Currently, musl on Riscv64 does not implement VDSO for the clock_gettime function call. The following patch should fix it. (Rudimentary testing on a Riscv64 virtual machine confirms this works.) A similar patch could probably be made for Riscv32. This patch was made based on information from: https://man7.org/linux/man-pages/man7/vdso.7.html

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---
 arch/riscv64/syscall_arch.h | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/arch/riscv64/syscall_arch.h b/arch/riscv64/syscall_arch.h
index 7fd042cd..81993fc8 100644
--- a/arch/riscv64/syscall_arch.h
+++ b/arch/riscv64/syscall_arch.h
@@ -71,8 +71,7 @@ static inline long __syscall6(long n, long a, long b, long c, long d, long e, lo
 }
 
 #define VDSO_USEFUL
-/* We don't have a clock_gettime function.
 #define VDSO_CGT_SYM "__vdso_clock_gettime"
-#define VDSO_CGT_VER "LINUX_2.6" */
+#define VDSO_CGT_VER "LINUX_4.15"
 
 #define IPC_64 0
--
2.34.1