Re: linux-next: Tree for Jan 18 [ BROKEN suspend: jbd2|acpi|pm? ]

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On Sat, Jan 19, 2013 at 3:13 AM, Sedat Dilek <sedat.dilek@xxxxxxxxx> wrote:
> On Sat, Jan 19, 2013 at 2:55 AM, Sedat Dilek <sedat.dilek@xxxxxxxxx> wrote:
>> 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.
>>>
>>>> >> 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.
>>>
>>
>> [ CCing TTY and FBDEV folks ]
>>
>> [ TESTCASE ]
>>
>> kernel-config: CONFIG_PM_DEBUG=y
>>
>> root# echo "freezer" > /sys/power/pm_test
>>
>> root# echo mem > /sys/power/state && sleep 1
>>
>> This produces several TTY call-traces...
>>
>> +[  810.417180] ------------[ cut here ]------------
>> +[  810.417203] WARNING: at drivers/tty/tty_buffer.c:475
>> flush_to_ldisc+0x12f/0x1f0()
>> +[  810.417207] Hardware name: 530U3BI/530U4BI/530U4BH
>> +[  810.417210] tty is NULL
>> +[  791.200932] Freezing remaining freezable tasks ...
>> +[  810.417213] Modules linked in: bnep rfcomm parport_pc ppdev
>> snd_hda_codec_hdmi snd_hda_codec_realtek coretemp kvm_intel kvm arc4
>> iwldvm ghash_clmulni_intel aesni_intel snd_hda_intel mac80211 xts
>> uvcvideo snd_hda_codec aes_x86_64 lrw snd_hwdep gf128mul
>> videobuf2_vmalloc joydev ablk_helper snd_pcm i915 videobuf2_memops
>> cryptd videobuf2_core snd_page_alloc videodev snd_seq_midi
>> snd_seq_midi_event iwlwifi snd_rawmidi snd_seq i2c_algo_bit snd_timer
>> drm_kms_helper psmouse snd_seq_device drm btusb microcode cfg80211 snd
>> bluetooth serio_raw soundcore lpc_ich samsung_laptop wmi mei mac_hid
>> video lp parport hid_generic r8169 usbhid hid
>> +[  810.417307] Pid: 37, comm: kworker/0:1 Not tainted
>> 3.8.0-rc4-next20130118-3-iniza-generic #1
>> +[  810.417310] Call Trace:
>> +[  810.417325]  [<ffffffff81058acf>] warn_slowpath_common+0x7f/0xc0
>> +[  810.417332]  [<ffffffff81058bc6>] warn_slowpath_fmt+0x46/0x50
>> +[  810.417340]  [<ffffffff8141b03f>] flush_to_ldisc+0x12f/0x1f0
>> +[  810.417349]  [<ffffffff81077d95>] process_one_work+0x155/0x460
>> +[  810.417357]  [<ffffffff81078a38>] worker_thread+0x168/0x410
>> +[  810.417364]  [<ffffffff810788d0>] ? manage_workers+0x2c0/0x2c0
>> +[  810.417371]  [<ffffffff8107ded0>] kthread+0xc0/0xd0
>> +[  810.417377]  [<ffffffff8107de10>] ? flush_kthread_worker+0xb0/0xb0
>> +[  810.417385]  [<ffffffff816beaec>] ret_from_fork+0x7c/0xb0
>> +[  810.417427]  [<ffffffff8107de10>] ? flush_kthread_worker+0xb0/0xb0
>> +[  810.417438] ---[ end trace a302c76f044b14c2 ]---
>>
>> ...and my first reported call-trace is also seen afterwards...
>>
>> +[  811.192835] Freezing of tasks failed after 20.01 seconds (1 tasks
>> refusing to freeze, wq_busy=0):
>> +[  811.192957] jbd2/loop0-8    D ffffffff8180d780     0   289      2 0x00000000
>> +[  811.192966]  ffff880118115b68 0000000000000046 ffff880118761720
>> 0000000000000001
