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Date: Mon, 30 Aug 2010 10:51:24 -0400 (EDT)
From: CAI Qian <caiqian@...hat.com>
To: Tejun Heo <tj@...nel.org>
Cc: kexec <kexec@...ts.infradead.org>, linux-next@...r.kernel.org,
torvalds@...ux-foundation.org,
linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: kdump regression compared to v2.6.35
----- "CAI Qian" <caiqian@...hat.com> wrote:
> ----- "Tejun Heo" <tj@...nel.org> wrote:
>
> > Hello,
> >
> > On 08/30/2010 04:02 PM, CAI Qian wrote:
> > >> Hmm, odd. So, here's the said debug patch. It will
> periodically
> > >> check all works and report if any work is being delayed for too
> > long.
> > >> If the max wait goes over 30secs, it will dump all task states
> and
> > >> disable itself. Can you please apply the patch on top of rc2 +
> > >> wq#for-linus and report the output? It should tell us who's
> stuck
> > >> where.
> > >
> > > Nothing new was printed after around 10 minutes.
> >
> > Eh... that's interesting. That means no work is stalled on
> > workqueues, so it at least is not a workqueue stall. Can you
> please
> > try the following then? Or if sysrq wasn't working because your
> ...
> SMP alternatives: switching to UP code
> ACPI: Core revision 20100702
> ftrace: converting mcount calls to 0f 1f 44 00 00
> ftrace: allocating 18488 entries in 73 pages
> XXX show_state_timer registered
> Not enabling x2apic, Intr-remapping init failed.
> Setting APIC routing to physical flat
> ..TIMER: vector=0x30 apic1=0 pin1=2 apic2=-1 pin2=-1
> CPU0: Intel(R) Xeon(R) CPU X7550 @ 2.00GHz stepping 06
> Brought up 1 CPUs
> Total of 1 processors activated (3990.10 BogoMIPS).
> devtmpfs: initialized
> regulator: core version 0.5
> NET: Registered protocol family 16
> ACPI FADT declares the system doesn't support PCIe ASPM, so disable
> it
> ACPI: bus type pci registered
> PCI: MMCONFIG for domain 0000 [bus 00-ff] at [mem
> 0x80000000-0x8fffffff] (base 0x80000000)
> PCI: MMCONFIG at [mem 0x80000000-0x8fffffff] reserved in E820
> PCI: Using configuration type 1 for base access
> bio: create slab <bio-0> at 0
Hit return too quickly, and here were something new,
task PC stack pid father
swapper R running task 0 1 0 0x00000000
ffff88046dc1bcf0 0000000000000046 ffffffff81796812 ffffffff81a90700
ffffffff81c21420 0000000000015d00 ffff88106e5dc040 0000000000015d00
ffff88106e5dc5d0 ffff88046dc1bfd8 ffff88106e5dc5d8 ffff88046dc1bfd8
Call Trace:
[<ffffffff8105757a>] __cond_resched+0x2a/0x40
[<ffffffff8149c8a0>] _cond_resched+0x30/0x40
[<ffffffff81136cf0>] kmem_cache_alloc_node_notrace+0xa0/0x120
[<ffffffff810f6bd0>] ? mempool_alloc_slab+0x0/0x20
[<ffffffff810f6fb1>] mempool_create_node+0x41/0x1a0
