linux-kernel - Re: BUG: wait_task_zombie NULL dereference

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Message-ID: <CAAmnkzkzCg8tR0k4VZRp_HPErE73ykFc7K8SpqEi7AU_6Dyk=g@mail.gmail.com>
Date:	Tue, 4 Dec 2012 06:03:09 -0800
From:	"Bill Huey (hui)" <bill.huey@...il.com>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Cc:	ebiederm@...ssion.com
Subject: Re: BUG: wait_task_zombie NULL dereference

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.

bill

On Tue, Dec 4, 2012 at 5:48 AM, Bill Huey (hui) <bill.huey@...il.com> wrote:
> I'm hitting this under a heavy scheduler test load with SCHED_RR tasks
> exiting normally after completion and the parent exiting with some of
> the pthreads still running:
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