[uml-devel] Re: Bug#260111: user-mode-linux: upgrade hangs at "NET4: Linux TCP/IP 1.0 for NET4.0 "

[Allen Chan <alydar@users.sourceforge.net>]

I had no luck trying to get a better backtrace.  However, since this 
problem only showed up between 2.4.26-1um and 2.4.26-2um, I 
systematically backed out the CVS changes until the problem went 
away.

It turns out that the following changes caused the problem to show up:

arch/um/drivers/chan_kern.c 1.39 Fri 07-16-2004 02:27 PM EDT jdike Exp 
+65 -0
  Moved some non-userspace code from chan_user.c to chan_kern.c.
arch/um/drivers/chan_user.c 1.33 Fri 07-16-2004 02:27 PM EDT jdike Exp 
+0 -64
  Moved some non-userspace code from chan_user.c to chan_kern.c.

I cannot explain why simply moving a few functions from one file to 
another will have any real effect on the resulting kernel, but my 
2.4.26-2um guest kernel is now running fine without these changes.


On Wednesday 28 July 2004 01:22 pm, Jeff Dike wrote:
> alydar@users.sourceforge.net said:
> > #2  0xa014f091 in cpu_idle () at process_kern.c:212
> > #3  0xa000f635 in rest_init () at init/main.c:364
> > #4  0xa00025e6 in start_kernel () at init/main.c:458
>
> This is the problem stack.  One of the init functions is tripping
> over a semaphore, and no one has been able to tell me which init
> function it is or which semaphore.  Although the down isn't showing
> in this stack, which is a bit confusing.
>
> 				Jeff
>


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