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Diffstat (limited to 'results/classifier/deepseek-2-tmp/reasoning/mistranslation/1910605')
| -rw-r--r-- | results/classifier/deepseek-2-tmp/reasoning/mistranslation/1910605 | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/results/classifier/deepseek-2-tmp/reasoning/mistranslation/1910605 b/results/classifier/deepseek-2-tmp/reasoning/mistranslation/1910605 new file mode 100644 index 000000000..31d2d80b2 --- /dev/null +++ b/results/classifier/deepseek-2-tmp/reasoning/mistranslation/1910605 @@ -0,0 +1,32 @@ +<think> +Alright, let's try to figure out the category for this bug report. The user mentioned that they're encountering an EFAULT error when using `qemu-arm-static`, specifically with the ioctl call `USBDEVFS_BULK`. The same code works fine with `qemu-aarch64-static` on their 64-bit Intel laptop. + +First, I need to understand what's happening here. The error message says "Bad address," which usually indicates that there's an issue with a pointer being passed to a system call. In this case, the ioctl function is returning -1 and setting `errno` to EFAULT, meaning the kernel couldn't access the data because of an invalid pointer. + +Looking at the code snippet provided: + +```c +struct usbdevfs_bulktransfer Bulk; +Bulk.ep = hUsb->UsbOut; +Bulk.len = Len; +Bulk.data = (void *)pData; +Bulk.timeout = Timeout; +Bytes = ioctl(hUsb->fd, USBDEVFS_BULK, &Bulk) +``` + +The `ioctl` function is being called with a pointer to the struct `Bulk`. The error occurs when running under `qemu-arm-static`, which suggests that there's an issue related to how data is handled between user-mode and the target architecture. + +Now, considering the possible categories: mistranslation refers to incorrect mapping from source to IR/target architectures. Since the problem only occurs with the ARM static QEMU but not with AArch64, it points towards a translation or handling issue specific to 32-bit vs. 64-bit environments. + +Another possibility is assembly lowering (assembly), which involves converting higher-level code into machine-specific assembly. However, the error here seems more related to pointer validity rather than assembly issues. + +Looking at other categories like device, graphic, socket, network: these don't seem directly relevant since it's an ioctl call related to USB devices, but the issue is with how data is passed across architectures. + +The problem arises when using QEMU's ARM static versus AArch64 static. The 64-bit version works fine, so it's likely a 32/64-bit mismatch causing pointer issues. In a 64-bit environment, pointers are 64 bits, but in a 32-bit environment (like when using `qemu-arm-static`), pointers are 32 bits. If the application is running on a 64-bit host but trying to use 32-bit pointers, it could lead to issues where addresses aren't properly handled, resulting in EFAULT. + +Therefore, the bug seems related to how QEMU translates or handles data structures between the source (x86-64) and target (ARM) architectures. This fits under "mistranslation" because it's about incorrect mapping from the host architecture to the target's user-mode environment. +</think> + +The issue is due to incorrect handling of pointers during translation between different architectures, specifically 32-bit and 64-bit environments. The `ioctl` function fails because the pointer passed isn't valid in the target ARM context running under QEMU. + +**mistranslation** \ No newline at end of file |