From: "Bruno Prémont" <bonbons@linux-vserver.org>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
Ingo Molnar <mingo@elte.hu>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
paulmck@linux.vnet.ibm.com, Mike Frysinger <vapier.adi@gmail.com>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
linux-fsdevel@vger.kernel.org,
"Paul E. McKenney" <paul.mckenney@linaro.org>,
Pekka Enberg <penberg@kernel.org>
Subject: Re: 2.6.39-rc4+: Kernel leaking memory during FS scanning, regression?
Date: Wed, 27 Apr 2011 20:41:39 +0200 [thread overview]
Message-ID: <20110427204139.1b0ea23b@neptune.home> (raw)
In-Reply-To: <20110427081501.5ba28155@pluto.restena.lu>
[-- Attachment #1: Type: text/plain, Size: 5331 bytes --]
On Wed, 27 April 2011 Bruno Prémont wrote:
> On Wed, 27 Apr 2011 00:28:37 +0200 (CEST) Thomas Gleixner wrote:
> > On Tue, 26 Apr 2011, Linus Torvalds wrote:
> > > On Tue, Apr 26, 2011 at 10:09 AM, Bruno Prémont wrote:
> > > >
> > > > Just in case, /proc/$(pidof rcu_kthread)/status shows ~20k voluntary
> > > > context switches and exactly one non-voluntary one.
> > > >
> > > > In addition when rcu_kthread has stopped doing its work
> > > > `swapoff $(swapdevice)` seems to block forever (at least normal shutdown
> > > > blocks on disabling swap device).
Apparently it's not swapoff but `umount -a -t tmpfs` that's getting
stuck here. Manual swapoff worked.
The stuck umount:
[ 1714.960735] umount D 5a000040 5668 20331 20324 0x00000000
[ 1714.960735] c3c99e5c 00000086 dd407900 5a000040 dd25a1a8 dd407900 dd25a120 c3c99e0c
[ 1714.960735] c3c99e24 c10c1be2 c14d9f20 c3c99e5c c3c8c680 c3c8c680 000000bb c3c99e24
[ 1714.960735] c10c0b88 dd25a120 dd407900 ddfd4b40 c3c99e4c ddfc9d20 dd402380 5a000010
[ 1714.960735] Call Trace:
[ 1714.960735] [<c10c1be2>] ? check_object+0x92/0x210
[ 1714.960735] [<c10c0b88>] ? init_object+0x38/0x70
[ 1714.960735] [<c10c1be2>] ? check_object+0x92/0x210
[ 1714.960735] [<c13cb37d>] schedule_timeout+0x16d/0x280
[ 1714.960735] [<c10c0b88>] ? init_object+0x38/0x70
[ 1714.960735] [<c10c2122>] ? free_debug_processing+0x112/0x1f0
[ 1714.960735] [<c10a3791>] ? shmem_put_super+0x11/0x20
[ 1714.960735] [<c13cae9c>] wait_for_common+0x9c/0x150
[ 1714.960735] [<c102c890>] ? try_to_wake_up+0x170/0x170
[ 1714.960735] [<c13caff2>] wait_for_completion+0x12/0x20
[ 1714.960735] [<c1075ad7>] rcu_barrier_sched+0x47/0x50
[ 1714.960735] [<c104d3c0>] ? alloc_pid+0x370/0x370
[ 1714.960735] [<c10ce74a>] deactivate_locked_super+0x3a/0x60
[ 1714.960735] [<c10ce948>] deactivate_super+0x48/0x70
[ 1714.960735] [<c10e7427>] mntput_no_expire+0x87/0xe0
[ 1714.960735] [<c10e7800>] sys_umount+0x60/0x320
[ 1714.960735] [<c10b231a>] ? remove_vma+0x3a/0x50
[ 1714.960735] [<c10b3b22>] ? do_munmap+0x212/0x2f0
[ 1714.960735] [<c10e7ad9>] sys_oldumount+0x19/0x20
[ 1714.960735] [<c13cce10>] sysenter_do_call+0x12/0x26
which looks like lock conflict with RCU:
