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Diffstat (limited to 'results/classifier/deepseek-r1:32b/reasoning/instruction/1806243')
| -rw-r--r-- | results/classifier/deepseek-r1:32b/reasoning/instruction/1806243 | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/results/classifier/deepseek-r1:32b/reasoning/instruction/1806243 b/results/classifier/deepseek-r1:32b/reasoning/instruction/1806243 new file mode 100644 index 00000000..9d61fd1a --- /dev/null +++ b/results/classifier/deepseek-r1:32b/reasoning/instruction/1806243 @@ -0,0 +1,32 @@ +<think> +Okay, so I'm trying to figure out this QEMU issue that someone reported. Let's break it down step by step. + +First, the problem is happening when debugging ARM code using GDB and QEMU. The code in question uses Thumb2 instructions, specifically an if-then block. The user says that during normal execution, everything works fine, but when they're debugging, the program hangs at a particular conditional branch instruction. + +Looking at the provided disassembly: + +2000407a: push {lr} +... +2000408e: itt lt +20004090: pushlt {r0, r1} +20004092: blt.w 0x20004082 ; unpredictable <IT:lt> // <-- GDB hangs here +20004096: pop {pc} + +The issue is at the blt.w instruction. The user mentions that when r0 equals r1, the program counter doesn't get updated, so execution stops there. + +They tried to reproduce this with inline assembly in a test function. Interestingly, in their test case, they replaced the original branch address (which was pointing back into RAM) with a label "1b", which is within the same function. This worked when running normally but not during debugging. + +The key difference seems to be where the code runs: the problematic code is in RAM, while the inline assembly version runs from flash memory. The user also referenced an existing bug report on Launchpad (bug #1364501) which has similar symptoms. + +They're using QEMU 3.0.0 and arm-none-eabi-gdb 8.2. + +Now, to classify this bug under the categories given: instruction, syscall, or runtime. + +The issue is related to how QEMU handles a specific instruction during debugging—specifically, a conditional branch after an ITT (if-then) instruction. The problem occurs when the condition isn't met, and execution should continue past the branch. It seems like QEMU might not be correctly handling the program counter or the IT state in certain cases, especially when running from RAM versus flash. + +Since it's about how an instruction is handled during debugging, leading to a hang, this falls under an 'instruction' category. The bug report describes a faulty behavior of an instruction in QEMU. +</think> + +The problem arises because QEMU incorrectly handles the conditional branch instruction (blt.w) after an ITT when running from RAM during debugging. This issue is specifically related to how the instruction behaves in certain conditions, so it's categorized under 'instruction'. + +**Answer:** instruction \ No newline at end of file |