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Diffstat (limited to 'results/classifier/mode-deepseek-r1:32b/reasoning/user/1885332')
| -rw-r--r-- | results/classifier/mode-deepseek-r1:32b/reasoning/user/1885332 | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/results/classifier/mode-deepseek-r1:32b/reasoning/user/1885332 b/results/classifier/mode-deepseek-r1:32b/reasoning/user/1885332 new file mode 100644 index 000000000..3e698a4ab --- /dev/null +++ b/results/classifier/mode-deepseek-r1:32b/reasoning/user/1885332 @@ -0,0 +1,22 @@ +<think> +Okay, I need to figure out whether this bug is user-mode related or system-mode related. Let me start by understanding the problem. + +The issue is about an ELF binary crashing in user-mode emulation but running fine in system-mode (QEMU full-system). The crash happens during thread-local storage initialization because the AT_PHDR value from the aux vector is incorrect in user-mode. + +Looking at the provided information: + +- In the kernel's view, AT_PHDR is 0x900000. +- In QEMU's user-mode, it's 0xae000. This discrepancy causes the crash. + +The user mentions that they built a custom kernel to debug and see the aux vector. The problem arises when using qemu-arm in user-mode with GDB, which shows a different AT_PHDR value than what the kernel provides. + +I know that QEMU has two modes: system-mode (emulating an entire OS) and user-mode (just running binaries without full OS). In system-mode, the kernel is involved, so the aux vector is set by the kernel. In user-mode, QEMU acts as a standalone emulator and sets up the aux vector itself. + +The fact that AT_PHDR differs between kernel and user-mode suggests an issue in how QEMU's user-mode calculates or retrieves the program headers. This is likely a bug within QEMU's user-mode emulation of the ELF loading process, possibly not correctly mapping the segments as the kernel does. + +Since the problem occurs only in user-mode and involves aux vector setup during binary execution without full OS context, it points to a user-mode issue. +</think> + +The problem arises from QEMU's user-mode incorrectly setting the AT_PHDR value, causing a mismatch compared to the kernel. This is specific to how user-mode emulates the ELF loading process. + +user \ No newline at end of file |