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Re: /usr/bin/m4: internal error detected



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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 .''`.  John Paul Adrian Glaubitz
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`. `'   Freie Universitaet Berlin - glaubitz@physik.fu-berlin.de
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