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Linux kernel 6.8 fixes two serious problems in bcachefs

or1k

By or1k
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or1k

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Two serious problems were discovered (https://lore.kernel.org/lkml/v6czqjwdsso2hy6be7qeu4mqxsx4oydq6shavws4k7sexshcrp@np4inrse4e4p/T/) and fixed (https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=99bd3cb0d12e85d5114425353552121ec8f93adc) in the bcachefs file system, which has been part of the Linux kernel since 6.7, in preparation for the 6.8 kernel release (the fixes will be part of the 6.8-rc4 release).

- The first issue is related to incorrect locking when working with directories, so that when deleting non-existent subvolumes, the first deletion attempt could result in an error and the second attempt could hang due to leaving an unreleased lock.

- In the second case, a race condition occurred, which could lead to premature thread termination in the kernel when closing files.

The problems are present in all versions of bcachefs since the original pull request in kernel 6.7. Both problems are considered serious enough to backport the proposed patch to the stable 6.7 kernel branch.

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