linux-kernel - Regression in 32-bit ppc kernel

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Message-ID: <4F973026.3020103@lwfinger.net>
Date:	Tue, 24 Apr 2012 17:58:46 -0500
From:	Larry Finger <Larry.Finger@...inger.net>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>
CC:	linuxppc-dev@...ts.ozlabs.org, LKML <linux-kernel@...r.kernel.org>
Subject: Regression in 32-bit ppc kernel

Hi,

Somewhere between v3.2 and v3.3, the kernel in my Powerbook G4 started issuing 
the following traceback on bootup:

[   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

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