Hang after usb on EdgeRouter Lite

[Joe Holden]

ok so, just built new HEAD with DDB, WITNESS etc to get a backtrace but 
alas, now it's booting fine... who unbroke it? :)

On 19/08/2013 00:44, Ian Lepore wrote:
> Olivier made some changes to unbreak the arm stuff right after that
> commit.  Given that some of the mips code evolved from the arm code,
> maybe there are clues in what he did for arm.
>
> -- Ian
>
> On Sun, 2013-08-18 at 15:18 -0700, Juli Mallett wrote:
>> I looked at that change recently, and it changed how kstacks are allocated
>> at least, and while it should have preserved the right alignment behaviour,
>> I'm wondering now if there may be some subtler problem in the change there
>> now.  There were other changes that could be implicated as part of that
>> commit, but that's the bit that immediately set off some alarm for me,
>> because I know MIPS is an unusual case in that regard.  (Requiring kstacks
>> to fill up a whole double-TLB entry.)
>>
>> Thanks for tracking this down, and I'm hopeful that Jeff will have some
>> insight.  Thanks to Adrian for following up with him.
>>
>> Juli.
>>
>>
>> On Sun, Aug 18, 2013 at 3:01 PM, Adrian Chadd <adrian at freebsd.org> wrote:
>>
>>> Ok. I just replied to Jeff's commit and CC'ed you.
>>>
>>> Let's see if we can work with Jeff to figure out why the hell it broke and
>>> get it fixed up before 10.0-REL is cut.
>>>
>>> Would you please file a PR with all the relevant information that you've
>>> found?
>>>
>>> Thanks!
>>>
>>>
>>>
>>> -adrian
>>>
>>>
>>> On 18 August 2013 14:33, Joe Holden <lists at rewt.org.uk> wrote:
>>>
>>>> Ok so r254025 is definitely the commit that broke it (both SMP *and*
>>> USB) -
>>>> looks like the commit is quite involved so won't be particularly easy to
>>>> unbreak just mips (at least for me) :(
>>>>
>>>>> -----Original Message-----
>>>>> From: owner-freebsd-mips at freebsd.org [mailto:owner-freebsd-
>>>>> mips at freebsd.org] On Behalf Of Joe Holden
>>>>> Sent: 18 August 2013 21:42
>>>>> To: 'Adrian Chadd'
>>>>> Cc: freebsd-mips at freebsd.org
>>>>> Subject: RE: Hang after usb on EdgeRouter Lite
>>>>>
>>>>> ... and it boot with the second core disabled (usb still broken
>>> though) -
>>>>> something has gone horribly wrong :P
>>>>>
>>>>>> -----Original Message-----
>>>>>> From: owner-freebsd-mips at freebsd.org [mailto:owner-freebsd-
>>>>>> mips at freebsd.org] On Behalf Of Joe Holden
>>>>>> Sent: 18 August 2013 21:30
>>>>>> To: 'Adrian Chadd'
>>>>>> Cc: freebsd-mips at freebsd.org
>>>>>> Subject: RE: Hang after usb on EdgeRouter Lite
>>>>>>
>>>>>> Sigh. it's actually getting worse - r254025 hangs after ULE setup.
>>>>>>
>>>>>>
>>>>>>
>>>>>> This may take longer than I first thought
>>>>>>
>>>>>>
>>>>>>
>>>>>> From: adrian.chadd at gmail.com [mailto:adrian.chadd at gmail.com] On
>>>>> Behalf
>>>>>> Of Adrian Chadd
>>>>>> Sent: 18 August 2013 20:27
>>>>>> To: Joe Holden
>>>>>> Cc: Warner Losh; freebsd-mips at freebsd.org
>>>>>> Subject: Re: Hang after usb on EdgeRouter Lite
>>>>>>
>>>>>>
>>>>>>
>>>>>> .. you can just disable those for now. You're debugging USB hangs,
>>> not
>>>>>> bootp/nfs compile problems. :0
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> -adiran
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> On 18 August 2013 11:19, Joe Holden <lists at rewt.org.uk
>>>>>> <mailto:lists at rewt.org.uk> > wrote:
>>>>>>
>>>>>> None yet - getting compilation problems when building with BOOTP and
>>>>>> NFS root (undefined references)
>>>>>>
>>>>>>
>>>>>>> -----Original Message-----
>>>>>>> From: Warner Losh [mailto:wlosh at bsdimp.com
>>>>>> <mailto:wlosh at bsdimp.com> ]
>>>>>>> On
>>>>>> Behalf Of Warner Losh
>>>>>>> Sent: 18 August 2013 07:41
>>>>>>> To: Adrian Chadd
>>>>>>> Cc: Joe Holden; freebsd-mips at freebsd.org
>>>>>>> <mailto:freebsd-mips at freebsd.org>
>>>>>>
>>>>>>> Subject: Re: Hang after usb on EdgeRouter Lite
>>>>>>>
>>>>>>>
>>>>>>
>>>>>>> On Aug 16, 2013, at 12:12 PM, Adrian Chadd wrote:
>>>>>>>> On 16 August 2013 01:56, Joe Holden <lists at rewt.org.uk
>>>>>> <mailto:lists at rewt.org.uk> > wrote:
>>>>>>>>> Not getting much closer but so far 253367 works, 253845 and
>>> later
>>>>>>>>> don't, I can't see any mips-specific changes that might break it
>>>>>>>>> but I
>>>>>> may
>>>>>>> be wrong!
>>>>>>>>
>>>>>>>> Plenty of non-MIPS stuff does break MIPS. :)
>>>>>>>
>>>>>>> Any new news?
>>>>>>>
>>>>>>> Warner
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
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