCHLD; we can rely on wait_chldexit.

Oleg.

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