2010-08-31 19:53:52

by Martin Steigerwald

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Subject: help with git bisecting a bug 16376: random - possibly Radeon DRM KMS related - freezes


Hi!

I am seeking help with encircling the cause of:

[Bug 16376] random - possibly Radeon DRM KMS related - freezes
https://bugzilla.kernel.org/show_bug.cgi?id=16376

I started a bisection as described in which has been painful for me - at
least for a first time bisection -, but after the second skip of a non-
booting kernel git points me to a kernel that is outside of the initial
range between good and back.

good is: [60b341b778cc2929df16c0a504c91621b3c6a4ad] Linux 2.6.33

bad is: bad: [64ba9926759792cf7b95f823402e2781edd1b5d4] Merge branch 'for-
linus' of git://git.open-osd.org/linux-open-osd

After skipping the last non booting kernel, git bisect put me to
5be796f0b842c5852d7397a82f8ebd6be8451872 which is just 300 lines after
2.6.33-rc2.

Obviously I am not interested in kernels prior 2.6.33. Should I just do a
"git bisect good" without trying the kernel or is there some other remedy?
its 11 cycles already without testing anything outside the initial
good/bad range and it takes about half a day to be somewhat sure that a
kernel is good, so I'd like to avoid testing versions outside this range.

My bug comment #35 contains a log of the bisection[1].

[1] https://bugzilla.kernel.org/show_bug.cgi?id=16376#c35

Ciao,
--
Martin 'Helios' Steigerwald - http://www.Lichtvoll.de
GPG: 03B0 0D6C 0040 0710 4AFA B82F 991B EAAC A599 84C7


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2010-08-31 22:39:26

by Ken Moffat

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Subject: Re: help with git bisecting a bug 16376: random - possibly Radeon DRM KMS related - freezes

On Tue, Aug 31, 2010 at 09:53:43PM +0200, Martin Steigerwald wrote:
>
> Hi!
>
> I am seeking help with encircling the cause of:
>
> [Bug 16376] random - possibly Radeon DRM KMS related - freezes
> https://bugzilla.kernel.org/show_bug.cgi?id=16376
>
> I started a bisection as described in which has been painful for me - at
> least for a first time bisection -, but after the second skip of a non-
> booting kernel git points me to a kernel that is outside of the initial
> range between good and back.
>
> good is: [60b341b778cc2929df16c0a504c91621b3c6a4ad] Linux 2.6.33
>
> bad is: bad: [64ba9926759792cf7b95f823402e2781edd1b5d4] Merge branch 'for-
> linus' of git://git.open-osd.org/linux-open-osd
>
> After skipping the last non booting kernel, git bisect put me to
> 5be796f0b842c5852d7397a82f8ebd6be8451872 which is just 300 lines after
> 2.6.33-rc2.
>
> Obviously I am not interested in kernels prior 2.6.33. Should I just do a
> "git bisect good" without trying the kernel or is there some other remedy?
> its 11 cycles already without testing anything outside the initial
> good/bad range and it takes about half a day to be somewhat sure that a
> kernel is good, so I'd like to avoid testing versions outside this range.

While you are bisecting, don't believe the version in Makefile. I
got similarly freaked out a couple of years ago - if I understood
correctly, it's something to do with when a change was created.

The key point is that during bisection the apparent version *can*
go back to a version that appears to be before the initial "good"
kernel.

ken
--
das eine Mal als Trag?die, das andere Mal als Farce