Re: [uml-devel] UML/64bit is miscompiled by gcc 4.0.3 on Ubuntu 6.06 LTS

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

>> ptrace(PTRACE_SETREGS, 31586, 0, 0x6096dac8) = 0
>> ptrace(PTRACE_SETFPREGS, 31586, 0, 0x6096dba0) = 0
>> ptrace(PTRACE_SYSCALL, 31586, 0, SIG_0) = 0
>>
>> I'll have to verify whether some code in the stubs is miscompiled. But not 
>> until... well, I dunno when I'll be back...
>>
>> Anybody else with the same problem?
> 
> 
> Isn't this is the same problem we discussed a few months back?  What 
> I've discovered since then is this is a regression introduced after 
> 2.6.16 on the _host_.  Any post-2.6.16 host kernel, either skas v8.2 or 
> v9.pre causes Ubuntu (and other distros, I believe) to hang after "VFS 
> mounting root".
> 
> http://marc.theaimsgroup.com/?l=user-mode-linux-devel&m=116008558424368&w=2
> http://marc.theaimsgroup.com/?l=user-mode-linux-devel&m=116711159414443&w=2
Indeed it is.

A fix would be more than welcome. (2.6.16 is a bit dated)
I believe a lot of users are hitting this bug now too (and it is a 
regression) as a lot of distros ship recent kernels.

Another regression in 2.6.16 (or later?) is the inability to run 32-bit 
guests on 64-bit hosts (the same binaries that used to work before - 
statically compiled). The boot stops very early during the "checking 
ptrace" step.

Antoine

-------------------------------------------------------------------------
Take Surveys. Earn Cash. Influence the Future of IT
Join SourceForge.net's Techsay panel and you'll get the chance to share your
opinions on IT & business topics through brief surveys - and earn cash
http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV
_______________________________________________
User-mode-linux-devel mailing list
User-mode-linux-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel