Finding the processes trying to open some FIFO

In my example, the wc program is trying to open the test FIFO or named pipe. These in-progress open syscalls seem not to be shown by fuser or lsof:

mknod /tmp/testpipe p
wc /tmp/testpipe &
timeout 0.2 strace -p $! |& timeout 0.1 cat; echo
strace: Process 10103 attached
open("/tmp/testpipe", O_RDONLY

fuser /tmp/testpipe  # no output
lsof | grep testpipe  # no output

How to find processes trying to open some FIFO in Linux systems ?