#zfs broken in some way?

I have tons of log entries like this:

Oct 31 19:28:08 big zed: eid=15864 class=deadman pool_guid=0x991AE6C426BAAFF3 vdev_path=/dev/sda3


zpool events -v shows
```
Oct 31 2021 19:27:47.493220230 ereport.fs.zfs.deadman
class = "ereport.fs.zfs.deadman"
ena = 0x5e4f3bd362701c01
detector = (embedded nvlist)
version = 0x0
scheme = "zfs"
pool = 0x991ae6c426baaff3
vdev = 0x641a3dd75d0d866b
(end detector)
pool = "zroot"
pool_guid = 0x991ae6c426baaff3
pool_state = 0x0
pool_context = 0x0
pool_failmode = "wait"
vdev_guid = 0x641a3dd75d0d866b
vdev_type = "disk"
vdev_path = "/dev/sda3"
vdev_ashift = 0x9
vdev_complete_ts = 0x60180fb35d6
vdev_delta_ts = 0x9d02cd062
vdev_read_errors = 0x0
vdev_write_errors = 0x0
vdev_cksum_errors = 0x0
vdev_delays = 0x0
parent_guid = 0x991ae6c426baaff3
parent_type = "root"
vdev_spare_paths =
vdev_spare_guids =
zio_err = 0x0
zio_flags = 0x184880
zio_stage = 0x100000
zio_pipeline = 0x1700000
zio_delay = 0x0
zio_timestamp = 0x5e0408867d9
zio_delta = 0x0
zio_offset = 0x10557a1d400
zio_size = 0x1800
zio_objset = 0x3c
zio_object = 0x0
zio_level = 0x1
zio_blkid = 0xc
time = 0x617ee023 0x1d65f186
eid = 0x3e15

Any hints? All datasets are visible.