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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/833
parent238ec2b7cc1557d6f34c33cc482e4d0cd3e266dd (diff)
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+<think>
+Okay, let's see. The user is reporting an issue with QEMU where the sendmsg system call fails when there's a zero-length iov but ancillary data is present. They provided a test case and mentioned that it works on native Linux but not under QEMU. The problem is that when running under QEMU, the sendmsg call that should have msg_iovlen=0 isn't being made, but instead, only the one with msg_iovlen=1 is. The strace output shows that in the native case, two sendmsg calls are made, but under QEMU, only one. 
+
+So the key here is that QEMU isn't correctly handling the sendmsg system call when there's no I/O vector (iov) provided, even though there's ancillary data. The user says that the sendmsg call with msg_iovlen=0 is missing in QEMU. 
+
+The possible categories are instruction, syscall, or runtime. 
+
+The issue is with the sendmsg system call. The problem occurs when QEMU processes the sendmsg syscall. The native Linux kernel handles it correctly, but QEMU's emulation of the syscall isn't handling the case where there's no iov but there is ancillary data. 
+
+So this is a syscall issue. The QEMU's syscall emulation isn't correctly handling the parameters, specifically when msg_iovlen is 0 but there's ancillary data. The user's problem is directly related to how the syscall is implemented or emulated in QEMU. 
+
+It's not an instruction error because there's no mention of incorrect machine instructions. It's not a runtime error in the general sense, but specifically a syscall handling problem in QEMU. So the correct category is syscall.
+</think>
+
+syscall
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