[Libguestfs] Long running nbdkit instances seem to leak memory

I'm using nbdkit + the file plugin to serve NBD root filesystems for some machines, so I get to observe how it behaves for very long runs. I think this indicates a memory leak? PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 5038 root 20 0 4577220 16000 796 S 0.0 0.1 30:52.40 nbdkit 5592 root 20 0 4159224 11708 784 S 0.0 0.1 22:21.67 nbdkit Not sure how to easily diagnose this. My thought was to force a coredump by sending a signal, but I don't know if these processes have a suitable rlimit. I could also attach gdb. Perhaps by looking at a dump of the memory we could get an idea of what structure leaks. Unfortunately also it's a very old version: $ rpm -qf /usr/sbin/nbdkit nbdkit-1.8.0-1.el7.x86_64 Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com virt-top is 'top' for virtual machines. Tiny program with many powerful monitoring features, net stats, disk stats, logging, etc. http://people.redhat.com/~rjones/virt-top