Okay, I need to classify this bug report into one of the given categories: instruction, syscall, or runtime. Let me read through the report carefully. The issue is about time functions malfunctioning when using QEMU's ppc64le emulator in user mode. Specifically, Go's time.NewTicker() and time.Sleep() aren't working correctly—they revert to 1-second intervals instead of the intended shorter durations. This problem started after Go switched to using vDSO for clock_gettime on PowerPC64 in version 1.12. From what I understand, the issue doesn't occur when running on actual hardware or with other architectures emulated by QEMU. It's specific to ppc64le and happens only when using the vDSO path. The problem arises because Go changed how it calls clock_gettime—now using vDSO instead of syscalls. So, the problem seems related to how QEMU is handling vDSO calls for clock_gettime on ppc64le. Since the issue doesn't occur with actual hardware or when using syscalls (which are different from vDSO), it points towards an emulation bug in QEMU's user-mode for this specific architecture. The categories given are instruction, syscall, and runtime. The issue is about system call handling via vDSO, which is a type of optimized call that doesn't go through the standard syscall mechanism. However, since vDSO is related to how syscalls are handled in userspace, it's likely a syscall category issue. Therefore, I think this bug should be classified under 'syscall' because it relates to the handling of clock_gettime calls via vDSO in user-mode emulation. The problem occurs during the handling of clock_gettime via vDSO, which is related to system call handling. Therefore, the appropriate classification is: **syscal** But since the options are instruction, syscall, or runtime, and this issue relates to how syscalls (specifically through vDSO) are handled in QEMU's user-mode emulation, it falls under 'syscall'. **syscall**