Is there documentation/explainer for this? I've been trying to understand more about this (was this a change in Windows 11? Is it only when WSL2 is installed?) for a while now, but not found anything apart from stray HN comments every now and then.
That Windows is then running virtualized is just how Hyper-V works, as soon as you turn on Hyper-V the host Windows runs as a guest in Hyper-V, though with special privileges [1]
https://learn.microsoft.com/en-us/virtualization/hyper-v-on-...
WSL1 is not an NT subsystem, either. WSU (the POSIX subsystem) was an actual NT subsystem, but with WSL, they abandoned this concept and went with a different design for performance reasons.
This is still a problem with WSL2, at least on my WSL2 with Windows file system mappings.
I tried to use instructions that use fossil from the hctree page: https://sqlite.org/hctree/doc/hctree/doc/hctree/index.html
Fossil employs sqlite to store SCM information and it fails with "SQLITE_IOERR(1290): os_unix.c:39533: (22) fsync(...)" error, which is the same with VirtualBox: https://www.fossil-scm.org/forum/forumpost/7fb6c96d80?t=c
So WSL2, having to put up with Windows quirks, is not much a Linux anymore. It is slow and some programs can't even run.
But if WSL2 is given its own drive to mount and do what it wants with it, the issue should disappear.
And when WSL2 supports passing partitions, the issue will vanish.
https://en.m.wikipedia.org/wiki/Hypervisor#Classification
https://learn.microsoft.com/en-us/windows-server/administrat...