>> +[  811.192974]  ffff880118761720 ffff880118115fd8 ffff880118115fd8
>> ffff880118115fd8
>> +[  811.192981]  ffffffff81c15440 ffff880118761720 ffff880118115b68
>> ffff88011fa14738
>> +[  811.192988] Call Trace:
>> +[  811.193006]  [<ffffffff811c6830>] ? __wait_on_buffer+0x30/0x30
>> +[  811.193015]  [<ffffffff816b5149>] schedule+0x29/0x70
>> +[  811.193021]  [<ffffffff816b521f>] io_schedule+0x8f/0xd0
>> +[  811.193028]  [<ffffffff811c683e>] sleep_on_buffer+0xe/0x20
>> +[  811.193037]  [<ffffffff816b3a1f>] __wait_on_bit+0x5f/0x90
>> +[  811.193044]  [<ffffffff811c5ef1>] ? submit_bh+0x121/0x1e0
>> +[  811.193051]  [<ffffffff811c6830>] ? __wait_on_buffer+0x30/0x30
>> +[  811.193058]  [<ffffffff816b3acc>] out_of_line_wait_on_bit+0x7c/0x90
>> +[  811.193067]  [<ffffffff8107eb00>] ? autoremove_wake_function+0x40/0x40
>> +[  811.193073]  [<ffffffff811c682e>] __wait_on_buffer+0x2e/0x30
>> +[  811.193085]  [<ffffffff8128aaf1>]
>> jbd2_journal_commit_transaction+0x1791/0x1960
>> +[  811.193093]  [<ffffffff816b62de>] ? _raw_spin_lock_irqsave+0x2e/0x40
>> +[  811.193102]  [<ffffffff81069fbf>] ? try_to_del_timer_sync+0x4f/0x70
>> +[  811.193109]  [<ffffffff8128e938>] kjournald2+0xb8/0x240
>> +[  811.193115]  [<ffffffff8107eac0>] ? add_wait_queue+0x60/0x60
>> +[  811.193120]  [<ffffffff8128e880>] ? commit_timeout+0x10/0x10
>> +[  811.193126]  [<ffffffff8107ded0>] kthread+0xc0/0xd0
>> +[  811.193132]  [<ffffffff8107de10>] ? flush_kthread_worker+0xb0/0xb0
>> +[  811.193139]  [<ffffffff816beaec>] ret_from_fork+0x7c/0xb0
>> +[  811.193144]  [<ffffffff8107de10>] ? flush_kthread_worker+0xb0/0xb0
>> +[  811.193228]
>> +[  811.193231] Restarting kernel threads ... done.
>> +[  811.193403] Restarting tasks ... done.
>>
>> Thanks Rafael for the hints and your patience!
>>
>> Hope TTY/FBDEV folks can help.
>>
>> IMPORTANT NOTE:
>> I have tested with some patches on top of Linux-Next (next-20130118),
>> see attached patches file!
>>
>
> This looks like a typo to me...
>
> --- a/drivers/tty/tty_buffer.c
> +++ b/drivers/tty/tty_buffer.c
> @@ -471,7 +471,7 @@ static void flush_to_ldisc(struct work_struct *work)
>         unsigned long   flags;
>         struct tty_ldisc *disc;
>
> -       tty = port->itty;
> +       tty = port->tty;
>         if (WARN_RATELIMIT(tty == NULL, "tty is NULL\n"))
>                 return;
>

[ CCing Ilya Zykov ]

This was not a good idea :-)!

Sounds like I am hitting what the patch "tty: Correct tty buffer
flush." from Ilya is trying to fix.
Unfortunately, his patch needs to be refreshed against latest tty-next!
I will try it when it is ready.

- Sedat -

[1] http://marc.info/?t=135452868300003&r=1&w=2

> - Sedat -
>
>> - Sedat -
>>
>>> Thanks,
>>> Rafael
>>>
>>>
>>> --
>>> I speak only for myself.
>>> Rafael J. Wysocki, Intel Open Source Technology Center.
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