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id = 2515
title = "qemu -daemonize crashes on macOS with \"NSPlaceholderDate initialize may have been in progress in another thread\""
state = "opened"
created_at = "2024-08-18T21:37:41.097Z"
closed_at = "n/a"
labels = ["hostos: macOS", "workflow::Confirmed"]
url = "https://gitlab.com/qemu-project/qemu/-/issues/2515"
host-os = "macOS"
host-arch = "arm64 (\"Apple Silicon\"), Apple M3 chip"
qemu-version = "9.0.2 (latest version, as installed with HomeBrew)"
guest-os = "Ubuntu (riscv64, s390x), Debian (ppc64)"
guest-arch = "riscv64, s390x, ppc64"
description = """Context: I build [an open source project](https://tsduck.io/) on several operating systems and architectures. For riscv64, s390x, ppc64, I build in emulated virtual machines. The three emulated OS work correctly when running qemu manually and the project is correctly built.
Now, I want to automate the process in a script: for each target architecture, boot the VM (start qemu as a background process), connect to the VM using ssh, build the software, collect the binaries, shut down the VM.
Starting the same qemu command as used interactively as a background process with `&` does not work and fails immediately, apparently because of the lack of stdin. So, I added option `-daemonize` (and removed `-nographic` because an error message says the two options are incompatible).
Using `-daemonize` instead of `-nographic`, all qemu command immediately fail with the following error:
```
objc[1141]: +[__NSPlaceholderDate initialize] may have been in progress in another thread when fork() was called.
objc[1141]: +[__NSPlaceholderDate 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.
```"""
reproduce = """```
$ qemu-system-riscv64 -machine virt -smp 8 -m 8192 -daemonize \\
-bios fw_jump.bin -kernel u-boot.bin \\
-device virtio-net-device,netdev=net \\
-netdev user,id=net,hostfwd=tcp::2233-:22 \\
-drive file=disk.qcow2,format=qcow2,if=virtio -device virtio-rng-pci
objc[1141]: +[__NSPlaceholderDate initialize] may have been in progress in another thread when fork() was called.
objc[1141]: +[__NSPlaceholderDate 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.
$ qemu-system-s390x -machine s390-ccw-virtio -cpu max,zpci=on -smp 8 -m 8192 -daemonize \\
-drive file=disk.qcow2,format=qcow2,if=none,id=drive-virtio-disk0,cache=none \\
-device virtio-blk-ccw,devno=fe.0.0002,drive=drive-virtio-disk0,bootindex=1 \\
-nic user,hostfwd=tcp::2288-:22
objc[1209]: +[__NSPlaceholderDate initialize] may have been in progress in another thread when fork() was called.
objc[1209]: +[__NSPlaceholderDate 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.
$ qemu-system-ppc64 -smp 8 -m 8192 -daemonize \\
-drive file=disk.qcow2,format=qcow2 -nic user,hostfwd=tcp::2299-:22
qemu-system-ppc64: warning: TCG doesn't support requested feature, cap-cfpc=workaround
qemu-system-ppc64: warning: TCG doesn't support requested feature, cap-sbbc=workaround
qemu-system-ppc64: warning: TCG doesn't support requested feature, cap-ibs=workaround
qemu-system-ppc64: warning: TCG doesn't support requested feature, cap-ccf-assist=on
objc[1166]: +[__NSPlaceholderDate initialize] may have been in progress in another thread when fork() was called.
objc[1166]: +[__NSPlaceholderDate 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.
```
All the above commands work correctly when using `-nographic` instead of `-daemonize`. The virtual disks are the same as in the interactive runs, with a fully configured Linux OS (Ubuntu or Debian)."""
additional = """From a [report from here](https://stackoverflow.com/questions/63041445/python-os-high-sierra-nsplaceholderdate-error), I tried to define the environment variable `OBJC_DISABLE_INITIALIZE_FORK_SAFETY=YES` before running qemu. The `[__NSPlaceholderDate initialize]` errors disappear but qemu still crashes immediately."""
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