Alright, I need to classify this bug report as either user-mode or system-mode related. The issue is happening during a Docker build for cross-compiling Go code on macOS using qemu 2.8. The error message mentions qemu-arm and an assertion failure in translate-all.c at line 175 regarding tb_lock. First, I should understand the context. The user is building a Docker image based on arm32v6/golang:1.10-alpine. They're trying to cross-compile their Go application for ARM architecture. During the build process, when running `go build`, qemu is being used as an emulator because they're compiling for an ARM target on a non-ARM host (MacOS in this case). The error message indicates that there's an assertion failure within qemu-arm: "Assertion `!have_tb_lock' failed." This suggests that qemu encountered an internal inconsistency or deadlock situation. The specific file and line mentioned, translate-all.c:175, point to the translation block (tb) locking mechanism. Now, considering user-mode vs system-mode: - **User-mode** typically deals with applications running on top of an operating system without needing low-level hardware access. - **System-mode** involves lower-level operations, including device drivers, kernel modules, and interactions with hardware peripherals. In this case, the issue occurs within qemu's internals during the translation process. Qemu is a system emulator that provides both user-mode (for running applications) and system-mode (emulating full systems). The error here seems to be related to how qemu handles the emulation of ARM instructions, specifically in the code generation part. The assertion failure in translate-all.c suggests a problem with how qemu is generating or managing translation blocks. This could indicate a bug in qemu's code that's responsible for translating guest CPU instructions into host machine code. Since this is about the core emulation process and not about running an application within a user-space environment, it leans towards system-mode. Moreover, the error occurs during cross-compilation which involves compiling for a different architecture (ARM) on an x86 host. Qemu's role here is to emulate the ARM environment, which is a system-level task rather than something that runs in user space. Therefore, this bug report is related to system-mode because it involves low-level emulation and translation processes within qemu, not just running applications in a higher-level environment. system