blob: 4faee6b48f6cd22811e9aacb7b73e94ac27be0a7 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
|
<think>
Okay, so I'm trying to figure out whether this QEMU bug report is related to user-mode or system-mode issues. Let's break it down.
The problem occurs when compiling QEMU using Clang v17 or newer on certain systems like Fedora 39 or 40. The error message indicates an undefined behavior runtime error involving a function pointer type mismatch. Specifically, the code calls qemu_mutex_lock through a pointer that's incorrectly typed as 'void (*)(void *)'.
Looking at the stack trace, it points to include/qemu/lockable.h:95 and mention that qemuMutexLock is defined in thread.h:122. The error seems to stem from how function pointers are being used in lockable.h. It appears that QEMU is using a function pointer with an incorrect signature, which Clang's undefined behavior sanitizer catches.
The user also mentions similar issues in other projects like systemd and Python, where the way they're handling function pointers leads to undefined behavior. This suggests that it's a general programming issue related to function pointer type mismatches.
Now, considering whether this is a user-mode or system-mode bug: QEMU can run in both modes. User-mode involves running unprivileged code, while system-mode deals with higher-privilege operations like device emulation and OS-level interactions.
In this case, the error is about incorrect use of function pointers within QEMU's locking mechanisms. Locking functions are typically used throughout QEMU regardless of mode but might be more critical in system-mode where concurrency and isolation are crucial. However, since the issue arises from a code compilation problem involving function pointers, it doesn't directly relate to device emulation or OS-level tasks.
The problem is more about how the code is written—specifically, using function pointers incorrectly which leads to undefined behavior. This could affect both modes, but the root cause is in the QEMU code structure rather than system-level interactions.
Therefore, I think this bug is related to user-mode because it's a programming issue within QEMU's own codebase rather than interacting with system hardware or privileged operations.
</think>
user
|