On Sat, Jan 19, 2013 at 12:58 AM, Rafael J. Wysocki <rjw@xxxxxxx> wrote:
> On Saturday, January 19, 2013 12:41:11 AM Sedat Dilek wrote:
>> On Sat, Jan 19, 2013 at 12:39 AM, Rafael J. Wysocki <rjw@xxxxxxx> wrote:
>> > On Saturday, January 19, 2013 12:28:55 AM Sedat Dilek wrote:
>> >> On Sat, Jan 19, 2013 at 12:25 AM, Rafael J. Wysocki <rjw@xxxxxxx> wrote:
>> >> > On Friday, January 18, 2013 11:56:53 PM Sedat Dilek wrote:
>> >> >> On Fri, Jan 18, 2013 at 11:35 PM, Sedat Dilek <sedat.dilek@xxxxxxxxx> wrote:
>> >> >> > On Fri, Jan 18, 2013 at 11:20 PM, Rafael J. Wysocki <rjw@xxxxxxx> wrote:
>> >> >> >> On Friday, January 18, 2013 11:11:07 PM Sedat Dilek wrote:
>> >> >> >>> On Fri, Jan 18, 2013 at 5:37 AM, Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx> wrote:
>> >> >> >>> > Hi all,
>> >> >> >>> >
>> >> >> >>> > Changes since 20130117:
>> >> >> >>> >
>> >> >> >>> > Undropped tree: samung
>> >> >> >>> >
>> >> >> >>> > The powerpc tree still had a build failure.
>> >> >> >>> >
>> >> >> >>> > The driver-core tree gained a build failure for which I applied a merge
>> >> >> >>> > fix patch.
>> >> >> >>> >
>> >> >> >>> > The gpio-lw tree gained a build failure so I used the version from
>> >> >> >>> > next-20130117.
>> >> >> >>> >
>> >> >> >>> > The samsung tree lost the majority of its conflicts but gained more
>> >> >> >>> > against the arm-soc and slave-dma tree.
>> >> >> >>> >
>> >> >> >>> > ----------------------------------------------------------------------------
>> >> >> >>> >
>> >> >> >>>
>> >> >> >>> From my dmesg diff-file:
>> >> >> >>>
>> >> >> >>> +[ 288.730849] PM: Syncing filesystems ... done.
>> >> >> >>> +[ 294.050498] Freezing user space processes ... (elapsed 0.04 seconds) done.
>> >> >> >>> +[ 294.097024] Freezing remaining freezable tasks ...
>> >> >> >>> +[ 314.098849] Freezing of tasks failed after 20.01 seconds (1 tasks
>> >> >> >>> refusing to freeze, wq_busy=0):
>> >> >> >>> +[ 314.098862] jbd2/loop0-8 D ffffffff8180d780 0 297 2 0x00000000
>> >> >> >>> +[ 314.098865] ffff880117ec5b68 0000000000000046 ffff880117ec5b08
>> >> >> >>> ffffffff81044c29
>> >> >> >>> +[ 314.098868] ffff88011829dc80 ffff880117ec5fd8 ffff880117ec5fd8
>> >> >> >>> ffff880117ec5fd8
>> >> >> >>> +[ 314.098871] ffff880119b34560 ffff88011829dc80 ffff880117ec5b68
>> >> >> >>> ffff88011fad4738
>> >> >> >>> +[ 314.098873] Call Trace:
>> >> >> >>> +[ 314.098881] [<ffffffff81044c29>] ? default_spin_lock_flags+0x9/0x10
>> >> >> >>> +[ 314.098885] [<ffffffff811c63e0>] ? __wait_on_buffer+0x30/0x30
>> >> >> >>> +[ 314.098888] [<ffffffff816b4b59>] schedule+0x29/0x70
>> >> >> >>> +[ 314.098890] [<ffffffff816b4c2f>] io_schedule+0x8f/0xd0
>> >> >> >>> +[ 314.098892] [<ffffffff811c63ee>] sleep_on_buffer+0xe/0x20
>> >> >> >>> +[ 314.098896] [<ffffffff816b342f>] __wait_on_bit+0x5f/0x90
>> >> >> >>> +[ 314.098898] [<ffffffff811c5aa1>] ? submit_bh+0x121/0x1e0
>> >> >> >>> +[ 314.098900] [<ffffffff811c63e0>] ? __wait_on_buffer+0x30/0x30
>> >> >> >>> +[ 314.098903] [<ffffffff816b34dc>] out_of_line_wait_on_bit+0x7c/0x90
>> >> >> >>> +[ 314.098906] [<ffffffff8107eb00>] ? autoremove_wake_function+0x40/0x40
>> >> >> >>> +[ 314.098909] [<ffffffff811c63de>] __wait_on_buffer+0x2e/0x30
>> >> >> >>> +[ 314.098913] [<ffffffff8128a6a1>]
>> >> >> >>> jbd2_journal_commit_transaction+0x1791/0x1960
>> >> >> >>> +[ 314.098917] [<ffffffff8109269d>] ? sched_clock_cpu+0xbd/0x110
>> >> >> >>> +[ 314.098920] [<ffffffff8107eac0>] ? add_wait_queue+0x60/0x60
>> >> >> >>> +[ 314.098923] [<ffffffff81069fbf>] ? try_to_del_timer_sync+0x4f/0x70
>> >> >> >>> +[ 314.098925] [<ffffffff8128e4e8>] kjournald2+0xb8/0x240
>> >> >> >>> +[ 314.098927] [<ffffffff8107eac0>] ? add_wait_queue+0x60/0x60
>> >> >> >>> +[ 314.098929] [<ffffffff8128e430>] ? commit_timeout+0x10/0x10
>> >> >> >>> +[ 314.098931] [<ffffffff8107ded0>] kthread+0xc0/0xd0
>> >> >> >>> +[ 314.098933] [<ffffffff8107de10>] ? flush_kthread_worker+0xb0/0xb0
>> >> >> >>> +[ 314.098936] [<ffffffff816be52c>] ret_from_fork+0x7c/0xb0
>> >> >> >>> +[ 314.098938] [<ffffffff8107de10>] ? flush_kthread_worker+0xb0/0xb0
>> >> >> >>> +[ 314.098969]
>> >> >> >>> +[ 314.098970] Restarting kernel threads ... done.
