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Re: crash in first printk of start_kernel

To: Ralf Baechle <>
Subject: Re: crash in first printk of start_kernel
From: Attila Kinali <>
Date: Wed, 14 Mar 2007 09:04:27 +0100
In-reply-to: <>
Organization: NERV
Original-recipient: rfc822;
References: <> <>
Hoi Ralf,

On Tue, 13 Mar 2007 01:02:52 +0000
Ralf Baechle <> wrote:

> On Fri, Mar 09, 2007 at 07:13:54PM +0100, Attila Kinali wrote:
> > I'm using a (an old snapshot from about last august,
> > when we started development of another board) that has slight
> > adjustments in various drivers to accomodate for our platform
> > specific stuff.
> You may want to update anyway.  between the linux- tag of the
> and the top of the linux-2.6.16-stable branch there are
> almost 58,000 lines of patch.  Even more if your compare the MIPS -stable
> branch to's  Iow a few metric buttloads.

That's already planned. But if first have to get past those
dead lines. After that i can look into makeing the whole
build system upgradeable and managable-

> > 0xffffffff80266134 <vsnprintf+76>:      beqz    v0,0x80266144 <vsnprintf+92>
> > 0xffffffff80266138 <vsnprintf+80>:      bltz    a0,0x802461c0 
> > <jffs2_remount_fs+144>
> A branch in the delay slot of another branch is forbidden by the MIPS
> architecture.  All processors I every tried this on missbehave in very
> unobvious ways when this is attempted.
> You may want to compare that against your vmlinux file.  If the vmlinux
> binary also contains this bug, try building the affected source file with
> -S to find if the bug is cause by compiler or assembler.

It turned out to be a ground bounce problem. Interestingly the
"bug" was 100% reproducable, while normale ground problems are
totaly random. Thus i thought it has to be something in the

> In single stepping mode your debugger probably executes branches by
> software emulation.  Chances are the emulation does something different
> for this illegal code sequence than actual hardware.

Oh.. nice to know. Thanks.
Thanks a lot for your answer and help,

                        Attila Kinali
Praised are the Fountains of Shelieth, the silver harp of the waters,
But blest in my name forever this stream that stanched my thirst!
                         -- Deed of Morred

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