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qemu seems to lack support for pid namespace.
# Version
qemu-4.0.0
# commands used to launch qemu-aarch64 in user mode.
printf '%s\n' ':qemu-aarch64:M::\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\xb7\x00:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/bin/qemu-aarch64:'"${QEMU_BINFMT_FLAGS}" >/proc/sys/fs/binfmt_misc/register
> sudo cp /usr/bin/qemu-aarch64 $RPI/usr/bin
> sudo chroot $RPI /bin/ksh -l
# host
Gentoo Linux amd64
# Guest
Gentoo Linux aarch64
# The problem that I have
"emerge" program fails due to the error, "qemu: qemu_thread_create: Invalid argument".
"emerge" is Gentoo's package manager that compiles and installs packages.
# How to reproduce the issue
Execute
unshare --pid -- echo hello world
or
python -c "import portage.process; portage.process.spawn(['echo', 'hello', 'world'], unshare_pid=True)"
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