I've encountered a problem with Debian Squeeze. Wheezy doesn't seem to have a 
bigmem kernel, so I can't test it there.

I have a custom firewall based on Smoothwall. I've been testing it (kernel 
2.6.35 with PAE and SMP) on Squeeze in KVM without trouble for a couple years.

When I upgraded my firewall's kernel to 3.0, it would no longer boot in KVM. 
Instead, it hangs right after displaying the first three lines on the console, 
and the host CPU goes to 100%. Trying other kernels, I found that none of 3.0, 
3.2 or 3.4 will boot.

Investigating further, I found that those kernels *will* boot if I use 
Debian's x86 or x86_64 kernel. But they *won't* boot when using Squeeze's 
bigmem (PAE) kernel.

I tried both Squeeze's kvm as well as a build of qemu-kvm 1.1.x.

In a sentence, my 3.x kernels with PAE and SMP will not boot in KVM on Squeeze 
when using a bigmem (PAE) kernel, but they *do* boot when using Squeeze's 686 
or x86_64 kernel, as well as Wheezy's x86_64 kernel.

Can anyone verify this, or is it just me? Is it possible I missed a kernel 
config parameter required to allow the PAE-enabled kernel to boot in a KVM 
session? Could it be a Debian build problem? An upstream kernel problem? Or a 
qemu-kvm problem?

Here's an example ISO (29MiB, linux 3.4.9):
  http://roadster.agcl.us/release/agcl-0.0.0-offroad.iso
Select the 'Explore' option from the boot menu.

Thanks!


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