Hi all,

We rebooted all the nodes in our 17.2.5 cluster after performing kernel 
updates, but 2 of the OSDs on different nodes are not coming back up. This is a 
production cluster using cephadm.

The error message from the OSD log is ceph-osd[87340]:  ** ERROR: unable to 
open OSD superblock on /var/lib/ceph/osd/ceph-665: (2) No such file or directory

The error message from ceph-volume is 2023-08-23T16:12:43.452-0500 7f0cad968600 
 2 
bluestore(/dev/mapper/ceph--febad5a5--ba44--41aa--a39e--b9897f757752-osd--block--87e548f4--b9b5--4ed8--aca8--de703a341a50)
 _read_bdev_label unable to decode label at offset 102: void 
bluestore_bdev_label_t::decode(ceph::buffer::v15_2_0::list::const_iterator&) 
decode past end of struct encoding: Malformed input

We tried restarting the daemons and rebooting the node again, but still see the 
same error.
Has anyone experienced this issue before? How do we fix this?

Thanks,
Alison
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