晓查 发自 凹非寺
量子位 报道 | QbitAI
在美国的大雪天气影响下，Linux之父Linus Torvalds的家经历了6天断电，但他还是2月底赶出了5.12-rc1内核。
然而，事情不到一周却发生了转折。
Linus本周给Linux内核邮件组的发去了一封警告邮件：我刚发布的5.12-rc1内核你们千万别用！
你们中的某些人可能已经注意到，在我的公共git树中，“ v5.12-rc1”标记已经神奇地重命名为“ v5.12-rc1-dontuse”。
Linus之所以用“不要使用”（dontuse）来标记这些代码，是因为可能破坏交换文件（swapfile）的处理。具体来说，更新后的代码会丢失指向交换文件开头的适当偏移量，可能导致灾难性的后果。
当发生此错误时，系统不仅会覆盖现有文件中的数据，还会覆盖大量的元数据，这些元数据的损坏可能会导致整个文件系统无法安装和使用。
如果你根本不使用交换文件，那么这个问题不会造成任何伤害。因为许多Linux发行版仍然默认交换分区，而不是交换文件。
但是，应用最广的发行版Ubuntu默认使用交换文件。如果你是Ubuntu或以Ubuntu为基础的发行版（如Mint）用户，那么这个错误可能会破坏你整个根文件系统。
昨天，Linus已经发布了5.12-rc2，修复了这个错误。
不过，对Linux用户来说，还是不要轻易使用未经充分测试的rc版代码。这类早期发布的内核版本可能会带来非常严重的bug，并不适合部署到生产中。
参考链接：
https://arstechnica.com/gadgets/2021/03/psa-linux-folks-stay-away-from-the-5-12-rc1-kernel/
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