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Diffstat (limited to 'results/classifier/deepseek-2/reasoning/mistranslation/1755479')
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diff --git a/results/classifier/deepseek-2/reasoning/mistranslation/1755479 b/results/classifier/deepseek-2/reasoning/mistranslation/1755479 new file mode 100644 index 000000000..54e85df93 --- /dev/null +++ b/results/classifier/deepseek-2/reasoning/mistranslation/1755479 @@ -0,0 +1,54 @@ +<think> +Okay, so I need to classify this bug report from QEMU into one of the given categories. Let me read through the problem description carefully. + +The user reports that a basic program runs fine when compiled with -O0 but triggers a QEMU abort when using -O1 and running with icount. The error message is "qemu: fatal: IO on conditional branch instruction." They noticed this issue in C code where swapping the order of operations, like changing "int foo = *bar; bar++;" to "int foo = *bar++;", causes the problem. + +Looking at the command line they used: +`qemu-system-arm -M lm3s6965evb -nographic -kernel hello.bin -serial file:$(tty) -icount 4 -cpu cortex-m4` +Without icount, it works fine. So the issue arises specifically when using the icount option. + +They also tested various QEMU versions and found that stock version 2.5.0 worked, while others didn't. The problem is happening with Cortex M architecture. + +Now, looking at the possible categories: +- mistranslation +- assembly: assembly lowering +- other +- device +- graphic +- socket +- network +- KVM +- boot +- vnc +- debug +- files +- permissions +- performance +- kernel +- peripherals +- hypervisor + +The error message mentions IO on a conditional branch. That suggests it's related to how the instruction is being handled, possibly during translation or execution. + +Since the problem occurs when using optimized code (-O1) and with icount enabled, it might be an issue in how QEMU handles certain optimizations or specific CPU behaviors under these conditions. The fact that the order of operations affects this could point towards a translation issue, perhaps in the assembly lowering phase when optimizations are applied. + +Alternatively, if the bug is due to incorrect handling of the instruction by the emulator's CPU model, it might fall under 'mistranslation'. But considering that the problem occurs with icount, which is part of the device emulation or debugging features, maybe it's related to the 'debug' category. However, 'debug' might not directly relate to this error. + +Another angle: The issue could be in how QEMU handles the Cortex-M4 CPU instructions when running under specific configurations. Since it's a Cortex M, which is an ARM architecture, perhaps the problem lies in the translation from user-mode assembly to the target IR or machine code, leading to incorrect handling of the conditional branch. + +Wait, but the error message is about IO on a conditional branch. That suggests that during execution, QEMU tried to perform I/O on a conditional branch instruction, which isn't allowed. So perhaps it's an issue in how QEMU translates or emulates this particular instruction when certain optimizations are applied. + +Since the problem happens with -O1 and icount, maybe it's related to how the code is being optimized during assembly lowering (as part of the translation process). Alternatively, if it's about incorrect mapping from source to target architecture, that would be 'mistranslation'. + +Alternatively, considering that this affects QEMU's emulation when running with specific flags, perhaps it's a device-related issue because icount might interact with some device emulation. + +But looking at the categories again, 'mistranslation' seems more fitting if it's about incorrect instruction handling during translation. If it were a problem in assembly lowering, maybe 'assembly: assembly lowering' would be appropriate. However, the specific error message points towards an issue during execution rather than during the lowering phase. + +Wait, but the user is compiling with -O1, which affects how the compiler optimizes the code, and then running under QEMU's icount. So perhaps it's about how QEMU handles optimized binaries, leading to incorrect translation of certain instructions that involve side effects (like bar++). + +Given that changing the order of operations in the C code causes a failure, it suggests that the assembly generated might be different when optimizations are applied, and QEMU isn't handling it correctly. This points towards an issue in the translation process—specifically, mistranslation or incorrect mapping during IR generation. + +So considering all this, I think 'mistranslation' is the most appropriate category because it's about the incorrect semantic mapping from source to target, likely happening during QEMU's instruction handling when optimized code is run. +</think> + +mistranslation \ No newline at end of file |