Re: [Xen-devel] [xen] double fault: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC

[Ingo Molnar <mingo@xxxxxxxxxx>]

* Fengguang Wu <fengguang.wu@xxxxxxxxx> wrote:

> After enabling CONFIG_DEBUG_OBJECTS_TIMERS=y, it will issue a WARNING 
> followed by a "BUG: ..."

Cool!

> [    2.802167] parport_pc 00:04: reported by Plug and Play ACPI
> [    2.803818] parport0: PC-style at 0x378, irq 7 [PCSPP(,...)]
> [    2.806035] kobject: 'parport_pc.956' (ffff880006dc3820): kobject_release, 
> parent           (null) (delayed)
> [    2.808626] ------------[ cut here ]------------                           
>                                  
> [    2.809776] WARNING: CPU: 1 PID: 1 at /c/wfg/linux/lib/debugobjects.c:260 
> debug_print_object+0x7c/0x8d()
> [    2.812433] ODEBUG: init active (active state 0) object type: timer_list 
> hint:           (null)         
> ......
> [    3.796079] BUG: unable to handle kernel NULL pointer dereference at       
>     (null)

Mind posting the full backtrace? It should show the actual callsite that 
zaps the timer. I don't think we got that dump so far, I've only seen 
timer list corruption backtraces. (but I haven't read the whole thread.)

Thanks,

        Ingo

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