[User-mode-linux-devel] Re: User-mode linux stack overflow: could be generic problem

[Jeremy F. <je...@go...>]

On Sun, Oct 08, 2000 at 12:35:48AM -0500, Jeff Dike wrote:
> I've been waiting for someone to send me that stack.  There aren't any real 
> smoking guns there.  I'm guessing that the difference between your laptop and 
> the machine it works on is that your laptop is running a fairly recent kernel 
> (2.4.0-testx) and the other isn't.

Yep, that's right.

> The sigcontext struct greatly increased in 
> size (to ~800 bytes IIRC) to accomodate the MMX registers or something.  There 
> are three signals on your stack, so those frames by themselves are taking up 
> half the stack page.
> 
> Anyway, the patch below removes 256 bytes from the set_signals frame.  It 
> ought to alleviate things a bit.  I'll be looking for other things I can do, 
> as well. Let me know how it works for you.

I'm afraid this doesn't help.  The stack still overflows at the same point.
It looks like each signal frame is ~760 bytes.  Even with this patch, the
overflow is 808 bytes (without the patch it's 1232 bytes).

	J