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2021-04-08T17:00:59.820+0000 7fb637efc700 10 MDSContext::complete: 25MDSInternalContextWrapper
2021-04-08T17:00:59.820+0000 7fb637efc700 10 MDSContext::complete: 16C_InodeValidated
2021-04-08T17:00:59.820+0000 7fb637efc700  0 log_channel(cluster) log [WRN] : Scrub error on inode 0x10000004506 (/client.0/tmp/clients/client3/~dmtmp/COREL) see mds.a log and `damage ls` output for details
2021-04-08T17:00:59.820+0000 7fb637efc700 -1 mds.2.scrubstack _validate_inode_done scrub error on inode [inode 0x10000004506 [...2,head] /client.0/tmp/clients/client3/~dmtmp/COREL/ auth{0=1} v28984 ap=2 f(v578 m2021-04-08T17:00:48.874199+0000 11=11+0) n(v49 rc2021-04-08T17:00:48.874199+0000 b2861056 12=11+1) (idft sync r=1) (inest sync r=1) (ifile sync r=1) (iversion lock) caps={4613=pAsLsXsFs/pAsLsXsFsx@2041} mcw={0=AsLsXsFs} | dirtyscattered=0 request=0 lock=3 importingcaps=0 dirfrag=1 caps=1 dirtyrstat=0 dirtyparent=0 replicated=1 dirty=0 waiter=0 authpin=1 scrubqueue=0 0x56514bcb2680]: {"performed_validation":true,"passed_validation":false,"backtrace":{"checked":true,"passed":true,"read_ret_val":0,"ondisk_value":"(3)0x10000004506:[<0x1000000445b/COREL v28984>,<0x1000000445a/~dmtmp v4075>,<0x10000000002/client3 v6685>,<0x10000000001/clients v3691>,<0x10000000000/tmp v2442>,<0x1/client.0 v2304>]//[]","memoryvalue":"(3)0x10000004506:[<0x1000000445b/COREL v28984>,<0x1000000445a/~dmtmp v4081>,<0x10000000002/client3 v6745>,<0x10000000001/clients v3691>,<0x10000000000/tmp v2442>,<0x1/client.0 v2304>]//[]","error_str":""},"raw_stats":{"checked":true,"passed":false,"read_ret_val":0,"ondisk_value.dirstat":"f(v0 m2021-04-08T17:00:46.663241+0000 15=15+0)","ondisk_value.rstat":"n(v0 rc2021-04-08T17:00:48.874199+0000 b2861056 12=11+1)","memory_value.dirstat":"f(v578 m2021-04-08T17:00:48.874199+0000 11=11+0)","memory_value.rstat":"n(v49 rc2021-04-08T17:00:48.874199+0000 b2861056 12=11+1)","error_str":"freshly-calculated rstats don't match existing ones"},"return_code":0}
2021-04-08T17:00:59.820+0000 7fb637efc700 20 mds.2.cache.ino(0x10000004506) scrub_finished

From: /ceph/teuthology-archive/pdonnell-2021-04-08_16:05:30-fs-wip-pdonnell-testing-20210408.142238-distro-basic-smithi/6028920/remote/smithi082/log/ceph-mds.a.log.gz

With https://github.com/ceph/ceph/pull/40520 which I plan to merge because it goes pretty far to clearing up the spurious scrub errors.