[Libguestfs] Long running nbdkit instances seem to leak memory

[Nikolay Ivanets]

May I ask for self-education, how did you conclude memory leak, based on
that, I guess, 'ps' output?

--
  Mykola Ivanets

пн, 10 серп. 2020, 10:48 користувач Richard W.M. Jones <rjones at redhat.com>
пише:

> 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
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