Range, and number of supported devices
The critical thing to understand is namespaces are visibility walls, not security boundaries. They prevent a process from seeing things outside its namespace. They do not prevent a process from exploiting the kernel that implements the namespace. The process still makes syscalls to the same host kernel. If there is a bug in the kernel’s handling of any syscall, the namespace boundary does not help.
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In 2019, 2020 and 2021 the sea ice was relatively stable and significant feather mounds were visible.
And for those who say Old English is more like German... look how far we got without using it at all! Though at this point, it would be helpful: