https://bugs.kde.org/show_bug.cgi?id=384732

--- Comment #4 from Mark Wielaard <m...@klomp.org> ---
I wonder if we can also rely on the CLONE_VFORK mechanism.

So if we see a clone with CLONE_VFORK | CLONE_VM we don't drop the CLONE_VM,
but do freeze all other threads till we see the exec/exit syscall.

Since till the exit/exec the host and child memory are the same and only that
child thread is running it should keep the valgrind datastructures sane.

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