linux-kernel - [PATCH 0/1] (Was: Fix a race in pid generation that causes pids to be reused immediately.)

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Message-ID: <20100615183525.GA24577@redhat.com>
Date:	Tue, 15 Jun 2010 20:35:25 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Salman <sqazi@...gle.com>
Cc:	mingo@...e.hu, linux-kernel@...r.kernel.org, peterz@...radead.org,
	tytso@...gle.com, torvalds@...ux-foundation.org, walken@...gle.com
Subject: [PATCH 0/1] (Was: Fix a race in pid generation that causes pids to
	be reused immediately.)

On 06/11, Salman wrote:
>
> A program that repeatedly forks and waits is susceptible to having the
> same pid repeated,

I agree this patch should fix this.

But the kernel still can use the same pid twice in a row, I am wondering
if there a simple solution to prevent this. Probably not, and this case
is unlikely.

While we are here, and given that many reviewers recently inspected
alloc_pidmap(), probably someone can explain the mysterious checks
in do/while loop ?

See the patch I am going to send, it is on top on Salman's fix but doesn't
really depend on it.

Oleg.

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