linux-kernel - Re: 2.6.27-rc5-mm1: 3 WARN_ON dumps during boot (acpi + vmap_pte

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Date:	Tue, 9 Sep 2008 13:04:47 +1000
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Krzysztof Helt <krzysztof.h1@...zta.fm>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Dave Airlie <airlied@...ux.ie>,
	Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: 2.6.27-rc5-mm1: 3 WARN_ON dumps during boot (acpi + vmap_pte_range)

On Tuesday 09 September 2008 03:52, Krzysztof Helt wrote:

> alloc_vmap_area within(e07f0000-fffb7000) size=801000
> returns=(e0880000-e1081000)
> alloc_vmap_area within(e07f0000-fffb7000) size=2000
> returns=(e07f0000-e07f2000)
> alloc_vmap_area within(e07f0000-fffb7000) size=2000
> returns=(e0822000-e0824000) 
> vunmap_page_range (e07f0000-e07f2000 size=2000)
> free_vmap_area (e07f0000-e07f2000 size=2000)

> alloc_vmap_area within(e07f0000-fffb7000) size=5000
> returns=(e07f0000-e07f5000)
> ------------[ cut here ]------------ 
> WARNING: at mm/vmalloc.c:40 check_pte_range+0x83/0x90()

Thanks for that, it clearly shows the virtual address allocator
is allowing an overlapping allocation after a vm_unmap_aliases()
call. Unfortunately, my "random" test case happened not to
trigger that... I should have paid more attention to edge cases
rather than just random testing.

Anyway, I hope this fix should solve the problem for you? (it
fixes it here)

View attachment "vmap-new-infrastructure-fix2.patch" of type "text/x-diff" (436 bytes)