linux-kernel - Re: [BUG] usb problems in .38-rc3+

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Message-Id: <201102120938.45728.edt@aei.ca>
Date:	Sat, 12 Feb 2011 09:38:45 -0500
From:	Ed Tomlinson <edt@....ca>
To:	Anand Gadiyar <gadiyar@...com>
Cc:	Oliver Neukum <oneukum@...e.de>, linux-kernel@...r.kernel.org,
	linux-bluetooth@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [BUG] usb problems in .38-rc3+

On Wednesday 09 February 2011 01:17:40 Anand Gadiyar wrote:
> Ed Tomlinson wrote:
> > On Tuesday 08 February 2011 01:46:16 Gadiyar, Anand wrote:
> > > On Tue, Feb 8, 2011 at 7:45 AM, Ed Tomlinson <edt@....ca> wrote:
> > > > I tried bisecting without much luck.  It started with about 4000
> commits to check.  It was still bad
> > > > when it reached the first 1000 commits post .37.  Then all boots
> started crashing.  I think its possible
> > > > to restrict a bisect to a directory - if so, what dir should I try?
> > > >
> > >
> > > Maybe drivers/ or drivers/usb would be enough for a first attempt?
> > > I usually start there.
> > >
> > > You could just do:
> > >
> > > git bisect start -- [path]
> > >
> > > to restrict bisection to commits that touch [path].
> >
> > This is as far as I can get:
> >
> > # bad: [100b33c8bd8a3235fd0b7948338d6cbb3db3c63d] Linux 2.6.38-rc4
> > # good: [3c0eee3fe6a3a1c745379547c7e7c904aa64f6d5] Linux 2.6.37
> > # good: [387c31c7e5c9805b0aef8833d1731a5fe7bdea14] Linux 2.6.37-rc8
> > # good: [90a8a73c06cc32b609a880d48449d7083327e11a] Linux 2.6.37-rc7
> > # good: [c8ddb2713c624f432fa5fe3c7ecffcdda46ea0d4] Linux 2.6.37-rc1
> > git bisect start 'v2.6.38-rc4' 'v2.6.37' 'v2.6.37-rc8' 'v2.6.37-rc7'
> 'v2.6.37-rc1' '--' 'drivers/usb' 'drivers/bluetooth'
> > # good: [5cdc5bd8b2b1190cb54548c03194b154b4892e2a] Merge branch
> 'musb-hw' of git://gitorious.org/usb/usb into musb
> > git bisect good 5cdc5bd8b2b1190cb54548c03194b154b4892e2a
> > # bad: [f2c565e223af39ed38be5c84b1a37b591b22db83] xHCI: replace
> dev_dbg() with xhci_dbg()
> > git bisect bad f2c565e223af39ed38be5c84b1a37b591b22db83
> > # good: [2af10844eb6ed104f9505bf3a7ba3ceb02264f31] USB: Merge 2.6.37-rc5
> into usb-next
> > git bisect good 2af10844eb6ed104f9505bf3a7ba3ceb02264f31
> > # bad: [3e5b08cbbf78bedd316904ab0cf3b27119433ee5] Merge branch
> 'usb-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb-2.6
> > git bisect bad 3e5b08cbbf78bedd316904ab0cf3b27119433ee5
> > # good: [1051b9f0f9eab8091fe3bf98320741adf36b4cfa] Merge branch
> 'for-rmk' of git://git.pengutronix.de/git/imx/linux-2.6 into devel-stable
> > git bisect good 1051b9f0f9eab8091fe3bf98320741adf36b4cfa
> >
> > After this the kernel does not build.
> >
> > Any clues?
> 
> Is it easier to just fix the build break locally and proceed?
> 
> I'm afraid I don't know how to skip a step during bisection.
> I try narrowing things down manually.
> 
> Given that 2.6.37 is fine, can you check if v2.6.38-rc1 works?
> If it doesn't work, then this break was caused by something that
> went in during the merge window (which I believe is most likely).
> 
> You may be able to get somewhere by using snapshots of
> linux-next as of particular days. They are available at [1]
> as a single patch against a tag from Linus' tree.
> 
> Warning: This could be tedious, maybe not much more than a
> git-bisect. Maybe easier to try and work it out from the
> code.

I am not having much luck bisecting or using daily snapshots.  They either
do not build or opps during boot....

The latest round of usb fixes (67d019528e5c2693145217cf18a507689980d2a4) from 
Greg did not help 

How else can we track this down?

Ed
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