Re: [Qemu-devel] /usr/bin/m4: internal error detected

[John Paul Adrian Glaubitz]

On 12/01/2017 01:18 PM, Andreas Schwab wrote:
> > This isn't a bug in m4 or anything architecture-specific, it's a regression
> > that was introduced by an upstream change in glibc [1] and mainly affects
> > qemu-user which we are using for m68k and sh4 [2].
>
> It's a bug in qemu-linux-user, which ignores CLONE_VFORK, turning vfork
> into fork.  This breaks the expected semantics of vfork (VM sharing and
> blocking the child until exec).

Yes, I wasn't really arguing that it's a bug in QEMU as Adhemerval had already
explained. The problem was just that apparently resolving the issue in
QEMU isn't trivial as Peter Maydell mentioned in [1].

That's why I was looking for a workaround. However, I have re-tested Florian's
patch and it works for me now, it didn't when I tested it for the first time.

So, we have a workaround for the time being until the bug is resolved in QEMU.

Adrian

> [1] https://bugs.launchpad.net/qemu/+bug/1673976

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