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

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Date:	Thu, 5 Sep 2013 14:13:56 -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:
 > On Thu, Sep 05, 2013 at 01:19:45AM -0400, Dave Jones wrote:
 > > Got it. (I think I was getting tracebacks from multiple cpus, hence
 > > the spewing). Adding a check for tainted() = infinite loop to
 > > show_backtrace() combined with boot_delay gave me a really long oops
 > > that I had to grab video to record.
 > 
 > How complete is this trace?  If accurate, I suspect that this is an oops
 > caused by the timer expiring, but the memory associated with the timer
 > has already been overwritten.  That would make it particularly hard to
 > debug.

There were some '?' symbols in the trace too which I omitted last night.
(offsets left out, because I'm hand-transcribing from video) 

<IRQ>
? call_timer_fn
? call_timer_fn
run_timer_softirq
__do_softirq
irq_exit
smp_apic_timer_interrupt
apic_timer_interrupt
<EOI>
? touch_nmi_watchdog
? touch_nmi_watchdog
vprintk_emit
? create_syslog_header
dev_vprintk_emit
? dump_trace
? trace_hardirqs_off_caller
? trace_hardirqs_off_caller
dev_print_emit
? trace_hardirqs_off_caller
__dev_printk
_dev_info
? trace_hardirqs_off
ahci_print_info
ahci_init_one
local_pci_probe
pci_device_probe
driver_probe_device
__driver_attach
? __device_attach
bus_for_each_dev
driver_attach
bus_add_driver
? ata_sff_init
driver_register
__pci_register_driver
ahci_pci_driver_init
do_one_initcall
? parse_args
kernel_init_freeable
? do_early_param
? rest_init
kernel_init
ret_from_fork
? rest_init

 > Maybe the patch below will allow Dave to boot to a prompt and capture
 > the full dmesg - I've only just cooked up this patch so it may need
 > a bit of work to get it to build.  Please ensure that kobject debugging
 > is enabled, so we can translate from kobject addresses to names.
 > 
 > Dave - thanks for your patience and effort in trying to track this down.
 > Hopefully the patch below will make it easier.

building now.

Thanks,

	Dave

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