Regression in 32-bit ppc kernel

[Benjamin Herrenschmidt]

On Tue, 2012-04-24 at 17:58 -0500, Larry Finger wrote:
> Hi,
> 
> Somewhere between v3.2 and v3.3, the kernel in my Powerbook G4 started issuing 
> the following traceback on bootup:

Does it continue working afterward or not at all ?

Are you using the old IDE driver or the newer libata based pata_macio ?

Cheers,
Ben.

> [   40.264006] irq 23: nobody cared (try booting with the "irqpoll" option)
> [   40.264031] Call Trace:
> [   40.264070] [dfff3f00] [c000984c] show_stack+0x7c/0x194 (unreliable)
> [   40.264102] [dfff3f40] [c00a6840] __report_bad_irq+0x44/0xf4
> [   40.264119] [dfff3f60] [c00a6adc] note_interrupt+0x1ec/0x2ac
> [   40.264135] [dfff3f80] [c00a48a8] handle_irq_event_percpu+0x250/0x2b8
> [   40.264152] [dfff3fd0] [c00a4944] handle_irq_event+0x34/0x54
> [   40.264169] [dfff3fe0] [c00a7514] handle_fasteoi_irq+0xb4/0x124
> [   40.264192] [dfff3ff0] [c000f5bc] call_handle_irq+0x18/0x28
> [   40.264208] [dec85ce0] [c000719c] do_IRQ+0x114/0x1cc
> [   40.264226] [dec85d10] [c0015868] ret_from_except+0x0/0x1c
> [   40.264254] --- Exception: 501 at find_vma+0x10/0x80
> [   40.264259]     LR = do_page_fault+0x26c/0x6ac
> [   40.264272] [dec85dd0] [c03f0128] do_page_fault+0x25c/0x6ac (unreliable)
> [   40.264289] [dec85f40] [c00155e4] handle_page_fault+0xc/0x80
> [   40.264327] --- Exception: 301 at 0x4800a174
> 
> The problem still exists in v3.4-rc3. I am currently doing a bisection of this 
> problem, but it will take a long time to complete.
> 
> Note: IRQ 23 is not active in v3.2.
> 
> Thanks,
> 
> Larry