Hi,

I trimmed a lot of useful context only because I don't have
anything terribly useful to say about it.

Jordan Metzmeier wrote:
> jmetzmeier@localhost:/tmp $ df -hT /tmp
> Filesystem     Type   Size  Used Avail Use% Mounted on
> tmpfs          tmpfs   16G  3.5G   13G  22% /tmp
> 
> However, `du` does not show 3.5GB of files inside:
> 
> jmetzmeier@localhost:/tmp $ sudo du -sh ./
> 32K     ./
> 
> Does anyone know what could be happening here? Does writing a file to
> tmpfs and then deleting it cause the tmpfs to retain that allocated
> memory until reboot?
> 
> My system is running Fedora 34. I have ensured nothing is mounted over
> top of /tmp and hiding files.

I don't know if there are subtle issues because this is a
memory-based tmpfs filesystem.  But in general, you can see
something like this if a process opens a file and keeps it
open after it's deleted.  The space used by that file isn't
freed until the process which has it open exits (or closes
the file).

You can look for that sort of thing with the lsof command:

    sudo lsof -a +L1 /tmp

Maybe that will point to what's taking up the space.

-- 
Todd

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