>> >> >> >>> +[ 314.099052] Restarting tasks ... done.
>> >> >> >>>
>> >> >> >>> Please, have a lot at it.
>> >> >> >>
>> >> >> >> This is a freezer failure while freezing kernel threads, so I don't think it's
>> >> >> >> related to ACPI or PM directly.
>> >> >> >>
>> >> >> >> Does it happen on every suspend?
>> >> >> >>
>> >> >> >
>> >> >> > No, I only did one S/R.
>> >> >> >
>> >> >> > I have built a 2nd new kernel where I pulled-in latest pm.git#linux-next.
>> >> >> > With this kernel two S/Rs were fine - but that says not much.
>> >> >> >
>> >> >>
>> >> >> After several S/Rs on the "buggy" -1 kernel I know see in my syslogs:
>> >> >>
>> >> >> Jan 18 23:50:02 fambox kernel: [ 141.853828] Disabling non-boot CPUs ...
>> >> >> Jan 18 23:50:02 fambox kernel: [ 141.956943] smpboot: CPU 1 is now offline
>> >> >> Jan 18 23:50:02 fambox kernel: [ 141.957438] NOHZ: local_softirq_pending 02
>> >> >> Jan 18 23:50:02 fambox kernel: [ 141.957454] NOHZ: local_softirq_pending 02
>> >> >> Jan 18 23:50:02 fambox kernel: [ 142.060830] smpboot: CPU 2 is now offline
>> >> >> Jan 18 23:50:02 fambox kernel: [ 142.164639] smpboot: CPU 3 is now offline
>> >> >
>> >> > Are you worried about the "local_softirq_pending" messages?
>> >> >
>> >>
>> >> That's the only new messages I have seen after several S/Rs.
>> >
>> > They are kind of unusual.
>> >
>> > Anyway, they seem to be related to CPU hotplug (CPU offline), so you can try
>> > if you can trigger them through the sysfs CPU offline/online interface.
>> >
>>
>> Can you explain that a bit clearer or give some sample lines for testing?
>
> There is a sysfs file
>
> /sys/devices/system/cpu/cpuX/online
>
> (where X=0,1,2,3,...) for each CPU core in the system. The value read from it
> indicates whether or not the given core is online (1 means online). Writing 0
> to it means that the given core should be put offline. Writing 1 means to put
> it back online. You can simply write first 0s and than 1s to those files
> for CPUs > 0 multiple times in a row and see if that triggers messages like the
> above. If it does, that may mean there's been a change in kernel/cpu.c, for
> example, that causes it to appear. The change may have been made somewhere in
> arch/x86 too, though.
>
[ CCing x86 folks ]
Thanks for the explanations.
>> >> If you have a testcase for me to reproduce it here, I would be happy.
>> >
>> > Do you mean the freezer-related issue?
>> >
>>
>> Any one as I am still stepping in the dark.
>> I checked my disc-space as I built a lot of software today and run
>> once out of space.
>> But 1.7GiB should be enough on / for testing.
>> I wanted to run the new LTP version I built the last days.
>> Let's see what I get...
>
> Stress-testing the freezer is rather easy and doesn't require disk space.
> All it takes is to echo "freezer" to /sys/power/pm_test and then do
> "echo mem > /sys/power/state && sleep 1" in a loop. This is described in
> Documentation/power/basic-pm-debugging.txt IIRC.
>
Didn't know there is some cool docs about PM around.
I will look into this.
Furthermore, I have seen on a restart...
BUG: soft lockup - CPU#3 stuck for 23s! [kworker/3:2:6079]
...approx 10 lines and a nothing happened I turned the machine off via
power-button.
- Sedat -
> Thanks,
> Rafael
>
>
> --
> I speak only for myself.
> Rafael J. Wysocki, Intel Open Source Technology Center.
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