[<ffffffff810f6bb0>] ? mempool_free_slab+0x0/0x20
[<ffffffff810f7124>] mempool_create+0x14/0x20
[<ffffffff81176d53>] bioset_create+0x1a3/0x2f0
[<ffffffff81c685a8>] ? init_bio+0x0/0x141
[<ffffffff81c68693>] init_bio+0xeb/0x141
[<ffffffff81c64ff4>] ? default_bdi_init+0x9b/0xa2
[<ffffffff81002053>] do_one_initcall+0x43/0x190
[<ffffffff81c418ab>] kernel_init+0x2a0/0x330
[<ffffffff8100be84>] kernel_thread_helper+0x4/0x10
[<ffffffff81c4160b>] ? kernel_init+0x0/0x330
[<ffffffff8100be80>] ? kernel_thread_helper+0x0/0x10
kthreadd S 0000000000000000 0 2 0 0x00000000
ffff88046dc1fe90 0000000000000046 ffff88046dc1fe90 ffffffff81013596
0000000000000000 0000000000015d00 ffff88046dc1d4c0 0000000000015d00
ffff88046dc1da50 ffff88046dc1ffd8 ffff88046dc1da58 ffff88046dc1ffd8
Call Trace:
[<ffffffff81013596>] ? kernel_thread+0x76/0x80
[<ffffffff8100be80>] ? kernel_thread_helper+0x0/0x10
[<ffffffff8107fe85>] kthreadd+0x275/0x280
[<ffffffff8100be84>] kernel_thread_helper+0x4/0x10
[<ffffffff8107fc10>] ? kthreadd+0x0/0x280
[<ffffffff8100be80>] ? kernel_thread_helper+0x0/0x10
ksoftirqd/0 S 0000000000000000 0 3 2 0x00000000
ffff88046dc43ea0 0000000000000046 ffffffff81a5a4a0 ffff880002415d00
ffffffff81a5a4a0 0000000000015d00 ffff88046dc1ca80 0000000000015d00
ffff88046dc1d010 ffff88046dc43fd8 ffff88046dc1d018 ffff88046dc43fd8
Call Trace:
[<ffffffff81065c35>] run_ksoftirqd+0xe5/0x140
[<ffffffff81065b50>] ? run_ksoftirqd+0x0/0x140
[<ffffffff8107fc06>] kthread+0x96/0xa0
[<ffffffff8100be84>] kernel_thread_helper+0x4/0x10
[<ffffffff8107fb70>] ? kthread+0x0/0xa0
[<ffffffff8100be80>] ? kernel_thread_helper+0x0/0x10
kworker/0:0 S 0000000000000000 0 4 2 0x00000000
ffff88046dc45e50 0000000000000046 ffff88046dc45db0 ffffffff8104ac80
ffff88046dc45e00 0000000000015d00 ffff88046dc1c040 0000000000015d00
ffff88046dc1c5d0 ffff88046dc45fd8 ffff88046dc1c5d8 ffff88046dc45fd8
Call Trace:
[<ffffffff8104ac80>] ? __dequeue_entity+0x30/0x50
[<ffffffff8107b949>] worker_thread+0x259/0x3c0
[<ffffffff8107b6f0>] ? worker_thread+0x0/0x3c0
[<ffffffff8107fc06>] kthread+0x96/0xa0
[<ffffffff8100be84>] kernel_thread_helper+0x4/0x10
[<ffffffff8107fb70>] ? kthread+0x0/0xa0
[<ffffffff8100be80>] ? kernel_thread_helper+0x0/0x10
kworker/u:0 S 0000000000000000 0 5 2 0x00000000
ffff88046dc49e50 0000000000000046 ffff88046dc49db0 ffffffff8104ac80
ffff88046dc49e00 0000000000015d00 ffff88046dc47500 0000000000015d00
ffff88046dc47a90 ffff88046dc49fd8 ffff88046dc47a98 ffff88046dc49fd8
Call Trace:
[<ffffffff8104ac80>] ? __dequeue_entity+0x30/0x50
[<ffffffff8107b949>] worker_thread+0x259/0x3c0
[<ffffffff8107b6f0>] ? worker_thread+0x0/0x3c0
[<ffffffff8107fc06>] kthread+0x96/0xa0
[<ffffffff8100be84>] kernel_thread_helper+0x4/0x10
