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: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA256 > > 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 > -----BEGIN PGP SIGNATURE----- > Comment: Using GnuPG with Thunderbird - https://www.enigmail.net/ > > iQIzBAEBCAAdFiEEMmKgYcQvxMe7tcJcHPApP6U8pFgFAl8y04IACgkQHPApP6U8 > pFhoSBAAjLc+roLwg8Qj7HVaHXGWOyucUqAsQOa7jMucQTQkMfs3PiuIfkMxvRp0 > SdRU0uK81E3gIjkwtjeACyeqZIxjExI2RIIe/A4kwtqcZmHkvE/wgayaWM4ncLlI > tIrppKyEOb3G5aRwoRlaJ4TZxcm7EnvDKVLC8XTPZeQUtoKBS7zeVQFUZiW72gkM > UU2RllLITeFsjTZGZfQ6I++XHOgrOMKhvswkxRl0zwSzBZM4Sg44xBUKQPj6b8iQ > d3t6Z9Cy2ynTP1idI1reqEXHeajHLcrlG3VwDwOzQhhgN0TXL+5HEzomAFin9eaI > D59tPPEClBmP1+1C3/Bse8XYOTUdDIzA7EoSEgXsaaQbkMmapUx6XUH1l0CGlzhI > oMUvzkvmMuM4k/MLkD7elsG3YTORLK+ouuwd5gDd6o3xfSy3FXgsAbYxpRMQ/vcs > zkuJ9trREe9uKCsb/MCtLx4cms3ndTo/Q44cEmpdHVMCeQNKnBeQzn9icEzJU7ib > cF6fIHoI6ifLw9v1nzO1Lr/v3LiDm2WoptUZSLOcB0+dhaz+gLCId9gz6A0yw2DQ > VzufR5whkZezS/6Rm40J6r8jLItrXfUALm6eDmulfGDUU6Y9JjQe/oUDdQYArKTE > lVU7JBCc/4wVrZL6DsfnqDecfprRI01wTjXSJ8IP9s6xega2Czc= > =R1Cn > -----END PGP SIGNATURE----- > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org > For additional commands, e-mail: users-h...@tomcat.apache.org > >
