Linux Kernel 6.10 RC5 Released: Key Updates and Bcachefs Fixes

Linux Kernel 6.10's fifth version candidate (RC5) is released: stability continues to improve

Linus Torvalds, the creator of the Linux kernel, announced the release of the fifth candidate for Linux kernel 6.10 (RC5). The development of version 6.10 is progressing smoothly and no major problems have occurred.

Torvalds provides an overview of the current kernel development status in the Linux kernel mailing list updated on June 23.

Torvalds said the development of version 6.10 has been very stable so far, and RC5 continues this positive trend. He hopes that this steady progress will last for the rest of the development cycle.

Table of contents

- Changes to Linux kernel RC5

• Bcachefs fix in Linux kernel 6.10 RC5
• Test Linux kernel 6.10 RC5

Changes to Linux kernel RC5

Interestingly, changes to device drivers that usually take up most of the kernel updates, account for only about one-third of the modifications in RC5. Even in this category, most of the changes focus on several specific areas:

1. Hyper-V balloon driver (hv_balloon)
2. Broadcom's bnxt network driver
3. A Qualcomm PHY (physical layer) driver

Although there are other driver updates, none of them are particularly extensive.

The remaining changes cover various areas of the kernel:

• bcachefs file system repair
• Network self-test improvement
• Document updates
• Virtual Memory (VM) Enhancement
• Core network adjustment
• Secondary architecture-specific modifications

Bcachefs fix in Linux kernel 6.10 RC5

Like RC4, Linux kernel RC5 also contains many fixes and improvements specifically for the bcachefs subsystem.

bcachefs file system is a modern copy-on-write (CoW) file system for Linux, and has received several important fixes in this candidate version.

Here is a summary of the key changes:

• Fixed the initialization order of the srcu barrier in bcachefs.
• Solved the problem of array index crossing boundaries.
• Fixed locking problem in do_discard_fast() function.
• Solved the shift overflow problem in the read_one_super() function.
• Adjusted the bitmask for btree ID in bcachefs.
• Added a check to detect invalid btree ID.
• Improved error handling in the early initialization phase of log code.
• Eliminates the need to convert delete_dead_snapshots() to read and write mode.
• Security measures to prevent LRU_TIME_BITS overflow are implemented.
• Enhanced LRU surround processing of cached data.
• Fixed the bch2_sb_downgrade_update() function.
• Updated set_worker_desc() for delete_dead_snapshots.
• Fixed bch2_trans_put() function.
• Set security errors to default values ​​for improved reliability.
• Change BUG_ON() to WARN_ON() provides more informative warnings in the closure.
• Added the missing alloc_data_type_set() function.
• Replace naked EEXIST errors with private error codes for more specific error handling.
• Resolved I_NEW warning in the race condition path of bch2_inode_insert().
• Use bch2_print_string_as_lines to display longer error messages.
• Fixed the use-after-free (UAF) issue that occurred after write_super().

Torvalds noted that the changes in RC5 are diverse, but are not unusual or worrying for version 6.10. He said the complete change log is available for those interested in technical details.

Test Linux kernel 6.10 RC5

Users are encouraged to download the latest version candidates from the Kernel.org website or Linus Torvalds git tree for testing.

Note that because these development versions are experimental, they should not be used on production systems.

Next read:

• Linux Kernel 6.10 RC6 Release: Calm and Focused Update

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