[ 1714.960735] rcu_kthread R running 6924 6 2 0x00000000
[ 1714.960735] dd473f28 00000046 5a000240 dbd6ba7c dd407360 ddfaf840 dbd6b740 dd473ed8
[ 1714.960735] ddfaee00 dd407a20 5a000000 dd473f28 dd445040 dd445040 0000009c dd473f0c
[ 1714.960735] c10c1be2 c14d9f20 dbf7057c 0000005a 000000bb 000000bb dd473f0c c10c0b88
[ 1714.960735] Call Trace:
[ 1714.960735] [<c10c1be2>] ? check_object+0x92/0x210
[ 1714.960735] [<c10c0b88>] ? init_object+0x38/0x70
[ 1714.960735] [<c103fd8d>] ? lock_timer_base+0x2d/0x70
[ 1714.960735] [<c13cb347>] schedule_timeout+0x137/0x280
[ 1714.960735] [<c103fef0>] ? sys_gettid+0x20/0x20
[ 1714.960735] [<c13cb4e4>] schedule_timeout_interruptible+0x14/0x20
[ 1714.960735] [<c1075a70>] rcu_kthread+0xa0/0xc0
[ 1714.960735] [<c1050190>] ? wake_up_bit+0x70/0x70
[ 1714.960735] [<c10759d0>] ? rcu_process_callbacks+0x60/0x60
[ 1714.960735] [<c104fc04>] kthread+0x74/0x80
[ 1714.960735] [<c104fb90>] ? flush_kthread_worker+0x90/0x90
[ 1714.960735] [<c13cd336>] kernel_thread_helper+0x6/0xd
(I have rest of sysreq+t output available in case someone wants it)
> > > > If I get to do it when I get back home I will manually try to swapoff
> > > > and take process traces with sysrq-t.
> > >
> > > That "exactly one non-voluntary one" sounds like the smoking gun.
It's not the gun we're looking for as it's already smoking long before
any RCU-managed slabs start piling up (e.g. already when I get at a
shell after boot sequence).
Voluntary context switches stay constant from the time on SLABs pile up.
(which makes sense as it doesn't run get CPU slices anymore)
> > Can you please enable CONFIG_SCHED_DEBUG and provide the output of
> > /proc/sched_stat when the problem surfaces and a minute after the
> > first snapshot?
hm, did you mean CONFIG_SCHEDSTAT or /proc/sched_debug?
I did use CONFIG_SCHED_DEBUG (and there is no /proc/sched_stat) so I took
/proc/sched_debug which exists... (attached, taken about 7min and +1min
after SLABs started piling up), though build processes were SIGSTOPped
during first minute.
printk wrote (in case its timestamp is useful, more below):
[ 518.480103] sched: RT throttling activated
If my choice was the wrong one, please tell so I can generate the other
ones.
> > Also please apply the patch below and check, whether the printk shows
> > up in your dmesg.
>
> > Index: linux-2.6-tip/kernel/sched_rt.c
> > ===================================================================
> > --- linux-2.6-tip.orig/kernel/sched_rt.c
> > +++ linux-2.6-tip/kernel/sched_rt.c
> > @@ -609,6 +609,7 @@ static int sched_rt_runtime_exceeded(str
> >
> > if (rt_rq->rt_time > runtime) {
> > rt_rq->rt_throttled = 1;
> > + printk_once(KERN_WARNING "sched: RT throttling activated\n");
This gun is triggering right before RCU-managed slabs start piling up as
visible under slabtop so chances are it's at least a related!
Bruno
> > if (rt_rq_throttled(rt_rq)) {
> > sched_rt_rq_dequeue(rt_rq);
> > return 1;
[-- Attachment #2: sched_debug-n --]
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.se->sum_exec_runtime : 0.668872
.se->load.weight : 1024
cfs_rq[0]:/autogroup-13
.exec_clock : 0.000000
.MIN_vruntime : 0.000001
.min_vruntime : 948.016263
.max_vruntime : 0.000001
.spread : 0.000000
.spread0 : -249743.823544
.nr_spread_over : 0
.nr_running : 0
.load : 0
.se->exec_start : 960791.018110
.se->vruntime : 250691.430149
.se->sum_exec_runtime : 945.604743
.se->load.weight : 1024
cfs_rq[0]:/autogroup-12
.exec_clock : 0.000000
.MIN_vruntime : 0.000001
.min_vruntime : 7896.659461
.max_vruntime : 0.000001
.spread : 0.000000
.spread0 : -242795.180346
.nr_spread_over : 0
.nr_running : 1
.load : 1024
.se->exec_start : 961260.183602
.se->vruntime : 250691.669201
.se->sum_exec_runtime : 7896.210852
.se->load.weight : 1024
cfs_rq[0]:/autogroup-11
.exec_clock : 0.000000
.MIN_vruntime : 0.000001
.min_vruntime : 327444.606138
.max_vruntime : 0.000001
.spread : 0.000000
.spread0 : 76752.766331
.nr_spread_over : 0
.nr_running : 0
.load : 0
.se->exec_start : 590827.086481
.se->vruntime : 246807.766077
.se->sum_exec_runtime : 227004.896350
.se->load.weight : 1024
cfs_rq[0]:/autogroup-9
.exec_clock : 0.000000
.MIN_vruntime : 0.000001
.min_vruntime : 4.901558
.max_vruntime : 0.000001
.spread : 0.000000
.spread0 : -250686.938249
.nr_spread_over : 0
.nr_running : 0
.load : 0
.se->exec_start : 16353.807059
.se->vruntime : 8798.213404
.se->sum_exec_runtime : 5.864229
.se->load.weight : 1024
cfs_rq[0]:/autogroup-8
.exec_clock : 0.000000
.MIN_vruntime : 0.000001
.min_vruntime : 5.092357
.max_vruntime : 0.000001
.spread : 0.000000
.spread0 : -250686.747450
.nr_spread_over : 0
.nr_running : 0
.load : 0
.se->exec_start : 16351.804335
.se->vruntime : 8798.060733
.se->sum_exec_runtime : 6.047419
.se->load.weight : 1024
cfs_rq[0]:/autogroup-4
.exec_clock : 0.000000
.MIN_vruntime : 0.000001
.min_vruntime : 194.043637
.max_vruntime : 0.000001
.spread : 0.000000
.spread0 : -250497.796170
.nr_spread_over : 0
.nr_running : 0
.load : 0
.se->exec_start : 214180.833484
.se->vruntime : 16973.019690
.se->sum_exec_runtime : 1179.311396
.se->load.weight : 1024
cfs_rq[0]:/autogroup-1
.exec_clock : 0.000000
.MIN_vruntime : 0.000001
.min_vruntime : 48.036315
.max_vruntime : 0.000001
.spread : 0.000000
.spread0 : -250643.803492
.nr_spread_over : 0
.nr_running : 0
.load : 0
.se->exec_start : 960971.811607
.se->vruntime : 250688.941814
.se->sum_exec_runtime : 50.536536
.se->load.weight : 1024
cfs_rq[0]:/
.exec_clock : 0.000000
.MIN_vruntime : 250691.839807
.min_vruntime : 250691.839807
.max_vruntime : 250691.839807
.spread : 0.000000
.spread0 : 0.000000
.nr_spread_over : 0
.nr_running : 2
.load : 2048
rt_rq[0]:
.rt_nr_running : 2
.rt_throttled : 1
.rt_time : 950.008387
.rt_runtime : 950.000000
runnable tasks:
task PID tree-key switches prio exec-runtime sum-exec sum-sleep
----------------------------------------------------------------------------------------------------------
rcu_kthread 6 0.000000 24701 98 0 0 0.000000 0.000000 0.000000 /
watchdog/0 7 0.000000 154 0 0 0 0.000000 0.000000 0.000000 /
R cat 20304 7896.659461 0 120 0 0 0.000000 0.000000 0.000000 /autogroup-12
