[Bug 1859920] [NEW] daemoniz not working on MacOS

[JS]

Public bug reported:

OS: MacOS Catalina 10.15.2
Qemu install via brew: brew install qemu

qemu-system-x86_64 -version
QEMU emulator version 4.2.50 (v4.2.0-13-g084a398bf8-dirty)
Copyright (c) 2003-2019 Fabrice Bellard and the QEMU Project developers

---

Start Ubuntu Desktop 18.04 client as follow:

IMG_CD=$HOME/Downloads/iso/ubuntu-18.04.3-desktop-amd64.iso
IMG_FILE=$HOME/code/vm/qemu/u64d01.qcow2
MAC_ADDR=xx:xx:xx:xx:xx:xx

qemu-system-x86_64 \
-no-user-config -nodefaults \
-show-cursor \
-name u64d01 \
-M q35,accel=hvf,usb=off,vmport=off \
-cpu host -smp 4 -m 2048 \
-overcommit mem-lock=off \
-overcommit cpu-pm=off \
-rtc base=utc,clock=host \
\
-device virtio-tablet-pci \
-device virtio-vga \
\
-device virtio-blk-pci,drive=ssd1 \
-drive id=ssd1,file=$IMG_FILE,if=none,format=qcow2 \
\
-device virtio-net-pci,netdev=nic1,mac=$MAC_ADDR \
-netdev user,id=nic1,ipv4=on,ipv6=on,hostname=u64d01,hostfwd=tcp::2222-:22 \
\
-device ich9-intel-hda,id=snd,msi=on \
-device hda-output,id=snd-codec0,bus=snd.0,cad=0,audiodev=snd0 \
-audiodev coreaudio,id=snd0,out.buffer-count=10000 \
\
-daemonize

Give following error:

objc[3432]: +[NSNumber initialize] may have been in progress in another thread 
when fork() was called.
objc[3432]: +[NSNumber initialize] may have been in progress in another thread 
when fork() was called. We cannot safely call it or ignore it in the fork() 
child process. Crashing instead. Set a breakpoint on 
objc_initializeAfterForkError to debug.


I checked "ps -ef|grep qemu" before and after the command, there was no qemu 
process running.

** Affects: qemu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1859920

Title:
  daemoniz not working on MacOS

Status in QEMU:
  New

Bug description:
  OS: MacOS Catalina 10.15.2
  Qemu install via brew: brew install qemu

  qemu-system-x86_64 -version
  QEMU emulator version 4.2.50 (v4.2.0-13-g084a398bf8-dirty)
  Copyright (c) 2003-2019 Fabrice Bellard and the QEMU Project developers

  ---

  Start Ubuntu Desktop 18.04 client as follow:

  IMG_CD=$HOME/Downloads/iso/ubuntu-18.04.3-desktop-amd64.iso
  IMG_FILE=$HOME/code/vm/qemu/u64d01.qcow2
  MAC_ADDR=xx:xx:xx:xx:xx:xx

  qemu-system-x86_64 \
  -no-user-config -nodefaults \
  -show-cursor \
  -name u64d01 \
  -M q35,accel=hvf,usb=off,vmport=off \
  -cpu host -smp 4 -m 2048 \
  -overcommit mem-lock=off \
  -overcommit cpu-pm=off \
  -rtc base=utc,clock=host \
  \
  -device virtio-tablet-pci \
  -device virtio-vga \
  \
  -device virtio-blk-pci,drive=ssd1 \
  -drive id=ssd1,file=$IMG_FILE,if=none,format=qcow2 \
  \
  -device virtio-net-pci,netdev=nic1,mac=$MAC_ADDR \
  -netdev user,id=nic1,ipv4=on,ipv6=on,hostname=u64d01,hostfwd=tcp::2222-:22 \
  \
  -device ich9-intel-hda,id=snd,msi=on \
  -device hda-output,id=snd-codec0,bus=snd.0,cad=0,audiodev=snd0 \
  -audiodev coreaudio,id=snd0,out.buffer-count=10000 \
  \
  -daemonize

  Give following error:

  objc[3432]: +[NSNumber initialize] may have been in progress in another 
thread when fork() was called.
  objc[3432]: +[NSNumber initialize] may have been in progress in another 
thread when fork() was called. We cannot safely call it or ignore it in the 
fork() child process. Crashing instead. Set a breakpoint on 
objc_initializeAfterForkError to debug.

  
  I checked "ps -ef|grep qemu" before and after the command, there was no qemu 
process running.

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