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authorChristian Krinitsin <mail@krinitsin.com>2025-07-06 16:43:19 +0000
committerChristian Krinitsin <mail@krinitsin.com>2025-07-06 16:43:19 +0000
commit238ec2b7cc1557d6f34c33cc482e4d0cd3e266dd (patch)
treecd8a1b75ba7b3543eb7fe6857f408e7be4d9fd0b /results/classifier/deepseek-r1:32b/reasoning/syscall/1462640
parent96049c939b1916d80532630d63c14e04d5244f1d (diff)
downloademulator-bug-study-238ec2b7cc1557d6f34c33cc482e4d0cd3e266dd.tar.gz
emulator-bug-study-238ec2b7cc1557d6f34c33cc482e4d0cd3e266dd.zip
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+<think>
+Okay, I need to classify this bug report as either an instruction, syscall, or runtime issue within QEMU. Let me go through it step by step.
+
+The user is running a 32-bit MIPS program on a 64-bit x86 host using QEMU. The problem occurs when the program calls `shmat()`, which fails. They provided a small test case where compiling the code as 32-bit (using `-m32`) causes `shmat()` to fail with a pointer of -1, while compiling as 64-bit works fine.
+
+From their explanation, QEMU uses `mmap` with the `MAP_PRIVATE` flag when reserving memory for a 32-bit guest. However, `shmat()` requires using `MAP_SHARED`. This mismatch causes the failure because `shmat()` can't modify the existing mapping from private to shared.
+
+The issue seems related to how QEMU handles memory mappings for different architectures and how system calls interact with those mappings. Specifically, it's about how the `mmap` flags are set and whether they allow subsequent `shmat()` calls to succeed.
+
+Looking at the possible categories:
+- **Instruction**: This refers to an incorrect instruction being executed. The problem here isn't due to a specific CPU instruction but rather system call handling.
+- **Syscall**: This involves errors with system calls. Since `shmat()` is a syscall that fails, and it's related to how QEMU manages the memory mappings, this seems relevant.
+- **Runtime**: General runtime issues not tied directly to instructions or syscalls.
+
+The core issue is that the `mmap` flags set by QEMU conflict with what `shmat()` expects. Therefore, the problem arises during system call handling within the guest environment provided by QEMU. This makes it a syscall-related bug because it's about how the syscall interacts with memory management in QEMU.
+</think>
+
+The issue is related to how QEMU handles system calls involving memory mappings and their flags. Specifically, `shmat()` fails due to incompatible `mmap` settings.
+
+**Answer:** syscall
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