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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/2825
parent96049c939b1916d80532630d63c14e04d5244f1d (diff)
downloademulator-bug-study-238ec2b7cc1557d6f34c33cc482e4d0cd3e266dd.tar.gz
emulator-bug-study-238ec2b7cc1557d6f34c33cc482e4d0cd3e266dd.zip
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+<think>
+Okay, so I'm trying to classify this bug report as part of QEMU. The user mentioned that when using execveat with an empty filename and AT_EMPTY_PATH flag on different architectures like arm64, arm, riscv64, etc., it returns ENOENT (No such file or directory). However, for x86_64 and x86, it works fine.
+
+First, I need to understand what's happening here. execveat is a system call that allows executing a program from a file descriptor. The AT_EMPTY_PATH flag tells the kernel that the filename is empty, meaning the path comes from the file descriptor provided. On some architectures, this isn't working as expected.
+
+The user also mentioned using binfmt_misc which is used to register interpreters for different binary formats (like QEMU for running foreign binaries). When binfmt_misc is enabled, it allows these foreign binaries to run by translating them on-the-fly.
+
+Looking at the test cases:
+- For x86_64 and x86, everything works fine when using execveat with AT_EMPTY_PATH.
+- For other architectures (aarch64, riscv64), it fails with ENOENT when using AT_EMPTY_PATH but works if they use /proc/self/fd/%d as the pathname.
+
+The error seems to be happening in how the system call is handled for different architectures. Since execveat is a syscall and this behavior varies across architectures, especially when using QEMU's binfmt_misc setup, it points towards an issue with how the system handles foreign binaries or specific syscalls under QEMU.
+
+The possible categories given are instruction, syscall, runtime. The problem here isn't about faulty instructions in the code (so not 'instruction'). It also doesn't seem to be a general runtime error unrelated to system calls. Instead, it's specifically about the execveat system call failing under certain conditions when running different architectures with QEMU.
+
+Therefore, this bug falls under the 'syscall' category because it's related to how the execveat system call is being handled or emulated by QEMU for foreign architectures.
+</think>
+
+The issue arises from how the `execveat` system call is being processed for different architectures within QEMU. The error occurs specifically when using this syscall with an empty path and AT_EMPTY_PATH flag, which works for some arches but not others. This indicates a problem in handling syscalls across various architectures.
+
+**Answer:** syscall
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