I have same problem, + it hangs when I click on <select> html items 
It looks to be connected with GPU (I have AMD Ryzen 7 4750U CPU with Radeon 
graphics).
After chromium hangs, it took about 10 seconds to restart chromium. These log 
messages appears in console:

[120832:120832:1217/115511.669028:ERROR:command_buffer_proxy_impl.cc(328)] GPU 
state invalid after WaitForGetOffsetInRange.
[120832:120832:1217/115511.676066:ERROR:gpu_process_host.cc(967)] GPU process 
exited unexpectedly: exit_code=512
si_init_perfcounters: max_sh_per_se = 2 not supported (inaccurate performance 
counters)
[122614:122614:1217/115511.784632:ERROR:sandbox_linux.cc(376)] 
InitializeSandbox() called with multiple threads in process gpu-process.


When chromium app starts, this messages are shown:

si_init_perfcounters: max_sh_per_se = 2 not supported (inaccurate performance 
counters)
[120938:120938:1217/114538.723373:ERROR:sandbox_linux.cc(376)] 
InitializeSandbox() called with multiple threads in process gpu-process.
[120832:120925:1217/114541.025791:ERROR:chrome_browser_main_extra_parts_metrics.cc(226)]
 crbug.com/1216328: Checking Bluetooth availability started. Please report if 
there is no report that this ends.
[120832:120925:1217/114541.025815:ERROR:chrome_browser_main_extra_parts_metrics.cc(229)]
 crbug.com/1216328: Checking Bluetooth availability ended.
[120832:120925:1217/114541.025819:ERROR:chrome_browser_main_extra_parts_metrics.cc(232)]
 crbug.com/1216328: Checking default browser status started. Please report if 
there is no report that this ends.
[120832:120965:1217/114541.072325:ERROR:udev_watcher.cc(98)] Failed to begin 
udev enumeration.
[120832:120925:1217/114541.155048:ERROR:chrome_browser_main_extra_parts_metrics.cc(236)]
 crbug.com/1216328: Checking default browser status ended.
Warning: disabling flag --expose_wasm due to conflicting flags



Kernel: Linux 5.11.0-41-generic #45~20.04.1-Ubuntu SMP Wed Nov 10 10:20:10 UTC 
2021 x86_64 x86_64 x86_64 GNU/Linux
Not installed AMD PRO drivers

Version:
Chromium        96.0.4664.110 (Official Build) snap (64-bit)
Revision        
d5ef0e8214bc14c9b5bbf69a1515e431394c62a6-refs/branch-heads/4664@{#1283}
OS      Linux
JavaScript      V8 9.6.180.21
User Agent      Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like 
Gecko) Chrome/96.0.4664.110 Safari/537.36
Command Line    /snap/chromium/1854/usr/lib/chromium-browser/chrome 
--password-store --flag-switches-begin --flag-switches-end 
--origin-trial-disabled-features=CaptureHandle
Executable Path /snap/chromium/1854/usr/lib/chromium-browser/chrome
Profile Path    /home/michal/snap/chromium/common/chromium/Default
Variations      b56a9ab2-5558097f

-- 
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


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