On Wed, 27 April 2011 Bruno PrÃmont 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 PrÃmont 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;
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----------------------------------------------------------------------------------------------------------
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.se->exec_start : 590827.086481
.se->vruntime : 246807.766077
.se->sum_exec_runtime : 227004.896350
.se->load.weight : 1024
cfs_rq[0]:/autogroup-9
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.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
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.spread0 : -250686.747450
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.se->exec_start : 16351.804335
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.se->sum_exec_runtime : 6.047419
.se->load.weight : 1024
cfs_rq[0]:/autogroup-4
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.min_vruntime : 194.043637
.max_vruntime : 0.000001
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.spread0 : -250497.796170
.nr_spread_over : 0
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.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
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.min_vruntime : 48.036315
.max_vruntime : 0.000001
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.spread0 : -250643.803492
.nr_spread_over : 0
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.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
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.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
