Messages in this thread | | | Date | Mon, 5 Sep 2005 01:45:28 -0700 (PDT) | From | Linus Torvalds <> | Subject | Re: rc5 seemed to kill a disk that rc4-mm1 likes. Also some X trouble. |
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On Mon, 5 Sep 2005, Rolf Eike Beer wrote: > > The problem appeared between 2.6.12-git3 and 2.6.12-git4.
Just for reference, that's git ID's
1d345dac1f30af1cd9f3a1faa12f9f18f17f236e..2a5a68b840cbab31baab2d9b2e1e6de3b289ae1e
and that's 225 commits and the diff is 55,781 lines long.
It would be very good if you could try to use raw git and narrow it down a bit more. It's really easy these days with a recent git version, just do
git bisect start git bisect good 1d345dac1f30af1cd9f3a1faa12f9f18f17f236e git bisect bad 2a5a68b840cbab31baab2d9b2e1e6de3b289ae1e
and off you go.. That will select a new kernel for you to try, which basically cuts down the commits to ~110 - and if you can test just a few kernels and binary-search a bit more, we'd have it down to just a couple.
If you want to try work smarter (rather than a brute-force binary search thing), this command line:
git-whatchanged -p \ 1d345dac1f30af1cd9f3a1faa12f9f18f17f236e..2a5a68b840cbab31baab2d9b2e1e6de3b289ae1e \ drivers/video
will actually give you some very good information on what to try (I forget your exact original problem - I'm writing this from Italy, and I don't have my full email archives here. It was some MGA card that stopped working, no? Or was there something else?).
Anyway, git users really have a lot of nifty tools to help chase down bugs like this. I used that "git bisect" thing twice myself last week. And the "git-whatchanged" thing really is pretty flexible: as you can see, you can limit it to both a range of commits and a certain subdirectory (or a _set_ of subdirectories and/or individual files - you can have as many pathname limits as you want).
And that "-p" thing makes it show the whole diff for the thing (replace if with a "-s" if you just want to see the descriptions and be silent about the actual diff).
All in my never-ending quest to make people more aware of how they can use git to pinpoint the source of kernel bugs.
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