[PATCH 0/1] (Was: Fix a race in pid generation that causes pids tobe reused immediately.)

From: Oleg Nesterov
Date: Tue Jun 15 2010 - 14:37:26 EST

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.


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