linux-kernel - Re: [Bug 11046] New: Kernel bug in mm/bootmem.c on Sparc machines

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Message-Id: <20080723.202533.114601491.davem@davemloft.net>
Date:	Wed, 23 Jul 2008 20:25:33 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	akpm@...ux-foundation.org
Cc:	sparclinux@...r.kernel.org, bugme-daemon@...zilla.kernel.org,
	lomp0101@....net, linux-kernel@...r.kernel.org
Subject: Re: [Bug 11046] New: Kernel bug in mm/bootmem.c on Sparc machines

From: Andrew Morton <akpm@...ux-foundation.org>
Date: Sun, 6 Jul 2008 13:20:49 -0700

> On Sun,  6 Jul 2008 13:02:28 -0700 (PDT) bugme-daemon@...zilla.kernel.org wrote:
> 
> > http://bugzilla.kernel.org/show_bug.cgi?id=11046
 ...
> > Here is the BUG:
> > 
> > [    0.000000] PROMLIB: Sun IEEE Boot Prom 'OBP 4.11.5 2003/11/12 10:40'
> > [    0.000000] PROMLIB: Root node compatible: 
> > [    0.000000] Linux version 2.6.25.10 (root@...rc1) (gcc version 4.1.2
> > 20061115 (prerelease) (Debian 4.1.1-21)) #5 SMP Sun Jul 6 21:05:42 CEST 2008
> > [    0.000000] console [earlyprom0] enabled
> > [    0.000000] ARCH: SUN4U
> > [    0.000000] Ethernet address: 00:03:ba:7a:f3:d6
> > [    0.000000] Kernel: Using 2 locked TLB entries for main kernel image.
> > [    0.000000] Remapping the kernel... done.
> > [    0.000000] kernel BUG at mm/bootmem.c:125!

This can only happen if you attach a zero-sized initrd to the kernel.

I see platforms like x86 sometimes have explicit checks for a zero
size to guard reserve_bootmem() and similar calls, but if that's what
callers are all going to do doesn't it make better sense for
reserve_bootmem_core() to just return instead of BUG on a zero size
argument?
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