[<ffffffff8107fb70>] ? kthread+0x0/0xa0
[<ffffffff8100be80>] ? kernel_thread_helper+0x0/0x10
migration/0 S 0000000000000000 0 6 2 0x00000000
ffff88046dc4dde0 0000000000000046 ffff88046dc4dd60 ffffffff8104a7e8
ffff88046dc4dd70 0000000000015d00 ffff88046dc46ac0 0000000000015d00
ffff88046dc47050 ffff88046dc4dfd8 ffff88046dc47058 ffff88046dc4dfd8
Call Trace:
[<ffffffff8104a7e8>] ? update_curr+0xf8/0x1e0
[<ffffffff81009630>] ? __switch_to+0xd0/0x320
[<ffffffff810b1ec0>] ? cpu_stopper_thread+0x0/0x1d0
[<ffffffff810b1ffd>] cpu_stopper_thread+0x13d/0x1d0
[<ffffffff810b1ec0>] ? cpu_stopper_thread+0x0/0x1d0
[<ffffffff810b1ec0>] ? cpu_stopper_thread+0x0/0x1d0
[<ffffffff8107fc06>] kthread+0x96/0xa0
[<ffffffff8100be84>] kernel_thread_helper+0x4/0x10
[<ffffffff8107fb70>] ? kthread+0x0/0xa0
[<ffffffff8100be80>] ? kernel_thread_helper+0x0/0x10
cpuset S 0000000000000000 0 7 2 0x00000000
ffff88046dc6fe60 0000000000000046 ffff88046dc460b8 ffff88046dc460b8
0000000000000000 0000000000015d00 ffff88046dc46080 0000000000015d00
ffff88046dc46610 ffff88046dc6ffd8 ffff88046dc46618 ffff88046dc6ffd8
Call Trace:
[<ffffffff81050e39>] ? set_user_nice+0xc9/0x130
[<ffffffff81079789>] rescuer_thread+0x1a9/0x1d0
[<ffffffff810795e0>] ? rescuer_thread+0x0/0x1d0
[<ffffffff810795e0>] ? rescuer_thread+0x0/0x1d0
[<ffffffff8107fc06>] kthread+0x96/0xa0
[<ffffffff8100be84>] kernel_thread_helper+0x4/0x10
[<ffffffff8107fb70>] ? kthread+0x0/0xa0
[<ffffffff8100be80>] ? kernel_thread_helper+0x0/0x10
khelper S 0000000000000000 0 8 2 0x00000000
ffff88046dc73e60 0000000000000046 ffff88046dc71578 ffff88046dc71578
0000000000000000 0000000000015d00 ffff88046dc71540 0000000000015d00
ffff88046dc71ad0 ffff88046dc73fd8 ffff88046dc71ad8 ffff88046dc73fd8
Call Trace:
[<ffffffff81050e39>] ? set_user_nice+0xc9/0x130
[<ffffffff81079789>] rescuer_thread+0x1a9/0x1d0
[<ffffffff810795e0>] ? rescuer_thread+0x0/0x1d0
[<ffffffff810795e0>] ? rescuer_thread+0x0/0x1d0
[<ffffffff8107fc06>] kthread+0x96/0xa0
[<ffffffff8100be84>] kernel_thread_helper+0x4/0x10
[<ffffffff8107fb70>] ? kthread+0x0/0xa0
[<ffffffff8100be80>] ? kernel_thread_helper+0x0/0x10
netns S 0000000000000000 0 9 2 0x00000000
ffff88046dca7e60 0000000000000046 ffff88046dc70b38 ffff88046dc70b38
0000000000000000 0000000000015d00 ffff88046dc70b00 0000000000015d00
ffff88046dc71090 ffff88046dca7fd8 ffff88046dc71098 ffff88046dca7fd8
Call Trace:
[<ffffffff81050e39>] ? set_user_nice+0xc9/0x130
[<ffffffff81079789>] rescuer_thread+0x1a9/0x1d0
[<ffffffff810795e0>] ? rescuer_thread+0x0/0x1d0
[<ffffffff810795e0>] ? rescuer_thread+0x0/0x1d0
[<ffffffff8107fc06>] kthread+0x96/0xa0
[<ffffffff8100be84>] kernel_thread_helper+0x4/0x10
[<ffffffff8107fb70>] ? kthread+0x0/0xa0
