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Re: [PATCH] avoid race condition in pick_next_task_fair in kernel/sched_fair.c

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From: Peter Zijlstra
Subject: Re: [PATCH] avoid race condition in pick_next_task_fair in kernel/sched_fair.c
Date: Thursday, December 23, 2010 - 5:33 am

On Thu, 2010-12-23 at 13:12 +0100, Peter Zijlstra wrote:

 systemd-1       0d..1. 2070793us : sched_destroy_group: se: f69e43c0, load: 1024
 systemd-1       0d..1. 2070794us : sched_destroy_group: cfs_rq: f69e4720, nr: 1, load: 1024
 systemd-1       0d..1. 2070794us : __print_runqueue:  cfs_rq: f69e4720, nr: 1, load: 1024
 systemd-1       0d..1. 2070795us : __print_runqueue:  curr: (null)
 systemd-1       0d..1. 2070796us : __print_runqueue:  se: f6a8eb4c, comm: systemd-tmpfile/1243, load: 1024
 systemd-1       0d..1. 2070796us : _raw_spin_unlock_irqrestore <-sched_destroy_group

So somehow it manages to destroy a group with a task attached.
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Re: [PATCH] avoid race condition in pick_next_task_fair in ..., Peter Zijlstra, (Tue Jun 29, 3:43 am)
Re: [PATCH] avoid race condition in pick_next_task_fair in ..., shenghui, (Tue Jun 29, 4:24 am)
Re: [PATCH] avoid race condition in pick_next_task_fair in ..., Peter Zijlstra, (Tue Jun 29, 4:35 am)
Re: [PATCH] avoid race condition in pick_next_task_fair in ..., Miklos Vajna, (Sat Dec 18, 7:03 pm)
Re: [PATCH] avoid race condition in pick_next_task_fair in ..., Miklos Vajna, (Tue Dec 21, 5:22 pm)
Re: [PATCH] avoid race condition in pick_next_task_fair in ..., Peter Zijlstra, (Wed Dec 22, 1:29 am)
Re: [PATCH] avoid race condition in pick_next_task_fair in ..., Peter Zijlstra, (Wed Dec 22, 1:41 am)
Re: [PATCH] avoid race condition in pick_next_task_fair in ..., Mike Galbraith, (Wed Dec 22, 1:41 am)
Re: [PATCH] avoid race condition in pick_next_task_fair in ..., Peter Zijlstra, (Wed Dec 22, 2:07 am)
Re: [PATCH] avoid race condition in pick_next_task_fair in ..., Miklos Vajna, (Wed Dec 22, 6:31 am)
Re: [PATCH] avoid race condition in pick_next_task_fair in ..., Peter Zijlstra, (Wed Dec 22, 7:00 am)
Re: [PATCH] avoid race condition in pick_next_task_fair in ..., Peter Zijlstra, (Wed Dec 22, 7:11 am)
Re: [PATCH] avoid race condition in pick_next_task_fair in ..., Miklos Vajna, (Wed Dec 22, 8:14 am)
Re: [PATCH] avoid race condition in pick_next_task_fair in ..., Peter Zijlstra, (Wed Dec 22, 10:08 am)
Re: [PATCH] avoid race condition in pick_next_task_fair in ..., Ingo Molnar, (Wed Dec 22, 10:16 am)
Re: [PATCH] avoid race condition in pick_next_task_fair in ..., Miklos Vajna, (Wed Dec 22, 2:11 pm)
Re: [PATCH] avoid race condition in pick_next_task_fair in ..., Miklos Vajna, (Wed Dec 22, 4:39 pm)
Re: [PATCH] avoid race condition in pick_next_task_fair in ..., Yong Zhang, (Wed Dec 22, 7:08 pm)
Re: [PATCH] avoid race condition in pick_next_task_fair in ..., Peter Zijlstra, (Thu Dec 23, 5:12 am)
Re: [PATCH] avoid race condition in pick_next_task_fair in ..., Peter Zijlstra, (Thu Dec 23, 5:33 am)
Re: [PATCH] avoid race condition in pick_next_task_fair in ..., Peter Zijlstra, (Thu Dec 23, 11:24 am)
[PATCH] sched, cgroup: Use exit hook to avoid use-after-fr ..., Peter Zijlstra, (Fri Dec 24, 8:59 am)
Re: [PATCH] sched, cgroup: Use exit hook to avoid use-afte ..., Miklos Vajna, (Fri Dec 24, 9:40 am)
Re: [PATCH] sched, cgroup: Use exit hook to avoid use-afte ..., Mike Galbraith, (Fri Dec 24, 9:48 am)
Re: [PATCH] sched, cgroup: Use exit hook to avoid use-afte ..., Peter Zijlstra, (Fri Dec 24, 10:07 am)
Re: [PATCH] sched, cgroup: Use exit hook to avoid use-afte ..., Mike Galbraith, (Fri Dec 24, 10:24 am)
Re: [PATCH] sched, cgroup: Use exit hook to avoid use-afte ..., Balbir Singh, (Sat Dec 25, 10:55 am)
Re: [PATCH] sched, cgroup: Use exit hook to avoid use-afte ..., Paul Menage, (Sat Dec 25, 1:59 pm)
Re: [PATCH] sched, cgroup: Use exit hook to avoid use-afte ..., Ingo Molnar, (Wed Dec 29, 8:25 am)
Re: [PATCH] sched, cgroup: Use exit hook to avoid use-afte ..., Miklos Vajna, (Wed Dec 29, 4:07 pm)
[PATCH] Re: [PATCH] sched, cgroup: Use exit hook to avoid ..., Mike Galbraith, (Fri Dec 31, 1:32 am)
Re: [PATCH] sched, cgroup: Use exit hook to avoid use-afte ..., Mike Galbraith, (Fri Dec 31, 3:04 am)
Re: [PATCH] sched, cgroup: Use exit hook to avoid use-afte ..., Peter Zijlstra, (Mon Jan 3, 12:06 am)
Re: [PATCH] Re: [PATCH] sched, cgroup: Use exit hook to av ..., Peter Zijlstra, (Mon Jan 3, 1:21 am)
[tip:sched/core] sched, autogroup: Fix reference leak, tip-bot for Mike Gal ..., (Tue Jan 4, 7:19 am)
Re: [tip:sched/core] sched, autogroup: Fix reference leak, Oleg Nesterov, (Tue Jan 4, 7:57 am)
Re: [tip:sched/core] sched, autogroup: Fix reference leak, Mike Galbraith, (Tue Jan 4, 12:06 pm)