On 02/23/13 01:09, Mauro Carvalho Chehab wrote:
> Em Fri, 22 Feb 2013 18:48:25 -0500
> Josh Boyer <jwboyer@xxxxxxxxxx> escreveu:
>
>> On Sat, Feb 23, 2013 at 12:29:24AM +0100, poma wrote:
>>> On 02/22/13 19:15, Bruno Wolff III wrote:
>>>> On Fri, Feb 22, 2013 at 10:17:17 -0500,
>>>> Josh Boyer <jwboyer@xxxxxxxxxx> wrote:
>>>>> Just a quick heads up that the 3.9 merge window kernels are being built
>>>>> in rawhide now. I've tried to at least test boot kernels on my machine
>>>>> before submitting them to koji, but testers beware. Merge window
>>>>> kernels can be tricky.
>>>>
>>>
>>> Euphemism for broken? ;)
>>
>> No. A euphemism for that would be "operationally challenged".
>>
>>>> I have git3 running on three machines and things seem fine. I'll be
>>>> trying out git5 very soon.
>>>
>>> Linux version 3.9.0-0.rc0.git5.1.fc19.x86_64
>>> (mockbuild@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx) (gcc version 4.8.0 20130220
>>> (Red Hat 4.8.0-0.14) (GCC) ) #1 SMP Fri Feb 22 16:35:19 UTC 2013
>>> …
>>> =============================================
>>> [ INFO: possible recursive locking detected ]
>>> 3.9.0-0.rc0.git5.1.fc19.x86_64 #1 Not tainted
>>> ---------------------------------------------
>>> kworker/0:1/36 is trying to acquire lock:
>>> (hdl->lock){+.+...}, at: [<ffffffffa042d745>] find_ref_lock+0x25/0x60
>>> [videodev]
>>>
>>> but task is already holding lock:
>>> (hdl->lock){+.+...}, at: [<ffffffffa0430888>]
>>> v4l2_ctrl_add_handler+0x78/0xf0 [videodev]
>>>
>>> other info that might help us debug this:
>>> Possible unsafe locking scenario:
>>>
>>> CPU0
>>> ----
>>> lock(hdl->lock);
>>> lock(hdl->lock);
>>>
>>> *** DEADLOCK ***
>>>
>>> May be due to missing lock nesting notation
>>>
>>> 3 locks held by kworker/0:1/36:
>>> #0: (events){.+.+.+}, at: [<ffffffff8108d870>]
>>> process_one_work+0x190/0x680
>>> #1: ((&wfc.work)){+.+.+.}, at: [<ffffffff8108d870>]
>>> process_one_work+0x190/0x680
>>> #2: (hdl->lock){+.+...}, at: [<ffffffffa0430888>]
>>> v4l2_ctrl_add_handler+0x78/0xf0 [videodev]
>>>
>>> stack backtrace:
>>> Pid: 36, comm: kworker/0:1 Not tainted 3.9.0-0.rc0.git5.1.fc19.x86_64 #1
>>> Call Trace:
>>> [<ffffffff810da843>] __lock_acquire+0x19e3/0x1a80
>>> [<ffffffff81021d69>] ? sched_clock+0x9/0x10
>>> [<ffffffff810acf15>] ? sched_clock_cpu+0xb5/0x100
>>> [<ffffffff810db092>] lock_acquire+0xa2/0x1f0
>>> [<ffffffffa042d745>] ? find_ref_lock+0x25/0x60 [videodev]
>>> [<ffffffff81711820>] mutex_lock_nested+0x80/0x3c0
>>> [<ffffffffa042d745>] ? find_ref_lock+0x25/0x60 [videodev]
>>> [<ffffffffa042d745>] ? find_ref_lock+0x25/0x60 [videodev]
>>> [<ffffffff810d8a7d>] ? trace_hardirqs_on_caller+0xfd/0x190
