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Diffstat (limited to 'results/classifier/no-thinking-deepseek-r1:70b/reasoning/syscall/1910605')
| -rw-r--r-- | results/classifier/no-thinking-deepseek-r1:70b/reasoning/syscall/1910605 | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/results/classifier/no-thinking-deepseek-r1:70b/reasoning/syscall/1910605 b/results/classifier/no-thinking-deepseek-r1:70b/reasoning/syscall/1910605 new file mode 100644 index 00000000..2be36e77 --- /dev/null +++ b/results/classifier/no-thinking-deepseek-r1:70b/reasoning/syscall/1910605 @@ -0,0 +1,31 @@ +The issue arises when using `qemu-arm-static` but not with `qemu-aarch64-static`, indicating that the problem is specific to how system calls are handled on 32-bit ARM versus 64-bit ARM environments. The error `EFAULT (Bad address)` suggests an invalid pointer is being passed to the `ioctl` system call. + +Looking at the code snippet: + +```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 problem likely lies in how the `usbdevfs_bulktransfer` structure is being handled. The structure size or data alignment might differ between 32-bit and 64-bit environments, causing the address to be invalid in one case but valid in the other. + +This points to an issue with the system call handling, specifically how the `ioctl` syscall processes the structure pointer on different architectures. + +**Step-by-Step Explanation:** + +1. **System Call Behavior:** The `ioctl` system call is being used with the `USBDEVFS_BULK` command. This command expects a pointer to a `usbdevfs_bulktransfer` structure. + +2. **Structure Size Mismatch:** On 32-bit ARM (`qemu-arm-static`), the size of the `usbdevfs_bulktransfer` structure might be different compared to 64-bit ARM (`qemu-aarch64-static`). This mismatch can cause the kernel to interpret the pointer incorrectly, leading to an `EFAULT`. + +3. **Data Alignment:** The alignment of data within the structure might also differ between architectures, causing the address passed to `ioctl` to point to an invalid memory location. + +4. **Architectural Differences:** QEMU emulates different architectures, and if the structure or its members are not properly handled in the 32-bit ARM emulation, it can result in incorrect memory addressing. + +Given that the error is related to system call handling and structure alignment across different architectures, this falls under the **syscall** category. The issue is not with a faulty instruction but rather with how the system call interacts with user-space data structures on different architectures. + +**Answer:** +syscall \ No newline at end of file |