Documentation/BUG-HUNTING whitespace cleanup
Just a little whitespace cleanup patch for Documentation/BUG-HUNTING Signed-off-by: Clemens Koller <clemens.koller@anagramm.de> Acked-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Adrian Bunk <bunk@kernel.org>
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@ -53,7 +53,7 @@ Finding it the old way
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[Sat Mar 2 10:32:33 PST 1996 KERNEL_BUG-HOWTO lm@sgi.com (Larry McVoy)]
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This is how to track down a bug if you know nothing about kernel hacking.
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This is how to track down a bug if you know nothing about kernel hacking.
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It's a brute force approach but it works pretty well.
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You need:
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@ -66,12 +66,12 @@ You will then do:
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. Rebuild a revision that you believe works, install, and verify that.
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. Do a binary search over the kernels to figure out which one
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introduced the bug. I.e., suppose 1.3.28 didn't have the bug, but
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introduced the bug. I.e., suppose 1.3.28 didn't have the bug, but
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you know that 1.3.69 does. Pick a kernel in the middle and build
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that, like 1.3.50. Build & test; if it works, pick the mid point
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between .50 and .69, else the mid point between .28 and .50.
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. You'll narrow it down to the kernel that introduced the bug. You
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can probably do better than this but it gets tricky.
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can probably do better than this but it gets tricky.
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. Narrow it down to a subdirectory
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@ -81,27 +81,27 @@ You will then do:
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directories:
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Copy the non-working directory next to the working directory
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as "dir.63".
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as "dir.63".
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One directory at time, try moving the working directory to
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"dir.62" and mv dir.63 dir"time, try
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"dir.62" and mv dir.63 dir"time, try
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mv dir dir.62
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mv dir.63 dir
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find dir -name '*.[oa]' -print | xargs rm -f
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And then rebuild and retest. Assuming that all related
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changes were contained in the sub directory, this should
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isolate the change to a directory.
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changes were contained in the sub directory, this should
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isolate the change to a directory.
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Problems: changes in header files may have occurred; I've
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found in my case that they were self explanatory - you may
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found in my case that they were self explanatory - you may
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or may not want to give up when that happens.
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. Narrow it down to a file
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- You can apply the same technique to each file in the directory,
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hoping that the changes in that file are self contained.
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hoping that the changes in that file are self contained.
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. Narrow it down to a routine
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- You can take the old file and the new file and manually create
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@ -130,7 +130,7 @@ You will then do:
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that makes the difference.
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Finally, you take all the info that you have, kernel revisions, bug
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description, the extent to which you have narrowed it down, and pass
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description, the extent to which you have narrowed it down, and pass
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that off to whomever you believe is the maintainer of that section.
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A post to linux.dev.kernel isn't such a bad idea if you've done some
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work to narrow it down.
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