linux-kernel - Re: BUG: wait_task_zombie NULL dereference

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Date:	Tue, 04 Dec 2012 11:20:25 -0800
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	"Bill Huey \(hui\)" <bill.huey@...il.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: BUG: wait_task_zombie NULL dereference

"Bill Huey (hui)" <bill.huey@...il.com> writes:

> I should add that I encountered this on 3.6.0 with some mild
> modifications to the scheduler path that enqueue/dequeue a task before
> any of the schedule exit logic gets hit. The SCHED_FF/FIFO rebalancer
> does much the same so I can't imagine that being the source of the
> problem.
>
> I could be wrong however.

In 3.6 from_kuid_munged should be only be expanded to the inline noop
version.

The code you quote does not exist in kernel/exit.c in wait_task_zombie
and has not existed in wait_task_zombie in Linus's tree.  So since I
can't see the code I can't help.

I suspect the bug relates to your local modifications.

Eric
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