[lvm-devel] [QUESTION] lvmcache_label_scan: checksum error at offset xxx

[David Teigland]

On Thu, Jun 10, 2021 at 05:19:17PM +0800, Wu Guanghao wrote:

> lvm[708341]: /dev/ram0: Checksum error at offset 203776
> lvm[708341]: WARNING: invalid metadata text from /dev/ram0 at 203776.
> lvm[708341]: WARNING: metadata on /dev/ram0 at 203776 has invalid summary for VG.
> lvm[708341]: WARNING: bad metadata text on /dev/ram0 in mda1
> lvm[708341]: WARNING: scanning /dev/ram0 mda1 failed to read metadata summary.

> lvm[639523]: WARNING: Metadata location on /dev/ram0 at 464384 begins with invalid VG name.
> lvm[639523]: WARNING: bad metadata text on /dev/ram0 in mda1
> lvm[639523]: WARNING: scanning /dev/ram0 mda1 failed to read metadata summary.

Hi, I'm not sure if these specific errors would be caused by the lock-less
label scan.  I would expect lvm to read valid but old metadata (which it
expects to find on occasion because of the lock-less scan.)  The full
command debugging along with a dd of the ondisk metadata areas would be
most helpful.

Thanks,
Dave