Command: mdadm --manage /dev/md/cdr --re-add /dev/sdb3
After that:

kernel: [6820774.725261] md: md125 stopped.
kernel: [6820774.725269] md: unbind<sdb3>
kernel: [6820774.754364] md: export_rdev(sdb3)
kernel: [6820774.754554] md125: detected capacity change from 60011573248 to 0
kernel: [6820788.758564] md: bind<sdb3>
kernel: [6820788.999970] RAID1 conf printout:
kernel: [6820788.999973]  --- wd:1 rd:2
kernel: [6820788.999976]  disk 0, wo:0, o:1, dev:sda3
kernel: [6820788.999978]  disk 1, wo:1, o:1, dev:sdb3
kernel: [6820789.000014] md: recovery of RAID array md122
kernel: [6820789.000019] md: minimum _guaranteed_  speed: 1000 KB/sec/disk.
kernel: [6820789.000022] md: using maximum available idle IO bandwidth (but not more than 200000 KB/sec) for recovery.
kernel: [6820789.000027] md: using 128k window, over a total of 58605052 blocks.
kernel: [6820789.000188] md: md122: recovery done.
kernel: [6820789.050011] RAID1 conf printout:
kernel: [6820789.050013]  --- wd:2 rd:2
kernel: [6820789.050016]  disk 0, wo:0, o:1, dev:sda3
kernel: [6820789.050024]  disk 1, wo:0, o:1, dev:sdb3
kernel: [6821213.679490] xfs_iunlink_remove: xfs_itobp()  returned anerror 117 on md122.  Returning error.
kernel: [6821213.679493] xfs_inactive:^Ixfs_ifree() returned an error = 117 on md122
kernel: [6821213.679497] xfs_force_shutdown(md122,0x1) called from line 1319 of file fs/xfs/xfs_vnodeops.c.  Return address = 0xc115fddd
kernel: [6821213.733125] Filesystem "md122": xfs_log_force: error 5 returned.
kernel: [6821213.747354] Filesystem "md122": I/O Error Detected.  Shutting down filesystem: md122
kernel: [6821213.747442] Please umount the filesystem, and rectify the problem(s)
kernel: [6821240.856340] Filesystem "md122": xfs_log_force: error 5 returned.
kernel: [6821270.858368] Filesystem "md122": xfs_log_force: error 5 returned.
kernel: [6821300.860374] Filesystem "md122": xfs_log_force: error 5 returned.
kernel: [6821330.862691] Filesystem "md122": xfs_log_force: error 5 returned.
kernel: [6821360.864504] Filesystem "md122": xfs_log_force: error 5 returned.