Hello Michael, I am seeing a similar issue but only when using the kernel 5.10.0-15-amd64 on the virtual host.
I run Firefox inside a virtual machine. Both the host and the virtual guest run Debian Bullseye and both are fully patched. If I run the following setup then everything is OK Host: 5.10.0-14-amd64 (version '14' kernel) Guest: 5.10.0-15-amd64 (version '15' kernel) If I run the following setup then Firefox crashes regularly Host: 5.10.0-15-amd64 (version '15' kernel) Guest: 5.10.0-15-amd64 (version '15' kernel) The only difference is the kernel version on the virtual host. Firefox never sees this kernel so I do not think this is a Firefox issue. There seems to be some regression in the newer kernel version. I have found it very difficult to track down what the issue is but it is completely reproducible. Could you try booting the 5.10.0-14-amd64 kernel on the host to see if your problem disappears? Does anyone have any suggestions what can be done to track down this issue? Regards, Richard
