Messages in this thread | | | Date | Mon, 6 Sep 2010 22:51:10 -0400 | From | Ted Ts'o <> | Subject | Re: help with git bisecting a bug 16376: random - possibly Radeon DRM KMS related - freezes |
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On Sun, Sep 05, 2010 at 09:53:41AM +0200, Martin Steigerwald wrote: > > Quite some kernels were unbootable with an ext4 and readahead related > backtrace[1].
Unfortunately, you don't have a full backtrace in the picture which submitted as an attachment to the bugzilla. It shows part of the backtrace which has an ext4 and readahead stack, yes. But we didn't get to see the beginning of the stack trace with the IP and the reason for the oops. If keyboard interrupts still work, you might try seing if you can scroll upwards and see more of the backtrace. Or you might try configuring your console to use a higher resolution display so more lines can be displayed. Or you might try getting a serial console.
I don't recognize the display, but the problem could just as easily be in the block layer or in the device driver for your hard drive. (i.e., the readahead stack calls ext4, which in turn will submit a read request to the block device layer which then submits the request to a device driver).
But because you keep referring it to it as an ext4/readahead related backtrace, you may have disguised the symptom enough that people who might recognize it as, "Oh, yeah, there was this regression in the SATA layer", wouldn't recognize it as such from your description. That's why it's important to be careful how you describe issues; if you had said, I don't have a complete stack trace, and I don't have the IP and function where the fault occurred, that might have caused people to think a bit harder about what might be the problem, instead of thinking to themselves, "ah, well, the ext4 and readahead parts of the kernel aren't my problem, so I'll ignore this report".
> I am also seeking help with selecting more suitable commits to test: If > its a Radeon KMS related freeze and everything points at it, I think the > offending commit is in the first quarter of what git commit shows to me[2].
You do know that you can restrict a git bisect to commits that modify a particular part of the tree, right? e.g.,
git bisect start 2.6.34 2.6.33 -- drivers/gpu/drm/radeon
- Ted
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