[<ffffffff8100be80>] ? kernel_thread_helper+0x0/0x10
pm S 0000000000000000 0 10 2 0x00000000
ffff88046dca9e60 0000000000000046 ffff88046dc700f8 ffff88046dc700f8
0000000000000000 0000000000015d00 ffff88046dc700c0 0000000000015d00
ffff88046dc70650 ffff88046dca9fd8 ffff88046dc70658 ffff88046dca9fd8
Call Trace:
[<ffffffff81050e39>] ? set_user_nice+0xc9/0x130
[<ffffffff81079789>] rescuer_thread+0x1a9/0x1d0
[<ffffffff810795e0>] ? rescuer_thread+0x0/0x1d0
[<ffffffff810795e0>] ? rescuer_thread+0x0/0x1d0
[<ffffffff8107fc06>] kthread+0x96/0xa0
[<ffffffff8100be84>] kernel_thread_helper+0x4/0x10
[<ffffffff8107fb70>] ? kthread+0x0/0xa0
[<ffffffff8100be80>] ? kernel_thread_helper+0x0/0x10
sync_supers R running task 0 11 2 0x00000000
ffff88046dcebeb0 0000000000000046 ffffffff81a5a4a0 0000000000000000
ffff88106e5dc040 0000000000015d00 ffff88046dce9580 0000000000015d00
ffff88046dce9b10 ffff88046dcebfd8 ffff88046dce9b18 ffff88046dcebfd8
Call Trace:
[<ffffffff8110e780>] ? bdi_sync_supers+0x0/0x60
[<ffffffff8110e7c4>] bdi_sync_supers+0x44/0x60
[<ffffffff8110e780>] ? bdi_sync_supers+0x0/0x60
[<ffffffff8107fc06>] kthread+0x96/0xa0
[<ffffffff8100be84>] kernel_thread_helper+0x4/0x10
[<ffffffff8107fb70>] ? kthread+0x0/0xa0
[<ffffffff8100be80>] ? kernel_thread_helper+0x0/0x10
bdi-default S 0000000000000000 0 12 2 0x00000000
ffff88046dcefd40 0000000000000046 0000000000000000 0000000000000000
0000000000000000 0000000000015d00 ffff88046dce8b40 0000000000015d00
ffff88046dce90d0 ffff88046dceffd8 ffff88046dce90d8 ffff88046dceffd8
Call Trace:
[<ffffffff8149cd1c>] schedule_timeout+0x18c/0x2e0
[<ffffffff8106e260>] ? process_timeout+0x0/0x10
[<ffffffff8110f46d>] bdi_forker_thread+0x22d/0x500
[<ffffffff8110f240>] ? bdi_forker_thread+0x0/0x500
[<ffffffff8110f240>] ? bdi_forker_thread+0x0/0x500
[<ffffffff8107fc06>] kthread+0x96/0xa0
[<ffffffff8100be84>] kernel_thread_helper+0x4/0x10
[<ffffffff8107fb70>] ? kthread+0x0/0xa0
[<ffffffff8100be80>] ? kernel_thread_helper+0x0/0x10
kintegrityd R running task 0 13 2 0x00000008
ffffffffffffff10 ffffffff81078e25 0000000000000010 0000000000000206
ffff88046dcf1e40 0000000000000018 ffff88046dc9a440 ffff88046dc9a440
ffff88088e231f00 ffff88088e239300 ffff88046dcf1ee0 ffffffff810796e8
Call Trace:
[<ffffffff81078e25>] ? worker_maybe_bind_and_lock+0x55/0xf0
[<ffffffff810796e8>] ? rescuer_thread+0x108/0x1d0
[<ffffffff810795e0>] ? rescuer_thread+0x0/0x1d0
[<ffffffff810795e0>] ? rescuer_thread+0x0/0x1d0
[<ffffffff8107fc06>] ? kthread+0x96/0xa0
[<ffffffff8100be84>] ? kernel_thread_helper+0x4/0x10
[<ffffffff8107fb70>] ? kthread+0x0/0xa0
[<ffffffff8100be80>] ? kernel_thread_helper+0x0/0x10
Sched Debug Version: v0.09, 2.6.36-rc2-wq+ #20
