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From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Mikael Pettersson <mikpe@csd.uu.se>
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Date: Sun, 23 Jan 2005 11:43:56 +1100
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Cc: linuxppc-dev list <linuxppc-dev@ozlabs.org>,
	Paul Mackerras <paulus@samba.org>,
	Linux Kernel list <linux-kernel@vger.kernel.org>
Subject: Re: BUG: 2.6.11-rc2 and -rc1 hang during boot on PowerMacs
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On Sat, 2005-01-22 at 18:23 +0100, Mikael Pettersson wrote:
> Kernels 2.6.11-rc2 and -rc1 hang during boot on my Beige PowerMac G3.
> The last kernel message on the console is:
> 
> adb: starting probe task...
> 
> At this point the kernel hangs and doesn't respond to any attempt
> to invoke SYSRQ or XMON. Normally the subsequent messages would be:
> 
> adb devices: [2]: 2 5 [3]: 3 1
> ADB keyboard at 2, handler set to 3
> Detected ADB keyboard, type ISO, swapping keys.
> input: ADB keyboard on adb2:2.05/input
> ADB HID on ID 3 not yet registered
> ADB mouse at 3, handler set to 2
> input: ADB mouse on adb3:3.01/input
> adb: finished probe task...
> 
> The 2.6.11-rc1 kernel also hung on an eMac (G4). On that machine it
> appears the hang occurred in radeonfb: the screen flickers off/on
> during radeonfb initialisation, but with 2.6.11-rc1 the screen just
> went black. Afterwards the eMac did not respond to any keyboard or
> network activity, so I have to assume it hung hard.
> 
> I've traced the cause of the hangs to a local_irq_disable() added to
> init/main.c:rest_init() in 2.6.10-bk12. Removing it eliminates the
> hangs on both the G3 and the eMac:

I know about this problem, I'm working on a proper fix. Thanks for your
report.

Ben.