frequent crashes / restarts with unbound 1.9.0

[Georg Gottleuber]

Some additional information:

/var/log/unbound.log showing a crash / restart ----------------------
...
[1598473907] unbound[32484:3] notice: ssl handshake failed IP port 35524
[1598473908] unbound[32484:3] error: ssl handshake failed crypto
error:14094412:SSL routines:ssl3_read_bytes:sslv3 alert bad certificate
[1598473908] unbound[32484:3] notice: ssl handshake failed IP port 35536
[1598473908] unbound[32484:3] error: ssl handshake failed crypto
error:14094412:SSL routines:ssl3_read_bytes:sslv3 alert bad certificate
[1598473908] unbound[32484:3] notice: ssl handshake failed IP port 35546
[1598473909] unbound[4285:0] notice: init module 0: subnet
[1598473909] unbound[4285:0] notice: init module 1: validator
[1598473909] unbound[4285:0] notice: init module 2: iterator
[1598473909] unbound[4285:0] info: start of service (unbound 1.9.0).
[1598473910] unbound[4285:0] info: generate keytag query _ta-4f66. NULL IN
[1598473910] unbound[4285:3] info: generate keytag query _ta-4f66. NULL IN
[1598473910] unbound[4285:2] info: generate keytag query _ta-4f66. NULL IN
[1598473910] unbound[4285:1] info: generate keytag query _ta-4f66. NULL IN
[1598473910] unbound[4285:3] error: ssl handshake failed crypto
error:14094412:SSL routines:ssl3_read_bytes:sslv3 alert bad certificate
[1598473910] unbound[4285:3] notice: ssl handshake failed IP port 35566
[1598473916] unbound[4285:2] error: ssl handshake failed crypto
error:14094412:SSL routines:ssl3_read_bytes:sslv3 alert bad certificate
[1598473916] unbound[4285:2] notice: ssl handshake failed IP port 35670
...

-------------------------------------------------------------------
SSL-Errors are spread across the whole file and in no correlation to
crash / restart.


/var/log/syslog may be more interesting ---------------------------
[trimmed date and hour]
28:13 package-helper[24457]: /var/lib/unbound/root.key has content
35:36 unbound[24461]: [err] evmap.c:381: Assertion nread >= 0 failed in
evmap_io_del_
35:36 systemd[1]: unbound.service: Main process exited, code=killed,
status=6/ABRT
35:36 systemd[1]: unbound.service: Failed with result 'signal'.
35:37 systemd[1]: unbound.service: Service RestartSec=100ms expired,
scheduling restart.
35:37 systemd[1]: unbound.service: Scheduled restart job, restart
counter is at 125.
35:37 package-helper[25882]: /var/lib/unbound/root.key has content
46:19 unbound[25886]: [err] evmap.c:381: Assertion nread >= 0 failed in
evmap_io_del_
46:19 systemd[1]: unbound.service: Main process exited, code=killed,
status=6/ABRT
46:19 systemd[1]: unbound.service: Failed with result 'signal'.
46:19 systemd[1]: unbound.service: Service RestartSec=100ms expired,
scheduling restart.
46:19 systemd[1]: unbound.service: Scheduled restart job, restart
counter is at 126.
...
-------------------------------------------------------------------

Regards,
Georg