next prev parent reply other threads:[~2011-04-27 18:41 UTC|newest]
Thread overview: 88+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-24 18:21 2.6.39-rc4+: Kernel leaking memory during FS scanning, regression? Bruno Prémont
2011-04-24 21:59 ` Bruno Prémont
2011-04-25 2:42 ` KOSAKI Motohiro
2011-04-25 7:47 ` Mike Frysinger
2011-04-25 9:17 ` Bruno Prémont
2011-04-25 9:25 ` Pekka Enberg
2011-04-25 10:34 ` Bruno Prémont
2011-04-25 11:41 ` Bruno Prémont
2011-04-25 11:47 ` Pekka Enberg
2011-04-25 12:11 ` Bruno Prémont
2011-04-25 12:14 ` Tetsuo Handa
2011-04-25 12:21 ` Tetsuo Handa
2011-04-25 15:22 ` Linus Torvalds
2011-04-25 16:04 ` Bruno Prémont
2011-04-25 16:31 ` Linus Torvalds
2011-04-25 17:00 ` Bruno Prémont
2011-04-25 17:10 ` Linus Torvalds
2011-04-25 17:20 ` Linus Torvalds
2011-04-25 18:36 ` Bruno Prémont
2011-04-25 19:16 ` Paul E. McKenney
2011-04-25 21:10 ` Bruno Prémont
2011-04-25 21:26 ` Paul E. McKenney
2011-04-25 21:30 ` Linus Torvalds
2011-04-25 21:49 ` Paul E. McKenney
2011-04-26 6:19 ` Bruno Prémont
2011-04-26 11:27 ` Paul E. McKenney
2011-04-26 16:38 ` Bruno Prémont
2011-04-26 17:09 ` Bruno Prémont
2011-04-26 17:18 ` Linus Torvalds
2011-04-26 22:28 ` Thomas Gleixner
2011-04-27 6:15 ` Bruno Prémont
2011-04-27 18:41 ` Bruno Prémont [this message]
2011-04-27 19:16 ` Pádraig Brady
2011-04-27 19:34 ` Bruno Prémont
2011-04-27 22:05 ` Paul E. McKenney
2011-04-27 20:40 ` Bruno Prémont
2011-04-27 22:07 ` Paul E. McKenney
2011-04-28 6:10 ` Bruno Prémont
2011-04-27 22:06 ` Thomas Gleixner
2011-04-27 22:27 ` Paul E. McKenney
2011-04-27 22:32 ` Thomas Gleixner
2011-04-27 22:59 ` Paul E. McKenney
2011-04-27 23:28 ` Linus Torvalds
2011-04-27 23:46 ` Linus Torvalds
2011-04-28 9:09 ` Thomas Gleixner
2011-04-28 9:17 ` Sedat Dilek
2011-04-28 9:40 ` Thomas Gleixner
2011-04-28 10:12 ` Mike Galbraith
2011-04-28 9:45 ` Sedat Dilek
2011-04-28 10:26 ` Paul E. McKenney
2011-04-28 13:30 ` Mike Galbraith
2011-04-28 15:28 ` Sedat Dilek
2011-04-28 15:44 ` Sedat Dilek
2011-04-28 15:48 ` Linus Torvalds
2011-04-28 18:49 ` Thomas Gleixner
2011-04-28 20:23 ` Bruno Prémont
2011-04-28 20:29 ` Thomas Gleixner
2011-04-28 20:44 ` Bruno Prémont
2011-04-28 21:04 ` Thomas Gleixner
2011-04-28 21:51 ` john stultz
2011-04-28 22:02 ` Thomas Gleixner
2011-04-28 23:06 ` Sedat Dilek
2011-04-28 23:35 ` Sedat Dilek
2011-04-29 0:42 ` Paul E. McKenney
2011-04-29 9:34 ` Thomas Gleixner
2011-04-29 7:55 ` Sedat Dilek
2011-04-29 18:09 ` Mike Frysinger
2011-04-29 18:26 ` Thomas Gleixner
2011-04-29 19:31 ` Bruno Prémont
2011-04-29 20:10 ` Thomas Gleixner
2011-04-29 20:14 ` Bruno Prémont
2011-04-30 9:14 ` Sedat Dilek
2011-04-28 20:41 ` Sedat Dilek
2011-04-28 19:22 ` Mike Galbraith
2011-04-27 21:55 ` Paul E. McKenney
2011-04-28 6:22 ` Bruno Prémont
2011-04-28 10:26 ` Paul E. McKenney
2011-04-26 17:12 ` Linus Torvalds
2011-04-26 18:50 ` Paul E. McKenney
2011-04-26 19:17 ` Sedat Dilek
2011-04-27 22:02 ` Paul E. McKenney
2011-04-25 22:08 ` Mike Frysinger
2011-04-25 17:29 ` Paul E. McKenney
2011-04-25 18:13 ` Sedat Dilek
2011-04-25 18:28 ` Paul E. McKenney
2011-04-25 17:26 ` Paul E. McKenney
2011-04-27 10:28 ` Catalin Marinas
2011-04-25 17:51 ` Pekka Enberg
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