Gilles Chanteperdrix wrote:
> Philippe Gerum wrote:
>> - The very same kernel image does not break when booted via tftp here.
>> It really seems to need a boot of the kernel image from the hard drive
>> to get the issue. However, having the rootfs over NFS or on the hdd does
>> not seem to make any difference. This could be the sign of a mishandled
>> early access fault, which would be confirmed by your trace showing that
>> the double fault handler is called.
>
> Probably the sign that how the NIC is configured causes the interrupt or
> not when re-enabling hardware interrupt: when network booting, the
> bootloader or BIOS PXE loader leaves the NIC correctly disabled so that
> no interupt can be generated.
The point being that to cause the bug reliably on KVM, you can try and
put early in the kernel boot some hardware initialization code which
causes a NIC interrupt or any other interrupt to be generated.
--
Gilles.
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