LKML: Linus Torvalds: Re: [BREAKAGE] Since 4.18, kernel sets SB_I_NODEV implicitly on userns mounts, breaking systemd-nspawn
https://lkml.org/lkml/2018/12/22/221
"...We have very clear rules in the kernel: if some change breaks existing
setups, it is ABSOLUTELY NEVER the application that is broken.
It is the kernel. ..."
（引用つづく）
フォロー
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（ちょい略）
"... Eric, I want to make this 1000% clear: there are no user space bugs.
If it used to work, then user space was clearly doing the right thing.
The fact that you tried to several times claim it was buggy user space
is a serious breach of trust. You KNOW this is the case.
Seriously. There are no excuses ..."
