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Diffstat (limited to 'results/classifier/deepseek-r1:32b/reasoning/runtime/1756')
| -rw-r--r-- | results/classifier/deepseek-r1:32b/reasoning/runtime/1756 | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/results/classifier/deepseek-r1:32b/reasoning/runtime/1756 b/results/classifier/deepseek-r1:32b/reasoning/runtime/1756 new file mode 100644 index 000000000..2d5f48c19 --- /dev/null +++ b/results/classifier/deepseek-r1:32b/reasoning/runtime/1756 @@ -0,0 +1,19 @@ +<think> +Okay, I'm trying to figure out how to classify this bug report about QEMU. The issue seems to be related to the brk() system call on Linux causing a SIGSEGV error. Let me break it down step by step. + +First, the problem occurs when using qemu8-user on Linux. When brk(NULL) is called, it might return a value that doesn't point to an existing page. QEMU then tries to memset this area, which leads to a segmentation fault because that memory isn't actually there. + +The bug report mentions that the issue arises in the do_brk() function at line 867 of syscall.c. The problematic code is trying to memset from g2h_untagged(target_brk) to brk_page - target_brk. If target_brk points to a non-existent page, this causes a SIGSEGV. + +The user explains that Linux returns a random value for brk(NULL), which can be higher than the current heap but not necessarily valid. They also note that the way Linux computes the maximum brk value is based on the most recent execve(), which might not reflect the actual memory layout due to operations like mmap or munmap, especially in cases like UPX decompression. + +The suggested fix is for QEMU to avoid calling memset unless the first page of the range exists. Alternatively, they mention using prctl(PR_SET_MM_BRK) but note its limitations. + +Looking at the possible categories: instruction, syscall, runtime. The issue isn't about a faulty CPU instruction or an error in handling syscalls per se; it's more about how QEMU handles memory management during runtime, particularly after a system call. So this seems like a runtime error because it occurs while executing code and accessing memory that doesn't exist as expected. + +I think the category should be "runtime" since it's an error happening during program execution due to incorrect assumptions about the memory state returned by brk(). +</think> + +The bug report describes a runtime issue where QEMU assumes contiguous .bss after a brk() call, leading to accessing invalid memory. This causes a SIGSEGV. The problem occurs during execution when attempting to memset non-existent pages. + +runtime \ No newline at end of file |