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Problem was tracked down to a PMD kernel bug solved by the following commit:

commit 4c3250d6daee2ff56ee6c23a0c45fed29c2fa86c
Author: Devin Kim <dojip.kim@lge.com>
Date:   Thu Jul 5 20:30:53 2012 -0700

    ARM: 7438/1: fill possible PMD empty section gaps

    cherry-picking from kernel v3.5

    On ARM with the 2-level page table format, a PMD entry is represented by
    two consecutive section entries covering 2MB of virtual space.

    However, static mappings always were allowed to use separate 1MB section
    entries.  This means in practice that a static mapping may create half
    populated PMDs via create_mapping().

    Since commit 0536bdf33f (ARM: move iotable mappings within the vmalloc
    region) those static mappings are located in the vmalloc area. We must
    ensure no such half populated PMDs are accessible once vmalloc() or
    ioremap() start looking at the vmalloc area for nearby free virtual
    address ranges, or various things leading to a kernel crash will happen.

    Change-Id: I4936a18717d9fce5921f0399ef60cfdcd0ba6100
Signed-off-by: Nicolas Pitre <nico@linaro.org>
Reported-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Tested-by: "R, Sricharan" <r.sricharan@ti.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
    Cc: stable@vger.kernel.org
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

This reverts commit 5aff7394.