blob: 391d31a630329c8518a48ce47dc4d039f6ee7e1a (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
|
<think>
Okay, I'm trying to figure out whether this bug report is about user-mode or system-mode in QEMU. Let me start by understanding the problem described.
The issue occurs when running a threadcount test using qemu-sh4, which suggests it's targeting the SH4 architecture in user mode since that's what the 'linux-user' part implies. The steps involve building QEMU with specific configurations and then running tests that sometimes result in deadlocks.
Looking at the backtrace provided from GDB, it mentions threads related to futex operations. Futexes are used for synchronization in multi-threaded applications. The stack traces show functions like safe_futex, do_safe_futex, which are part of QEMU's user-mode emulation handling system calls. The main thread (CPU loop) and other threads handling events seem to be stuck.
The fact that the deadlock happens when running a threadcount test suggests it's related to how multiple threads interact within the emulated environment. Since this is using the SH4 target, which is handled by QEMU's user-mode emulation, it points towards an issue in the user-mode setup rather than system-mode where higher-level devices and OS interactions would be involved.
Additionally, the error occurs during a test that specifically targets thread handling, which is more about the emulator's ability to manage multiple threads correctly. This is typically handled at the user-mode level as it involves scheduling and context switching of emulated processes.
I don't see any mention of hardware devices or system-level operations in the backtrace, which are more common in system-mode issues. Everything points towards internal thread management within QEMU's user-mode environment causing the deadlock.
</think>
user
|