Bug 9980

Summary:	2.6.25-rc1 on Sun Ultra 40- HPET clocksource which causes it to hang
Product:	Platform Specific/Hardware	Reporter:	Rafael J. Wysocki (rjw)
Component:	x86-64	Assignee:	platform_x86_64 (platform_x86_64)
Status:	CLOSED CODE_FIX
Severity:	normal	CC:	mingo, tglx, yhlu.kernel
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:	2.6.25-rc1	Subsystem:
Regression:	Yes	Bisected commit-id:
Bug Depends on:
Bug Blocks:	9832

Description Rafael J. Wysocki 2008-02-13 16:18:02 UTC

Subject         : 2.6.25-rc1 on Sun Ultra 40
Submitter       : Jasper Bryant-Greene <jasper@unix.geek.nz>
Date            : 2008-02-13 12:25
References      : http://lkml.org/lkml/2008/2/13/181

This entry is being used for tracking a regression from 2.6.24.  Please don't
close it until the problem is fixed in the mainline or the report is rejected.

Comment 1 Rafael J. Wysocki 2008-02-24 16:10:48 UTC

Handled-By : Yinghai Lu <Yinghai.Lu@sun.com>

Comment 2 Natalie Protasevich 2008-03-11 18:30:37 UTC

On Thu, 2008-02-14 at 00:25 +1300, Jasper Bryant-Greene wrote:
> I have been attempting to test 2.6.25-rc1 on my Sun Ultra 40 (two
> dual-core Opteron 2222 CPUs).
> 
> There is some issue with the HPET clocksource which causes it to hang
> the boot process if enabled, which I will look into in due course (the
> HPET works fine on at least 2.6.19).
> 
> More pressing is that the system will not boot at all even with HPET
> disabled - kernel gets no further than "NET: Registered protocol family
> 2".
> 
> I cannot think of a way to find out what the problem is, because the
> system has only USB ports, and the USB keyboard is not working at this
> stage, either because the system has locked up hard, or because the USB
> support has not yet loaded (I tried both standard USB-HID and boot
> protocol keyboard support, both compiled in). Thus I cannot use
> magic-sysrq, or even scrollback to look at boot messages. There is also
> no serial port to assist with the latter...

I can confirm neither the boot hang with HPET enabled nor the other
unexplained boot hang after "NET: Registered protocol family 2" occur on
2.6.24.2 on the same hardware. I still don't have an appropriate way to
debug the issue on 2.6.25-rc1, though...

Comment 3 Yinghai Lu 2008-03-12 22:49:50 UTC

boot log and config please

Comment 4 Rafael J. Wysocki 2008-04-06 13:48:01 UTC

References : http://lkml.org/lkml/2008/4/6/72

Jasper Bryant-Greene said:

No longer reproducible on 2.6.25-rc8.