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authorChristian Krinitsin <mail@krinitsin.com>2025-07-07 17:18:14 +0000
committerChristian Krinitsin <mail@krinitsin.com>2025-07-07 17:18:14 +0000
commit61361f925d4914a6608a0076e64cc2399311ed5f (patch)
tree6f717c2ff0b11d7493e60da9757818d119cfb541 /results/classifier/qwen3:32b/reasoning/syscall/1805913
parent238ec2b7cc1557d6f34c33cc482e4d0cd3e266dd (diff)
downloadqemu-analysis-61361f925d4914a6608a0076e64cc2399311ed5f.tar.gz
qemu-analysis-61361f925d4914a6608a0076e64cc2399311ed5f.zip
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+<think>
+Okay, let's see. The user is describing a bug where readdir() returns NULL with errno EOVERFLOW when using 32-bit user-static QEMU on a 64-bit host. They provided a code example and steps to reproduce. The root cause seems to be in glibc's handling of getdents64, checking if inode numbers and offsets fit into 32-bit ranges. The problem arises because QEMU is passing through 64-bit inode numbers from the host kernel, which are too large for the 32-bit application's expectations.
+
+The user mentions that on real hardware with a 32-bit kernel, the inode numbers are 32-bit, so it works. But in QEMU's case, since it's emulating a 32-bit user space on a 64-bit host, the syscall (getdents64) returns 64-bit values. The glibc code checks for 32-bit compatibility and triggers EOVERFLOW when the values are out of range. 
+
+The question is to classify this bug into one of the categories: instruction, syscall, or runtime. 
+
+The issue is related to how syscalls are handled. Specifically, the getdents64 syscall is returning data that the 32-bit application can't handle because the values are too big. The problem stems from the syscall interface between the 32-bit user space and the 64-bit kernel. QEMU is supposed to translate syscalls appropriately, but here it's passing through the 64-bit inode numbers directly, which leads to the overflow. 
+
+Since the core of the problem is the syscall (getdents64) returning values that are incompatible with the 32-bit application, the correct category would be "syscall". The error arises from how the syscall's data is handled between the host and the emulated environment.
+</think>
+
+syscall
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