Re: [Qemu-devel] 64-on-32 TCG broken

[Stefan Weil <sw@weilnetz.de>]

Am 30.10.2012 09:15, schrieb Paolo Bonzini:
> Il 29/10/2012 19:29, Aurelien Jarno ha scritto:
>> On Mon, Oct 29, 2012 at 06:53:14PM +0100, Paolo Bonzini wrote:
>>>> Known-good commit: 8473f377393219390ea6f2d8d450a2b054bb823e
>>>> Known-bad commit: d262cb02861dd33375c08fc798930653b14769e9
>>>>
>>>> i386-softmmu seems to work.  I may try to bisect it tomorrow, but I'd be
>>>> glad if somebody else beats me.  It can be reproduced with Wine and
>>>> "x86_64-softmmu/qemu-system-x86_64.exe -L ../pc-bios"; it hangs at iPXE.
>> Oops, sorry about that. Is it win32 or win64? I'll try to fix it asap,
>> but right now I don't have a good network connection enough to either
>> setup a mingw build environment or to connect to a remote machine with
>> such an environment.
>
> It's win32, and the first bad commit is 9c43b68 (tcg: rework liveness
> analysis, 2012-10-09).  But it looks like 64-on-32 emulation is more
> generally broken.  I now tried x86_64-linux-user compiled for 32-bit,
> and it segfaults on startup.  Even the previous commit cannot run
> qemu-x86_64 /bin/ls correctly:
>

I just tested with latest qemu-system-x86_64 on 32 bit Linux.

It also hangs during boot (BIOS), so it looks like this
is not a MinGW only problem.

Your test with x86_64-linux-user indicates that, too.

I also get the problem with TCI. Therefore I expect that any
32 bit TCG target will show it.

Regards
Stefan W.



> $ git whatis HEAD
> ec7a869 (tcg: sync output arguments on liveness request, 2012-10-09)
> $ x86_64-linux-user/qemu-x86_64 /bin/ls
> inux-user
>
> $ git whatis HEAD
> 9c43b68 (tcg: rework liveness analysis, 2012-10-09)
> $ x86_64-linux-user/qemu-x86_64 /bin/ls
> qemu: uncaught target signal 11 (Segmentation fault) - core dumped
> Errore di segmentazione
>
>
> Regarding the win32 failure, it's early enough that the TCG logs give
> an idea of what is happening.  This *might* be a reduced testcase,
> but the general breakage makes it impossible to check: