id = 2978
title = "Qemu assertion issue"
state = "opened"
created_at = "2025-05-22T15:27:00.476Z"
closed_at = "n/a"
labels = ["workflow::Needs Info"]
url = "https://gitlab.com/qemu-project/qemu/-/issues/2978"
host-os = "Ubuntu 24.04 LTS"
host-arch = "x86_64"
qemu-version = "QEMU emulator version 8.2.2 (Debian 1:8.2.2+ds-0ubuntu1.6)"
guest-os = "Custom OS (OxizeOS)"
guest-arch = "x86"
description = """This issue is **not caused by my OS**, as it runs perfectly under VMware and other emulators.

However, when using QEMU, the emulator sometimes randomly **crashes or aborts** during boot or early execution. The crash is **inconsistent** — sometimes it runs, sometimes it fails immediately.

QEMU fails with an **assertion failure** in `qemu_mutex_lock_iothread_impl`"""
reproduce = """Unfortunately, I do not know exactly what causes this issue. It may be specific to my system or configuration.

1. 
2."""
additional = """Qemu stdout:

```
ERROR:system/cpus.c:504:qemu_mutex_lock_iothread_impl: assertion failed: (!qemu_mutex_iothread_locked()) Bail out! ERROR:system/cpus.c:504:qemu_mutex_lock_iothread_impl: assertion failed: (!qemu_mutex_iothread_locked()) ./run: line 3: 3544 Aborted (core dumped)
```

Command line:
```
 qemu-system-x86_64 -debugcon file:OxizeOS.log -drive file=output/OxizeOS.hdd,format=raw -serial stdio
```"""