3.9 merge window kernels

[poma]

On 02/22/13 19:15, Bruno Wolff III wrote:
> On Fri, Feb 22, 2013 at 10:17:17 -0500,
>   Josh Boyer <jwboyer at redhat.com> 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? ;)

> 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 at bkernel01.phx2.fedoraproject.org) (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 ]---
…


Cheers,
poma