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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <200812091548.mB9Fm0sm011959@d01av04.pok.ibm.com>
Date:	Tue, 09 Dec 2008 08:47:00 -0600
From:	Brian King <brking@...ux.vnet.ibm.com>
To:	mingo@...e.hu
Cc:	a.p.zijlstra@...llo.nl, efault@....de, vatsa@...ibm.com,
	balbir@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org,
	brking@...ux.vnet.ibm.com
Subject: [PATCH 1/1] sched: CPU remove deadlock fix


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;
_
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/