From: Andi Kleen <andi@firstfloor.org>
To: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: Andi Kleen <andi@firstfloor.org>,
mingo@elte.hu, linux-kernel@vger.kernel.org, rjw@sisk.pl,
dipankar@in.ibm.com, tglx@linuxtronix.de
Subject: Re: RCU hang on cpu re-hotplug with 2.6.27rc8
Date: Tue, 7 Oct 2008 09:15:44 +0200 [thread overview]
Message-ID: <20081007071544.GC20740@one.firstfloor.org> (raw)
In-Reply-To: <20081007030822.GC6820@linux.vnet.ibm.com>
> Could you please try the patch at the following URL (from Thomas
> Gleixner)?
>
> http://www.rdrop.com/users/paulmck/patches/2.6.27-rc7-tglx-timer-1.patch
>
> This fixed some CPU hotplug hangs that I was seeing in 2.6.27-rc7 and
> -rc8. Alternatively, try 2.6.27-rc9, which seems to include Thomas's
> patch.
Still happens with rc9. This time with frame pointers:
bash D 00000000ffff975e 0 4770 4757
ffff8804bcda3bf8 0000000000000082 ffff8804bcda3c18 0000000000000296
ffff8804bde4e6b0 ffff8804be6fc630 ffff8804bde4e8f8 0000000e00000296
ffff8804bcda3c18 ffffffff808cfd98 ffff880288064780 ffff88027d18ec98
Call Trace:
[<ffffffff805c4915>] schedule_timeout+0x22/0xb4
[<ffffffff8020a009>] ? __switch_to+0x320/0x330
[<ffffffff802602ed>] ? cpupri_set+0xc5/0xd8
[<ffffffff805c476f>] wait_for_common+0xcd/0x131
[<ffffffff8022db87>] ? default_wake_function+0x0/0xf
[<ffffffff805c485d>] wait_for_completion+0x18/0x1a
[<ffffffff80243fbf>] synchronize_rcu+0x35/0x3c
[<ffffffff8024403e>] ? wakeme_after_rcu+0x0/0x12
[<ffffffff8022ed25>] partition_sched_domains+0x9b/0x1dd
[<ffffffff8022dbb3>] ? wake_up_process+0x10/0x12
[<ffffffff8022ee95>] update_sched_domains+0x2e/0x35
[<ffffffff805c8342>] notifier_call_chain+0x33/0x5b
[<ffffffff80249291>] __raw_notifier_call_chain+0x9/0xb
[<ffffffff802492a2>] raw_notifier_call_chain+0xf/0x11
[<ffffffff805c1c3a>] _cpu_up+0xd3/0x10c
[<ffffffff805c1cca>] cpu_up+0x57/0x67
[<ffffffff805a5787>] store_online+0x4d/0x75
[<ffffffff803e67bb>] sysdev_store+0x1b/0x1d
[<ffffffff802cce10>] sysfs_write_file+0xe0/0x11c
[<ffffffff8028b661>] vfs_write+0xae/0x137
[<ffffffff8028bb0a>] sys_write+0x47/0x6f
[<ffffffff8020b34b>] system_call_fastpath+0x16/0x1b
BTW it also happens reliably every time. Reproduced it three times
now. I just do
laut:~ # echo 0 > /sys/devices/system/cpu/cpu15/online
laut:~ # echo 0 > /sys/devices/system/cpu/cpu14/online
laut:~ # echo 1 > /sys/devices/system/cpu/cpu14/online
laut:~ # echo 1 > /sys/devices/system/cpu/cpu15/online
<hang>
-Andi
next prev parent reply other threads:[~2008-10-07 7:09 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-06 14:12 scheduler " Andi Kleen
2008-10-06 23:28 ` RCU " Andi Kleen
2008-10-07 3:08 ` Paul E. McKenney
2008-10-07 7:15 ` Andi Kleen [this message]
2008-10-07 15:26 ` Paul E. McKenney
2008-10-07 15:49 ` Andi Kleen
2008-10-07 16:34 ` Paul E. McKenney
2008-10-07 21:09 ` Andi Kleen
2008-10-07 21:22 ` Paul E. McKenney
2008-10-09 1:08 ` [PATCH] rudimentary tracing for Classic RCU Paul E. McKenney
2008-10-09 6:20 ` Lai Jiangshan
2008-10-09 6:55 ` Andi Kleen
2008-10-09 7:05 ` Lai Jiangshan
2008-10-09 7:14 ` KOSAKI Motohiro
2008-10-09 7:26 ` Lai Jiangshan
2008-10-09 8:06 ` Andi Kleen
2008-10-10 11:48 ` Paul E. McKenney
2008-10-09 11:50 ` Paul E. McKenney
2008-10-09 11:50 ` Paul E. McKenney
2008-10-09 10:23 ` Frédéric Weisbecker
2008-10-09 10:53 ` Andi Kleen
2008-10-09 11:44 ` Frédéric Weisbecker
2008-10-09 11:54 ` Paul E. McKenney
2008-10-09 13:01 ` Frédéric Weisbecker
2008-10-10 3:44 ` [PATCH] v2 " Paul E. McKenney
2008-10-13 23:09 ` [PATCH] v3 " Paul E. McKenney
2008-10-14 3:53 ` Lai Jiangshan
2008-10-14 14:35 ` Paul E. McKenney
2008-10-23 11:12 ` Lai Jiangshan
2008-10-26 21:59 ` Paul E. McKenney
2008-10-27 21:50 ` Paul E. McKenney
2008-10-27 23:57 ` Paul E. McKenney
2008-10-29 1:16 ` Paul E. McKenney
2008-10-29 1:31 ` Lai Jiangshan
2008-10-30 15:52 ` Paul E. McKenney
2008-10-09 1:33 ` RCU hang on cpu re-hotplug with 2.6.27rc8 Paul E. McKenney
2008-10-09 4:56 ` Andi Kleen
2008-10-09 7:24 ` Thomas Gleixner
2008-10-09 8:22 ` Andi Kleen
2008-10-09 11:44 ` Paul E. McKenney
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