Re: [uml-devel] buggy UML AMD64?

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

>> 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.
> I have a 2.6.19, vanila kernel on top of redhat4, host.
There is one major difference in this case, redhat4 uses glibc 2.3 
whereas fc6 (and gentoo-current) use glibc 2.4
A lot of the problems that I am reporting started when glibc was 
upgraded (sorry I forgot to mention that)


> And any kernel between 2.6.17 - 2.6.20-rc5 x86_64 for guests.
> For my iSCSI tests they all run well.
> At the very beginning, I had bad crashes and I solved it with plain gdb.
> The point for us to use UML, from the begging, was to use gdb on our own kernel development.
> At the end it was very easy to find that I have miss-configured the uml kernel, when that was fixed every thing
> ran well.
> 
> for me I just do
> #gdb um/vmlinux (was compiled with -O um)
> gdb>run ubd0=/var/opt/FedoraCore5-AMD64-root_fs eth0=tuntap,,,192.168.0.117
> after first trap in gdb
> gdb>handle SIGUSR1 pass nostop noprint
> from than on its strait gdb, tell me if you need a script for loading symbols of kernel modules.
That would be great, it could go on the wiki too.

Thanks
Antoine

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