On 02/22/13 19:15, Bruno Wolff III wrote:
On Fri, Feb 22, 2013 at 10:17:17 -0500,
Josh Boyer <jwboyer(a)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(a)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