Re: [bug] SLUB + mm/slab.c boot crash in -rc9



On Tue, 15 Apr 2008, Ingo Molnar wrote:

quite. Here are all the successfull bootups from my (failed) bisection
attempt:

0773769191d943358a8392fa86abd756d004c4b6
21af0297c7e56024a5ccc4d8ad2a590f9ec371ba
26b8256e2bb930a8e4d4d10aa74950d8921376b8
2a10e7c41254941cac87be1eccdcb6379ce097f5
3aa88cdf6bcc9e510c0707581131b821a7d3b7cb
49914084e797530d9baaf51df9eda77babc98fa8
53a6e2342d73d509318836e320f70cd286acd69c
5be3bda8987b12a87863c89b74b136fdb1f072db
6d5f718a497375f853d90247f5f6963368e89803
7272dcd31d56580dee7693c21e369fd167e137fe
77de2c590ec72828156d85fa13a96db87301cc68
82cfbb008572b1a953091ef78f767aa3ca213092
b75f53dba8a4a61fda1ff7e0fb0fe3b0d80e0c64
c087567d3ffb2c7c61e091982e6ca45478394f1a
d4b37ff73540ab90bee57b882a10b21e2f97939f
fde1b3fa947c2512e3715962ebb1d3a6a9b9bb7d

Ok, can you try this script

git bisect start
git bisect bad 7fa2ac3728ce828070fa3d5846c08157fe5ef431
git bisect good 0773769191d943358a8392fa86abd756d004c4b6
git bisect good 21af0297c7e56024a5ccc4d8ad2a590f9ec371ba
git bisect good 26b8256e2bb930a8e4d4d10aa74950d8921376b8
git bisect good 2a10e7c41254941cac87be1eccdcb6379ce097f5
git bisect good 3aa88cdf6bcc9e510c0707581131b821a7d3b7cb
git bisect good 49914084e797530d9baaf51df9eda77babc98fa8
git bisect good 53a6e2342d73d509318836e320f70cd286acd69c
git bisect good 5be3bda8987b12a87863c89b74b136fdb1f072db
git bisect good 6d5f718a497375f853d90247f5f6963368e89803
git bisect good 7272dcd31d56580dee7693c21e369fd167e137fe
git bisect good 77de2c590ec72828156d85fa13a96db87301cc68
git bisect good 82cfbb008572b1a953091ef78f767aa3ca213092
git bisect good b75f53dba8a4a61fda1ff7e0fb0fe3b0d80e0c64
git bisect good c087567d3ffb2c7c61e091982e6ca45478394f1a
git bisect good d4b37ff73540ab90bee57b882a10b21e2f97939f
git bisect good fde1b3fa947c2512e3715962ebb1d3a6a9b9bb7d

and then you'll apparently hit that commit you had compile problems
with. HOWEVER, at that point, just do

git bisect visualize

and pick a commit somewhere roughly half-way that you suspect is a good
point of testing, but not near the range that you had problems with. If
you have compile problems in the middle, pick something that is just one
third down, for example. It will make the bisection slower, but
considering how unable we've been to make much progress other ways, if we
can narrow it down from 1874 commits to something smaller, I suspect we'll
be much happier.

Then you just do

git checkout <sha-you-picked-out-here>

and compile that one, and check.

Besides, while the _optimal_ point is half-way, even if you only remove a
third or a quarter of the commits at each stage, it's still going to be
an exponential thing.

Linus
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