Hi, I have the same problem. Except for me the bug doesn't trigger with the upper-right 3-dot menu, rather, it triggers when I right click for the context menu in the dev tools, as well as regular HTML <select> elements in webpages.
When I right click for a context menu or left click on <select> elements, the whole chromium hangs. After around 10 seconds, the following message is printed on the console: --- [1391245:7:0119/164748.438014:ERROR:command_buffer_proxy_impl.cc(328)] GPU state invalid after WaitForGetOffsetInRange. [1387822:1387822:0119/164748.438696:ERROR:command_buffer_proxy_impl.cc(328)] GPU state invalid after WaitForGetOffsetInRange. [1387822:1387822:0119/164748.475519:ERROR:gpu_process_host.cc(968)] GPU process exited unexpectedly: exit_code=512 si_init_perfcounters: max_sh_per_se = 2 not supported (inaccurate performance counters) [1394246:1394246:0119/164748.562847:ERROR:sandbox_linux.cc(378)] InitializeSandbox() called with multiple threads in process gpu-process. [1391305:7:0119/164748.596493:ERROR:command_buffer_proxy_impl.cc(125)] ContextResult::kTransientFailure: Failed to send GpuControl.CreateCommandBuffer. ---- Desktop environment: KDE Plasma Kernel: 5.13.0-23-generic #23-Ubuntu SMP Fri Nov 26 11:41:15 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux Version: 97.0.4692.71 Rev: 1864 -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to chromium-browser in Ubuntu. https://bugs.launchpad.net/bugs/1927205 Title: Chromium menu is blank and freezes application Status in chromium-browser package in Ubuntu: Confirmed Bug description: When opening the Chromium menu (3 dots button), it shows an empty blank white box. Very often it also freezes the whole application for about 10 seconds Installed version: name: chromium summary: Chromium web browser, open-source version of Chrome publisher: Canonical✓ store-url: https://snapcraft.io/chromium contact: https://bugs.launchpad.net/ubuntu/+source/chromium-browser/+bugs?field.tag=snap license: unset description: | An open-source browser project that aims to build a safer, faster, and more stable way for all Internet users to experience the web. commands: - chromium.chromedriver - chromium snap-id: XKEcBqPM06H1Z7zGOdG5fbICuf8NWK5R tracking: latest/stable refresh-date: 6 days ago, at 08:45 EEST channels: latest/stable: 90.0.4430.93 2021-04-28 (1568) 145MB - latest/candidate: 90.0.4430.93 2021-04-28 (1568) 145MB - latest/beta: 91.0.4472.19 2021-04-28 (1566) 148MB - latest/edge: 92.0.4496.0 2021-05-05 (1575) 148MB - installed: 90.0.4430.93 (1568) 145MB - Ubuntu version Description: Ubuntu 21.04 Release: 21.04 DE: plasmashell 5.21.4 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/chromium-browser/+bug/1927205/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp

