Overloaded mysql -1 ENOSYS (Function not implemented)

[Ondrej]

Hello,
last days I have a problem with overloaded server (VPS), I found that highes load is from mysql, then I click on trace link and here is short part of log there, thousands of lines like this,
do you have idea whats wrong or what I can do? Sorry for noob question, I use this VPS over year and never before I get this issue.

strace: Process 17709 attached
poll([{fd=20, events=POLLIN}, {fd=21, events=POLLIN}], 2, -1) = -1 ENOSYS (Function not implemented)
restart_syscall(<... resuming interrupted poll ...>) = -1 ENOSYS (Function not implemented)
fcntl(21, F_GETFL)                      = -1 ENOSYS (Function not implemented)
fcntl(21, F_SETFL, O_RDWR|O_NONBLOCK)   = -1 ENOSYS (Function not implemented)
accept4(21, 0x7fff250c51c0, [2], SOCK_CLOEXEC) = -1 ENOSYS (Function not implemented)
fcntl(21, F_SETFL, O_RDWR)              = -1 ENOSYS (Function not implemented)
fcntl(263, F_SETFD, FD_CLOEXEC)         = -1 ENOSYS (Function not implemented)
futex(0x55ab79b70c24, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x55ab79b70c20, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = -1 ENOSYS (Function not implemented)
futex(0x55ab79b6e220, FUTEX_WAKE_PRIVATE, 1) = -1 ENOSYS (Function not implemented)
poll([{fd=20, events=POLLIN}, {fd=21, events=POLLIN}], 2, -1) = -1 ENOSYS (Function not implemented)
fcntl(21, F_GETFL)                      = -1 ENOSYS (Function not implemented)
fcntl(21, F_SETFL, O_RDWR|O_NONBLOCK)   = -1 ENOSYS (Function not implemented)
accept4(21, 0x7fff250c51c0, [2], SOCK_CLOEXEC) = -1 ENOSYS (Function not implemented)