GNU bug report logs - #61011
‘guix system vm’ spawns QEMU and hangs

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From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludo@HIDDEN>
To: bug-guix@HIDDEN
Subject: =?utf-8?Q?=E2=80=98guix?= system =?utf-8?Q?vm=E2=80=99?= spawns
 QEMU and hangs
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Hello,

On my Guix System machine, the =E2=80=98qemu-system-x86_64=E2=80=99 spawned=
 by =E2=80=98guix
system vm=E2=80=99 hangs after printing =E2=80=9CBooting from ROM...=E2=80=
=9D; it has to be
terminated with SIGKILL, SIGINT is not enough.

Specifically:

  $(guix time-machine --commit=3D66188398c446bdf9ce044fa539536e9b54c28c60 \
    -- system vm gnu/system/examples/bare-bones.tmpl) -m 1024  # Good.

=E2=80=A6 whereas:

  $(guix time-machine --commit=3D9923100a42ffa80f604c1c13a5e999e6a4c15146 \
    -- system vm gnu/system/examples/bare-bones.tmpl) -m 1024  # Bad!

I thought the culprit might be this commit:

  commit 9923100a42ffa80f604c1c13a5e999e6a4c15146
  Date:   Fri Dec 23 09:42:27 2022 +0200

      gnu: sgabios: Fix build on cross-build architectures.

      * gnu/packages/firmware.scm (sgabios)[arguments]: When cross-building
      add a make-flag to use the correct objcopy.

=E2=80=A6 but even after reverting it on today=E2=80=99s master, QEMU occas=
ionally hangs
as before, though not always.

=E2=80=98qemu-minimal=E2=80=99 as used for =E2=80=9Cmake check-system=E2=80=
=9D seems to work fine.

There have been a number of packages unbundled, so I wonder if another
one of these might be causing problems.

What do you think?

Ludo=E2=80=99.