【 在 dajun 的大作中提到: 】 : : 真的root, 放狗找到答案了: : https://unix.stackexchange.com/questions/503111/group-permissions-for-root-not-working-in-tmp : : The behavior you are showing seems to depend on the fs.protected_regular Linux kernel parameter, introduced along with fs.protected_fifos by this commit (converged in version 4.19, I believe), with the aim to fix security vulnerabilities.