Okay, I've uploaded the images. Here are the links:
https://i.imgur.com/zAohUmm.png
https://i.imgur.com/SVp7x6R.png
https://i.imgur.com/F97A6b3.png
On Tue, 11 Aug 2020 at 20:21, Christopher Schultz <
ch...@christopherschultz.net> wrote:
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> Alex,
>
> On 8/11/20 11:47, Alex Maltinsky wrote:
> > Hi Folks
> >
> > We ran into what looks like a memory leak in tomcat 8.5.57 on
> > Ubuntu 18.04 running on Openjdk 11.0.5
> >
> > Our app maintains permanent websocket connections with multiple
> > clients (also written in Java, using the Tyrus websocket client -
> > version 1.13.1). Recently, a few clients began misbehaving. They're
> > opening multiple websocket sessions in parallel which our app
> > doesn't allow. When this happens, the app closes the previous
> > websocket session and starts talking to the client over the new one
> > session exclusively. This issue happened to two of our clients that
> > have a bunch of network connectivity issues which somehow triggered
> > this behavior. However, I'm not here to debug the misbehaving
> > clients, the client issue is being investigated in parallel.
> > However, it appears that this behavior triggered a memory leak in
> > tomcat. Slowly but surely our heap keeps filling up with byte
> > arrays that seem to have come from the misbehaving clients (we know
> > this from the contents of the arrays). Below are the paths to the
> > gc roots for a few of these arrays that contain data from one such
> > client. The heap dump was taken *over an hour after the client was
> > blocked by its IP address using iptables*. So we believe there's no
> > reason for these buffers to still exist in memory. Please note that
> > the path to the GC roots are all inside tomcat, our app is nowhere
> > to be found.
> >
> > We would appreciate any guidance or suggestions.
> >
> > Thanks!
> >
> > image.png
> >
> > image.png
> >
> > image.png
>
> Your image attachments have been removed. Can you post them elsewhere
> + links in your message, or transcribe them into text?
>
> Alternatively, do you have a simple test case that reproduces the proble
> m?
>
> - -chris
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