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Diffstat (limited to 'results/classifier/mode-deepseek-r1:32b/reasoning/user/1877794')
| -rw-r--r-- | results/classifier/mode-deepseek-r1:32b/reasoning/user/1877794 | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/results/classifier/mode-deepseek-r1:32b/reasoning/user/1877794 b/results/classifier/mode-deepseek-r1:32b/reasoning/user/1877794 new file mode 100644 index 00000000..1cc3a1cc --- /dev/null +++ b/results/classifier/mode-deepseek-r1:32b/reasoning/user/1877794 @@ -0,0 +1,15 @@ +<think> +Okay, so I need to figure out whether this bug report is related to user-mode or system-mode in QEMU. Let's start by understanding the problem described. + +The user mentioned that they're working on their own branch of QEMU implementing drm IOCTLs and encountered a crash with SIGILL when running glxgears via GLXSwapBuffers(). They traced it down to a bad shift instruction generated during translation, specifically an invalid RLDICL instruction which is causing the issue. They tried disabling constant folding for arithmetic instructions, which fixed the problem but then re-enabled it step by step and found that subtraction optimizations were causing the bug again. + +Now, thinking about QEMU's architecture: user-mode emulation (like when running a process) handles translation of guest instructions to host instructions, whereas system-mode deals with emulating an entire system, including peripherals and devices. SIGILL typically relates to invalid instructions generated during code translation, which happens in user-mode emulation because it's translating guest application instructions. + +The issue arises from how QEMU optimizes and translates the guest code, specifically in the subtraction operation leading to a bad shift instruction. This sounds like a problem within the CPU emulator (TCG) part of QEMU when handling arithmetic optimizations for user applications. Since drm IOCTLs are system calls made by user-space applications, this points towards user-mode issues rather than system-level device emulation. + +Therefore, the bug is likely related to how QEMU's user-mode translation handles certain arithmetic operations and optimizations, leading to invalid instructions being generated. This would fall under the 'user' category. +</think> + +The issue involves instruction translation and optimization during user-space application execution, which falls under user-mode emulation in QEMU. + +**Answer:** user \ No newline at end of file |