Error "cannot bind memory to host NUMA nodes: Operation not permitted" running inside docker

[Manuel Hohmann]

Hi,

I encountered the following error message on the QEMU 5.0.0 release, compiled 
and run inside a docker image:

"cannot bind memory to host NUMA nodes: Operation not permitted"

The QEMU command line to reproduce this behavior (it happens also on -x86_64, 
-arm, -aarch64 with similar command line):

qemu-system-i386 -m 64 -M pc -smp 1 -display none -monitor stdio -drive 
file=mp-acpi/NOS.iso,media=cdrom,id=d -boot order=d -d cpu_reset

The docker image which shows the error is available here:

https://hub.docker.com/repository/docker/xenos1984/test-qemu

Built on Ubuntu 20.04, and including NUMA support with libnuma-dev package 
installed, from the following sources:

https://github.com/xenos1984/cross-toolchain/tree/master/tools-qemu
https://github.com/xenos1984/cross-toolchain/tree/master/test-qemu

The iso image used can be obtained here, but should not be relevant:

https://github.com/xenos1984/NOS/releases/download/latest/nos-i686.iso.bz2

The command fails when the image is used in a CI environment:

https://circleci.com/gh/xenos1984/NOS/953

On recommendation by @imammedo I post the issue to qemu-devel, and also tried 
the following patch:

--- a/backends/hostmem.c
+++ b/backends/hostmem.c
@@ -384,3 +384,3 @@
          if (mbind(ptr, sz, backend->policy,
-                  maxnode ? backend->host_nodes : NULL, maxnode + 1, flags)) {
+                  maxnode ? backend->host_nodes : NULL, 0, flags)) {
              if (backend->policy != MPOL_DEFAULT || errno != ENOSYS) {

But no success, the same error occurs. It happens only within docker - the same 
command runs fine on my desktop (also Ubuntu 20.04) system.

Best regards,
xenos1984 / Manuel Hohmann

PS: I apologize if this mail is sent / received more than once; there was a 
problem with my outgoing mails.

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