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Re: need help on bus error problem

Subject: Re: need help on bus error problem
From: Jun Sun <>
Date: Mon, 27 Oct 2003 09:49:54 -0800
In-reply-to: <>; from TERESAT@TTI-DM.COM on Sat, Oct 25, 2003 at 09:44:35AM -0700
Original-recipient: rfc822;
References: <>
User-agent: Mutt/1.2.5i
On Sat, Oct 25, 2003 at 09:44:35AM -0700, Teresa Tao wrote:
> Hi there,
> I am working on an real time video playback applicaion on a mips cpu. But 
> after my video application play a while like 5 to 10 minutes, a bus error 
> happened.
> We add some debug meesage in the kernel, so we know that after the do_ade 
> function inside the unalign.c, the bus error happens for the opcode lw or sw. 
> So my guess is that I have an unaligned memory pointer(not in 4 byte 
> boundary).
> But my puzzle is that if I have an unaligned memory pointer, it should happen 
> at the first loop I playback, how come it happens after it plays several 
> loops?

There are many reasons for having bus error, cache, errant pointers,
unstable hardware, or some tricky kernel bugs which happens when
certain conditions happen together.

> Is there a possibility that my application's stack being trashed after a 
> while? but I don't have recursive calls inside my application.

Everything is possible.  :)


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