Windows plugins MSYS2 regression

Windows plugins MSYS2 regression

[Pierrick Bouvier]

Hi everyone,

I noticed some time ago (between Feb 1 and Feb 3) that QEMU plugins 
segfault when calling any API symbol with MSYS2 in mingw64 environment, 
compiled with gcc.

I reported this to MSYS2 project [1], suspecting a faulty compiler or 
runtime update, once I could identify that it's not a regression on QEMU 
itself. Indeed, older releases now segfault as well.

Recently, QEMU enabled Windows clang builds as well, which are not 
impacted, so QEMU plugins are still available this way. The regression 
is *not* related to this change.

It does not impact upcoming QEMU release, as the problem is not located 
on QEMU side, but is worth mentioning in case someone would create a bug 
report for this.

[1] https://github.com/msys2/MINGW-packages/issues/23577

Regards,
Pierrick

Re: Windows plugins MSYS2 regression

[Pierrick Bouvier]

Hi,

the issue was identified, as a change in ld, and needed changes on mingw 
side (see GitHub issue for details).

Meanwhile, for anyone using MSYS2, it's possible to revert this change 
by downgrading binutils, and recompiling QEMU:

pacman -U 
https://repo.msys2.org/mingw/mingw64/mingw-w64-x86_64-binutils-2.43.1-1-any.pkg.tar.zst

Regards,
Pierrick

On 3/4/25 11:50, Pierrick Bouvier wrote:
> Hi everyone,
> 
> I noticed some time ago (between Feb 1 and Feb 3) that QEMU plugins
> segfault when calling any API symbol with MSYS2 in mingw64 environment,
> compiled with gcc.
> 
> I reported this to MSYS2 project [1], suspecting a faulty compiler or
> runtime update, once I could identify that it's not a regression on QEMU
> itself. Indeed, older releases now segfault as well.
> 
> Recently, QEMU enabled Windows clang builds as well, which are not
> impacted, so QEMU plugins are still available this way. The regression
> is *not* related to this change.
> 
> It does not impact upcoming QEMU release, as the problem is not located
> on QEMU side, but is worth mentioning in case someone would create a bug
> report for this.
> 
> [1] https://github.com/msys2/MINGW-packages/issues/23577
> 
> Regards,
> Pierrick