[uml-devel] Strange behaviour in eth assignments

[Peter Hovorka <peter@fusselt.net>]

Hi,

Jeff told me to drop a note here about the following occurence:

Having compiled a 2.6.16.27 guest kernel with a bb1 patchset, I was 
unable to bring up an eth0 via tun/tap. The kernel runs well, but a 
command line of

./um2.6.16.27-bb1 ubd0=root_fs ubd1=swap_fs eth0=tuntap,tap112 mem=100M

starts the instance well, but a command inside the instance of 'ifconfig 
-a' results in an 'eth2' device being ready to be brought up. I haven't 
found a way to bring up an 'eth0' or an 'eth1' device inside the 
instance.

Has anyone had this kind of problem before? I've got no clue about its 
cause, this is what I found out until now:

- The problem seems to be independent from the Host Kernel. Using the 
above Guest Kernel, the system will always prepare eth2.

- The problem seems to be independent from most of the other options in 
the Kernel config as there are statically linked, network options etc.

- The problem is not (!) present with older Kernels. I did run some 
tests with other Kernels, the following ones failed to bring up eth0:

2.6.16.27 with bb1
2.6.16.9 with bs2

The following versions were ok in bringing up eth0 as usual:

2.6.14.3 with bs3
2.6.13.4 with bs5

- I haven't tried non-SKAS3 usage yet

As Jeff told me yesterday that there was possibly no change in that 
region of the UML code, I suspect that any kind of change in the recent 
Kernel sources has caused this artefact to show, sadly I haven't got 
the faintest idea of Kernel development myself, so I'm writing this to 
the devel list.

Kind regards,
Peter












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