Cloud Core Router reboots with sha512 auth algorithm

What is the correct way to report bugs?

I have two CCR1036-8G-2S+ with following config:

/ip ipsec proposal
set [ find default=yes ] auth-algorithms=sha512
/ip ipsec peer
add address=10.20.0.1/32 dh-group=modp4096 enc-algorithm=aes-256 hash-algorithm=sha256 nat-traversal=no secret=123
/ip ipsec policy
set 0 disabled=yes
add dst-address=10.20.0.1/32 protocol=gre sa-dst-address=10.20.0.1 sa-src-address=10.20.0.2 src-address=10.20.0.2/32

One of the routers (the one which initiates ipsec connection) reboots while establishing ipsec

jan/02/1970 00:03:36 system,error,critical System rebooted because of kernel failure
jan/02/1970 00:03:36 system,error,critical router was rebooted without proper shutdown, probably kernel failure

Routeros version 6.26
Current Firmware 3.22

Forgot to mention that everything is OK, if I change algorithms to sha256 or sha1 or null