Ramana - please take a look.
Kotresh, I'll ask for the full sosreports from both of these nodes note : The event the CU mentioned was at 23:31 - not 3:50am May 15 23:31:18 lwtxe04kpapd1i ceph-1f483d8e-8469-11ec-8e59-d0bf9cf275c8-mds-root-lwtxe04kpapd1i-dqrnxn[3712153]: debug 2022-05-16T04:31:18.286+0000 7f84fb568700 1 mds.root.lwtxe04kpapd1i.dqrnxn Map removed me [mds.root.lwtxe04kpapd1i.dqrnxn{0:1133202} state up:standby-replay seq 1 join_fscid=1 addr [v2:171.176.38.198:6800/3401903807,v1:171.176.38.198:6801/3401903807] compat {c=[1],r=[1],i=[7ff]}] from cluster; respawning! See cluster/monitor logs for details. May 15 23:31:17 lwtxe04kpapd1i ceph-1f483d8e-8469-11ec-8e59-d0bf9cf275c8-mon-lwtxe04kpapd1i[124408]: cluster 2022-05-16T04:31:16.215532+0 000 mgr.lwtxe04hpapd1i.qifige (mgr.1044249) 79907 : cluster [DBG] pgmap v80007: 4161 pgs: 23 active+clean+scrubbing+deep, 4138 active+cle an; 22 TiB data, 67 TiB used, 117 TiB / 183 TiB avail; 8.6 MiB/s rd, 982 KiB/s wr, 298 op/s May 15 23:31:17 lwtxe04kpapd1i ceph-1f483d8e-8469-11ec-8e59-d0bf9cf275c8-mon-lwtxe04kpapd1i[124408]: debug 2022-05-16T04:31:17.616+0000 7 f35ac1ff700 1 mon.lwtxe04kpapd1i@3(peon).osd e22029 e22029: 168 total, 168 up, 168 in May 15 23:31:17 lwtxe04kpapd1i ceph-1f483d8e-8469-11ec-8e59-d0bf9cf275c8-mon-lwtxe04kpapd1i[124408]: debug 2022-05-16T04:31:17.617+0000 7 f35ada02700 1 heartbeat_map reset_timeout 'Monitor::cpu_tp thread 0x7f35ada02700' had timed out after 0.000000000s May 15 23:31:17 lwtxe04kpapd1i ceph-1f483d8e-8469-11ec-8e59-d0bf9cf275c8-mon-lwtxe04kpapd1i[124408]: debug 2022-05-16T04:31:17.617+0000 7 f35ad201700 1 heartbeat_map reset_timeout 'Monitor::cpu_tp thread 0x7f35ad201700' had timed out after 0.000000000s May 15 23:31:17 lwtxe04kpapd1i ceph-1f483d8e-8469-11ec-8e59-d0bf9cf275c8-mon-lwtxe04kpapd1i[124408]: debug 2022-05-16T04:31:17.647+0000 7 f35ae203700 1 heartbeat_map reset_timeout 'Monitor::cpu_tp thread 0x7f35ae203700' had timed out after 0.000000000s Note the timeout after 0.000000000s - also notice there were 23 pgs deep scrubbing at that time.