linux-kernel - Re: 2.6.25-rc5: Reported regressions from 2.6.24

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Message-ID: <47E0D9A7.1040308@s5r6.in-berlin.de>
Date:	Wed, 19 Mar 2008 10:15:19 +0100
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	Thomas Meyer <thomas@...3r.de>
CC:	Adrian Bunk <bunk@...nel.org>, "Rafael J. Wysocki" <rjw@...k.pl>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Natalie Protasevich <protasnb@...il.com>
Subject: Re: 2.6.25-rc5: Reported regressions from 2.6.24

Thomas Meyer wrote:
> Adrian Bunk schrieb:
>> On Tue, Mar 11, 2008 at 01:22:42PM +0100, Stefan Richter wrote:
>>  
>>> Rafael J. Wysocki wrote:
>>>    
>>>> Bug-Entry    : http://bugzilla.kernel.org/show_bug.cgi?id=10080

I have reopened, re-assigned, and slightly renamed that bug now.

>>>> Subject        : 2.6.25-rc2: ohci1394 problem
>>>> Submitter    : Thomas Meyer <thomas@...3r.de>
>>>> Date        : 2008-02-20 08:47
>>>> References    : http://lkml.org/lkml/2008/2/20/58
>>>> Handled-By    : Stefan Richter <stefanr@...6.in-berlin.de>

This bug is not handled by me.

>>>>       
>>> Thomas wrote on 2008-02-25:
>>> ''So i did a "make clean" and a "make" (not a make
>>> -j3 as i use to do) and recompiled 2.6.25-rc3 and now it works again.
>>> Case closed under strange error.''
>>> ...
>>>     
>>
>> Although I don't think this would cause the error, it would be nice if 
>> Thomas could verify that the -j3 did not cause the problem.
>>   
> I still cannot *believe* this bug, but  i just checked out the latest 
> kernel and did a make distclean and a make (with mr. bunks patch 
> applied) and there it is again:
> $ dmesg
> 
> (cut)
> [  464.852986] ohci1394: fw-host0: physical posted write error
[...]
> [  464.898957] ohci1394: fw-host0: Unhandled interrupt(s) 0xfc7cfe0c
> and so on....
> 
> $ git describe
> v2.6.25-rc6-14-gbde4f8f
> 
> As i already wrote: I tried to bisect this behavior, but with no result.
> 
> And Stefan didn't change anything in the involved drivers. I have no 
> idea what could cause this kind of bug!

The messages which Thomas posted result from ohci1394 getting ~0 (i.e. 
0xffffffff) from some or all MMIO reads.  This is not a FireWire driver bug.

MMIO has been broken by something after 2.6.24.
-- 
Stefan Richter
-=====-==--- --== =--==
http://arcgraph.de/sr/
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