linux-kernel - Re: [PATCH 1/1] sched: CPU remove deadlock fix

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Date:	Tue, 9 Dec 2008 19:12:36 +0100
From:	Heiko Carstens <heiko.carstens@...ibm.com>
To:	Brian King <brking@...ux.vnet.ibm.com>
Cc:	mingo@...e.hu, a.p.zijlstra@...llo.nl, efault@....de,
	vatsa@...ibm.com, balbir@...ux.vnet.ibm.com,
	linux-kernel@...r.kernel.org, Nick Piggin <npiggin@...e.de>
Subject: Re: [PATCH 1/1] sched: CPU remove deadlock fix

On Tue, Dec 09, 2008 at 08:47:00AM -0600, Brian King wrote:
> 
> This patch fixes a possible deadlock scenario in the CPU remove path.
> migration_call grabs rq->lock, then wakes up everything on rq->migration_queue
> with the lock held. Then one of the tasks on the migration queue ends up
> calling tg_shares_up which then also tries to acquire the same rq->lock.
> 
> [c000000058eab2e0] c000000000502078 ._spin_lock_irqsave+0x98/0xf0
> [c000000058eab370] c00000000008011c .tg_shares_up+0x10c/0x20c
> [c000000058eab430] c00000000007867c .walk_tg_tree+0xc4/0xfc
> [c000000058eab4d0] c0000000000840c8 .try_to_wake_up+0xb0/0x3c4
> [c000000058eab590] c0000000000799a0 .__wake_up_common+0x6c/0xe0
> [c000000058eab640] c00000000007ada4 .complete+0x54/0x80
> [c000000058eab6e0] c000000000509fa8 .migration_call+0x5fc/0x6f8
> [c000000058eab7c0] c000000000504074 .notifier_call_chain+0x68/0xe0
> [c000000058eab860] c000000000506568 ._cpu_down+0x2b0/0x3f4
> [c000000058eaba60] c000000000506750 .cpu_down+0xa4/0x108
> [c000000058eabb10] c000000000507e54 .store_online+0x44/0xa8
> [c000000058eabba0] c000000000396260 .sysdev_store+0x3c/0x50
> [c000000058eabc10] c0000000001a39b8 .sysfs_write_file+0x124/0x18c
> [c000000058eabcd0] c00000000013061c .vfs_write+0xd0/0x1bc
> [c000000058eabd70] c0000000001308a4 .sys_write+0x68/0x114
> [c000000058eabe30] c0000000000086b4 syscall_exit+0x0/0x40
> 
> Signed-off-by: Brian King <brking@...ux.vnet.ibm.com>
> ---
> 
>  kernel/sched.c |    2 ++
>  1 file changed, 2 insertions(+)
> 
> diff -puN kernel/sched.c~sched_cpu_down_deadlock_fix kernel/sched.c
> --- linux-2.6/kernel/sched.c~sched_cpu_down_deadlock_fix	2008-12-09 08:42:09.000000000 -0600
> +++ linux-2.6-bjking1/kernel/sched.c	2008-12-09 08:42:09.000000000 -0600
> @@ -6587,7 +6587,9 @@ migration_call(struct notifier_block *nf
>  			req = list_entry(rq->migration_queue.next,
>  					 struct migration_req, list);
>  			list_del_init(&req->list);
> +			spin_unlock_irq(&rq->lock);
>  			complete(&req->done);
> +			spin_lock_irq(&rq->lock);
>  		}
>  		spin_unlock_irq(&rq->lock);
>  		break;

I've seen the same deadlock on s390 and had a similar fix, but
no testing yet. Thanks for the fix! :)

Will this be in 2.6.28?
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