[Bug 43359] LVM volumes not detected

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https://bugzilla.kernel.org/show_bug.cgi?id=43359





--- Comment #1 from François Valenduc <francois.valenduc@xxxxxxxxxxxxx>  2012-06-10 06:12:06 ---
This problem seems impossible to bisect. The first run (794c10fa0fa4d) was the
result of the bisection limited to drivers and fs directories. A second run
where I also added the block directory lead to a commit related to watchdog,
which is impossible since I don't use watchdog on my computer.
A 3rd run on the whole kernel tree leads to this commit:

>From 4523e1458566a0e8ecfaff90f380dd23acc44d27 Mon Sep 17 00:00:00 2001
From: Dave Hansen <dave@xxxxxxxxxxxxxxxxxx>
Date: Wed, 30 May 2012 07:51:07 -0700
Subject: [PATCH] mm: fix vma_resv_map() NULL pointer

hugetlb_reserve_pages() can be used for either normal file-backed
hugetlbfs mappings, or MAP_HUGETLB.  In the MAP_HUGETLB, semi-anonymous
mode, there is not a VMA around.  The new call to resv_map_put() assumed
that there was, and resulted in a NULL pointer dereference:

This is also strange because I don't use hugetlb. I can revert this commit but
it doesn't change anything. Does anybody have an idea on what I could do to
further investigate this problem.

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