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In a guest virtual machine, we found that there is unexpected data zeroing problem detected occassionly: XFS (vdb): Mounting V5 Filesystem XFS (vdb): Ending clean mount XFS (vdb): Metadata CRC error detected at xfs_refcountbt_read_verify+0x2c/0xf0, xfs_refcountbt block 0x200028 XFS (vdb): Unmount and run xfs_repair XFS (vdb): First 128 bytes of corrupted metadata buffer: 00000000e0cd2f5e: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00000000cafd57f5: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00000000d0298d7d: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00000000f0698484: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00000000adb789a7: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 000000005292b878: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00000000885b4700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00000000fd4b4df7: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ XFS (vdb): metadata I/O error in "xfs_trans_read_buf_map" at daddr 0x200028 len 8 error 74 XFS (vdb): Error -117 recovering leftover CoW allocations. XFS (vdb): xfs_do_force_shutdown(0x8) called from line 994 of file fs/xfs/xfs_mount.c. Return address = 000000003a53523a XFS (vdb): Corruption of in-memory data detected. Shutting down filesystem XFS (vdb): Please umount the filesystem and rectify the problem(s) It turns out that the root cause is from the physical host machine. More specifically, it is caused by the ocfs2. when the page_size is 64k, the block should advance by 16 each time instead of 1. This will lead to a wrong mapping from the page to the disk, which will zero some adjacent part of the disk. Link: https://lkml.kernel.org/r/20240815092141.1223238-1-chizhiling@163.com Signed-off-by: Chi Zhiling <chizhiling@kylinos.cn> Suggested-by: Shida Zhang <zhangshida@kylinos.cn> Reviewed-by: Joseph Qi <joseph.qi@linux.alibaba.com> Reviewed-by: Heming Zhao <heming.zhao@suse.com> Cc: Mark Fasheh <mark@fasheh.com> Cc: Joel Becker <jlbec@evilplan.org> Cc: Junxiao Bi <junxiao.bi@oracle.com> Cc: Changwei Ge <gechangwei@live.cn> Cc: Gang He <ghe@suse.com> Cc: Jun Piao <piaojun@huawei.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.