>>> [<ffffffffa042d745>] find_ref_lock+0x25/0x60 [videodev]
>>> [<ffffffffa042fce6>] handler_new_ref+0x46/0x1f0 [videodev]
>>> [<ffffffffa04308c7>] v4l2_ctrl_add_handler+0xb7/0xf0 [videodev]
>>> [<ffffffffa042a657>] v4l2_device_register_subdev+0x97/0x180 [videodev]
>>> [<ffffffffa04caa5e>] ivtv_gpio_init+0x13e/0x180 [ivtv]
>>> [<ffffffffa04c5cb4>] ivtv_probe+0x914/0x1bf0 [ivtv]
>>> [<ffffffff810d8904>] ? mark_held_locks+0xb4/0x130
>>> [<ffffffff81714636>] ? _raw_spin_unlock_irqrestore+0x36/0x70
>>> [<ffffffff810d8b1d>] ? trace_hardirqs_on+0xd/0x10
>>> [<ffffffff813890ae>] local_pci_probe+0x3e/0x70
>>> [<ffffffff810898a4>] work_for_cpu_fn+0x14/0x20
>>> [<ffffffff8108d8d9>] process_one_work+0x1f9/0x680
>>> [<ffffffff8108d870>] ? process_one_work+0x190/0x680
>>> [<ffffffff8108e0e1>] worker_thread+0x111/0x3c0
>>> [<ffffffff8108dfd0>] ? rescuer_thread+0x270/0x270
>>> [<ffffffff810938fd>] kthread+0xed/0x100
>>> [<ffffffff81093810>] ? insert_kthread_work+0x80/0x80
>>> [<ffffffff8171e16c>] ret_from_fork+0x7c/0xb0
>>> [<ffffffff81093810>] ? insert_kthread_work+0x80/0x80
>>> …
>>
>>> ------------[ cut here ]------------
>>> WARNING: at lib/dma-debug.c:947 check_for_stack+0xa0/0x100()
>>> …
>>> Pid: 38, comm: kworker/2:1 Not tainted 3.9.0-0.rc0.git5.1.fc19.x86_64 #1
>>> Call Trace:
>>> [<ffffffff81068670>] warn_slowpath_common+0x70/0xa0
>>> [<ffffffff810686ec>] warn_slowpath_fmt+0x4c/0x50
>>> [<ffffffff81378dd0>] check_for_stack+0xa0/0x100
>>> [<ffffffff81379180>] debug_dma_map_page+0x100/0x140
>>> [<ffffffff814e6fdb>] usb_hcd_map_urb_for_dma+0x55b/0x620
>>> [<ffffffff814e7335>] usb_hcd_submit_urb+0x295/0x8d0
>>> [<ffffffff810d625c>] ? lockdep_init_map+0x9c/0x470
>>> [<ffffffff814e8905>] usb_submit_urb+0x155/0x3d0
>>> [<ffffffff814e9274>] usb_start_wait_urb+0x74/0x190
>>> [<ffffffff814e9831>] usb_bulk_msg+0xc1/0x170
>>> [<ffffffffa058c646>] dvb_usbv2_generic_rw+0xc6/0x260 [dvb_usb_v2]
>>> [<ffffffffa05943be>] af9015_ctrl_msg+0x16e/0x260 [dvb_usb_af9015]
>>> [<ffffffff8136be2a>] ? debug_object_deactivate+0x8a/0x170
>>> [<ffffffffa0594bbc>] af9015_identify_state+0x3c/0x90 [dvb_usb_af9015]
>>> [<ffffffffa058b08d>] dvb_usbv2_init_work+0x6d/0x10e0 [dvb_usb_v2]
>>> [<ffffffff8108d8d9>] process_one_work+0x1f9/0x680
>>> [<ffffffff8108d870>] ? process_one_work+0x190/0x680
>>> [<ffffffff8108e0e1>] worker_thread+0x111/0x3c0
>>> [<ffffffff8108dfd0>] ? rescuer_thread+0x270/0x270
>>> [<ffffffff810938fd>] kthread+0xed/0x100
>>> [<ffffffff81093810>] ? insert_kthread_work+0x80/0x80
>>> [<ffffffff8171e16c>] ret_from_fork+0x7c/0xb0
>>> [<ffffffff81093810>] ? insert_kthread_work+0x80/0x80
>>> ---[ end trace b4a4208b0ed39626 ]---
>>
>> Mauro, any idea on these two?
