linux-kernel - Re: kobject: delayed kobject release: help find buggy drivers

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Date:	Thu, 5 Sep 2013 15:29:17 -0400
From:	Dave Jones <davej@...hat.com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Greg KH <gregkh@...uxfoundation.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: kobject: delayed kobject release: help find buggy drivers

On Thu, Sep 05, 2013 at 06:35:40PM +0100, Russell King - ARM Linux wrote:

 > Dave - thanks for your patience and effort in trying to track this down.
 > Hopefully the patch below will make it easier.

I'm not sure if this is happening because I enabled DEBUG_KOBJECT this time around
or not, but now I'm seeing a different trace. (same hang though)

serial8250: ttyS0 at I/O 0x3f8 (ieq =4, base_baud = 115200) is 16550A
Oops
RIP: kobject_release
trace:

kobject_put
cdev_del
tty_unregister_device
uart_remove_one_port
serial8250_register_8250_port
pciserial_init_ports
pciserial_init_one
local_pci_probe
pci_device_probe
driver_probe_device
__driver_attach
? __device_attach
bus_for_each_dev
driver_attach
bus_add_driver
? early_serial_setup
driver_register
? early_serial_setup
__pci_register_driver
serial_pci_driver_init
do_one_initcall

Trying without serial console next..

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