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Re: [Qemu-devel] /usr/bin/m4: internal error detected
From: |
John Paul Adrian Glaubitz |
Subject: |
Re: [Qemu-devel] /usr/bin/m4: internal error detected |
Date: |
Fri, 1 Dec 2017 13:22:20 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.4.0 |
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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