>
> The first one looks to be a know issue: __initdev inside ivtv/cx18, is delaying
> initialization to happen after registering the device. There's a patch for it,
> pending upstream merge.
>
This one is gone after after applying
7d180f91eaabfbb813f1eda9e39e4445bfb826fc branch 'master' of
git://linuxtv.org/media_build
> The second one seems to be a bad lock. I think I saw some discussion about
> that at the media ML, but I can't remember the odd details. Perhaps there's
> a fix for it already. It should be noticed that there's a pending pull
> request with about ~600 patches for 3.9 that is pending its merge.
> The ivtv fix should be there. I hope Linus will merge it soon.
>
This one stayed;
…
------------[ cut here ]------------
WARNING: at lib/dma-debug.c:947 check_for_stack+0xa7/0xf0()
Hardware name: M720-US3
ehci-pci 0000:00:04.1: DMA-API: device driver maps memory fromstack
[addr=ffff8801283d7be1]
Modules linked in: dvb_usb_af9015(OF+)… dvb_usb_v2(OF)… dvb_core(OF)
wm8775(OF) tda9887(OF) tda8290(OF)… tuner(OF)… cx25840(OF)… bttv(OF+)…
rc_core(OF) btcx_risc(OF) ivtv(OF) snd_bt87x… videobuf_dma_sg(OF)
videobuf_core(OF)… cx2341x(OF) tveeprom(OF) v4l2_common(OF)…
videodev(OF)… video i2c_algo_bit… (irrelevant omitted)
Pid: 38, comm: kworker/2:1 Tainted: GF O
3.9.0-0.rc0.git5.1.fc18.x86_64 #1
Call Trace:
usb 4-2: pl2303 converter now attached to ttyUSB0
[<ffffffff81069b5f>] warn_slowpath_common+0x7f/0xc0
[<ffffffff81069c56>] warn_slowpath_fmt+0x46/0x50
[<ffffffff81386467>] check_for_stack+0xa7/0xf0
[<ffffffff81388228>] debug_dma_map_page+0x118/0x150
[<ffffffff814fa5d9>] usb_hcd_map_urb_for_dma+0x569/0x630
[<ffffffff811be091>] ? set_track+0x61/0x1b0
[<ffffffff814fa945>] usb_hcd_submit_urb+0x2a5/0x900
[<ffffffff810d814c>] ? lockdep_init_map+0xac/0x540
[<ffffffff814fc07f>] usb_submit_urb+0xff/0x3d0
[<ffffffff814fd042>] usb_start_wait_urb+0x82/0x1a0
[<ffffffff814fbdae>] ? usb_alloc_urb+0x1e/0x50
[<ffffffff814fd22c>] usb_bulk_msg+0xcc/0x180
[<ffffffffa05be7e8>] dvb_usbv2_generic_rw+0xd8/0x270 [dvb_usb_v2]
[<ffffffffa05cc5da>] af9015_ctrl_msg+0x1da/0x280 [dvb_usb_af9015]
[<ffffffff810ae7aa>] ? cpuacct_charge+0xfa/0x210
[<ffffffff810ae6c3>] ? cpuacct_charge+0x13/0x210
[<ffffffffa05ccb4c>] af9015_identify_state+0x3c/0x90 [dvb_usb_af9015]
[<ffffffffa05bcf18>] dvb_usbv2_init_work+0x68/0x11a0 [dvb_usb_v2]
[<ffffffff8108e36f>] ? process_one_work+0x19f/0x690
[<ffffffff8108e3db>] process_one_work+0x20b/0x690
[<ffffffff8108e36f>] ? process_one_work+0x19f/0x690
[<ffffffff8108ec10>] worker_thread+0x110/0x380
[<ffffffff8108eb00>] ? rescuer_thread+0x260/0x260
[<ffffffff8109569d>] kthread+0xed/0x100
[<ffffffff810955b0>] ? flush_kthread_worker+0x190/0x190
[<ffffffff8173882c>] ret_from_fork+0x7c/0xb0
[<ffffffff810955b0>] ? flush_kthread_worker+0x190/0x190
---[ end trace 4f4bc1c2abe300b5 ]---
--
Cheers,
poma
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