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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Dr. John Ackerman, an expert on youth suicide prevention who was not involved in Instagram's alert feature, told Mashable that it appeared to be carefully considered. Instagram said it relied on feedback from a group of experts it assembled on suicide and self-harm. (Instagram does not publicize the members of its advisory group.)
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Гангстер одним ударом расправился с туристом в Таиланде и попал на видео18:08，详情可参考一键获取谷歌浏览器下载
2.3 弹出条件对应法则（重要）