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Home > Linux > Linus Torvalds warned against a bug in Linux 5.12 rc1

Linus Torvalds warned against a bug in Linux 5.12 rc1

Linus Torvalds issued a warning to avoid the first release candidate of the Linux 5.12 due to a bug that can damage a computer's filesystem.

Erdem Yasar by Erdem Yasar
March 9, 2021
in Linux
2 min read
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Linus Torvalds warned against a bug in Linux 5.12 rc1
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Despite the snowstorms knocking the power out in Portland, where Linus Torvalds’ house is located, Torvalds and contributors managed to release the version RC 5.12 on time. However, Torvalds announced in the mailing list that the first release candidate of Linux kernel 5.12 includes a bug that can affect a computer’s filesystem.

v5.12-rc1-dontuse

Linus Torvalds, Developer, Linux kernel
Linus Torvalds, Developer, Linux kernel

Torvalds announced that in his public git, the “v5.12-rc1” tag has been renamed to “v5.12-rc1-dontuse”. The release includes a “nasty bug” and swap files stopped working and the offset of the start of the swap file was lost. Swapping still happened, but it happened to the wrong part of the filesystem. Linus Torvalds, Developer, Linux kernel, said,

“Yes, this is very unfortunate, but it really wasn’t a very obvious bug, and it didn’t even show up in normal testing, exactly because swapfiles just aren’t normal. So I’m not blaming the developers in question, and it also wasn’t due to the odd timing of the merge window, it was just simply an unusually nasty bug that did get caught and is fixed in the current tree.

Now, there’s a couple of additional reasons for me writing this note other than just “don’t run 5.12-rc1 if you use a swapfile”. Because it’s more than just “ok, we all know the merge window is when all the new scary code gets merged, and rc1 can be a bit scary and not work for everybody”. Yes, rc1 tends to be buggier than later rc’s, we are all used to that, but honestly, most of the time the bugs are much smaller annoyances than this time.”

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Erdem Yasar

Erdem Yasar

Erdem Yasar is a news editor at Cloud7 News. Erdem started his career by writing video game reviews in 2007 for PC World magazine while he was studying computer engineering. In the following years, he focused on software development with various programming languages. After his graduation, he continued to work as an editor for several major tech-related websites and magazines. During the 2010s, Erdem Yasar shifted his focus to cloud computing, hosting, and data centers as they were becoming more popular topics in the tech industry. Erdem Yasar also worked with various industry-leading tech companies as a content creator by writing blog posts and other articles. Prior to his role at Cloud7 News, Erdem was the managing editor of T3 Magazine.

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