Re: [uml-devel] buggy UML AMD64?

[Antoine Martin <antoine@nagafix.co.uk>]

Antoine Martin wrote:
>>>> I have downgraded the x86 boxes to 2.6.15.7 and these are up and 
>>>> running again. But I can't do that for all of them, and this is just 
>>>> not an option for some of the amd64 boxes.
>>>
>>> My setup is:
>> Thanks for that. That is very similar to mine.
>> I don't think this has anything to do with the guest... So I'll try to 
>> remove the skas3 patch from the host and see how it goes.
>>
> I did, and no improvement... x86 guests still hang.
> Could you post a binary guest kernel somewhere so I can try that?
> (even if it isn't static - glibc should be similar since we're using 
> Gentoo amd64)
> If that still does not work then I can be certain that it is something 
> to do with the host.
I've just tried on 3 more hosts, all AMD64 Gentoo fully up to date, 
kernel 2.6.19.2. No skas, no exec shield, no selinux, plain kernel.org:
None of them work with any of the 32-bit kernels!
It prints nothing, just sits there spinning at 100% cpu.
So I am now totally convinced that i haven't got a weird setup.
Something else is broken in UML.

On fully up to date Fedora Core 6 x86_64, the kernel does display 
something before crashing:
# uname -a
Linux localhost.localdomain 2.6.18-1.2869.fc6 #1 SMP Wed Dec 20 14:51:34 
EST 2006 x86_64 x86_64 x86_64 GNU/Linux
# ./kernel32-2.6.19.2
Checking that ptrace can change system call numbers...OK
Checking syscall emulation patch for ptrace...missing
Checking for tmpfs mount on /dev/shm...OK
Checking PROT_EXEC mmap in /dev/shm/...OK
Checking for the skas3 patch in the host:
   - /proc/mm...not found
   - PTRACE_FAULTINFO...not found
   - PTRACE_LDT...not found
UML running in SKAS0 mode

[root@localhost home]#

This is 100% repeatable. Plain Fedora.
Many users will have a similar setup and will just give up on UML.
So I as I said before, UML is currently unusable for most people out 
there running fairly recent systems.

Antoine

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