now at 180552.999849 msecs
.jiffies : 4294847851
.sysctl_sched_latency : 6.000000
.sysctl_sched_min_granularity : 2.000000
.sysctl_sched_wakeup_granularity : 1.000000
.sysctl_sched_child_runs_first : 0
.sysctl_sched_features : 15471
.sysctl_sched_tunable_scaling : 1 (logaritmic)
cpu#0, 1995.053 MHz
.nr_running : 3
.load : 90809
.nr_switches : 57
.nr_load_updates : 180566
.nr_uninterruptible : 0
.next_balance : 4294.668298
.curr->pid : 13
.clock : 181316.279544
.cpu_load[0] : 90809
.cpu_load[1] : 90809
.cpu_load[2] : 90809
.cpu_load[3] : 90809
.cpu_load[4] : 90809
.yld_count : 0
.sched_switch : 0
.sched_count : 59
.sched_goidle : 1
.avg_idle : 1000000
.ttwu_count : 34
.ttwu_local : 34
.bkl_count : 0
cfs_rq[0]:/
.exec_clock : 181045.961245
.MIN_vruntime : 293.512617
.min_vruntime : 296.512617
.max_vruntime : 296.512617
.spread : 3.000000
.spread0 : 0.000000
.nr_running : 3
.load : 90809
.nr_spread_over : 0
.shares : 0
rt_rq[0]:/
.rt_nr_running : 0
.rt_throttled : 0
.rt_time : 0.000000
.rt_runtime : 950.000000
runnable tasks:
task PID tree-key switches prio exec-runtime sum-exec sum-sleep
----------------------------------------------------------------------------------------------------------
swapper 1 296.512617 23 120 296.512617 282.090606 0.046441 /
sync_supers 11 293.512617 2 120 293.512617 0.002502 5354.887736 /
R kintegrityd 13 2382.377879 1 100 2382.377879 180846.751167 0.001076 /
> > keyboard wasn't initialized at that point, you can setup serial
> > console and trigger sysrq that way.
> Yes, it was triggered from a serial console.
> > Thanks.
> >
> > diff --git a/init/main.c b/init/main.c
> > index 94ab488..e156b8f 100644
> > --- a/init/main.c
> > +++ b/init/main.c
> > @@ -423,11 +423,19 @@ static void __init setup_command_line(char
> > *command_line)
> >
> > static __initdata DECLARE_COMPLETION(kthreadd_done);
> >
> > +static void show_state_timer_fn(unsigned long data)
> > +{
> > + show_state();
> > +}
> > +static DEFINE_TIMER(show_state_timer, show_state_timer_fn, 0, 0);
> > +
> > static noinline void __init_refok rest_init(void)
> > __releases(kernel_lock)
> > {
> > int pid;
> >
> > + printk("XXX show_state_timer registered\n");
> > + mod_timer(&show_state_timer, jiffies + 180 * HZ);
> > rcu_scheduler_starting();
> > /*
> > * We need to spawn init first so that it obtains pid 1, however
> >
> > _______________________________________________
> > kexec mailing list
> > kexec@...ts.infradead.org
> > http://lists.infradead.org/mailman/listinfo/kexec
>
> _______________________________________________
> kexec mailing list
> kexec@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/kexec
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