This is attempt #3 to submit this issue to this mailing list. I don't expect this to be received. I give up. I have an issue with MDS corruption which so far I haven't been able to resolve using the recovery steps I've found online. I'm on v15.2.6. I've tried all the recovery steps mentioned here, except copying the pool: https://docs.ceph.com/en/latest/cephfs/disaster-recovery-experts/ When I try to start an MDS instance, it crashes after a few seconds. It logs a bunch of "bad backtrace on directory inode" errors before failing on an assertion in MDCache::add_inode, line 313: https://github.com/ceph/ceph/blob/cb8c61a60551b72614257d632a574d420064c17a/… Here's the output of journalctl -xe: https://pastebin.com/9g1UJaKQ I asked in the IRC channel, and it was suggested I might be able to manually delete the duplicate inodes using the RADOS API, though I don't know specifically how I would do that. I have also cloned the code and built Ceph with the problem assertion replaced with a return, but I haven't tried using it yet and I'm saving that as my last resort. I'd appreciate any help you all can give. Thank you, - Brandon Lyon