750G crashes with RouterOS 5.20

Hello,

After upgrade from 5.16 to 5.20 my 750G started random crashing, logging something like
system error critical router was rebooted without proper shutdown by watchdog timer
It running 1 PPPoE server, 2 bgp sessions, 3 ospf areas.
On 5.16 version its uptime was 3-4 months without any problems.

How can I backtrace this crashes and find the way to solve this problem ?

I have similar issues with RB951 and 5.20/2.41. The gaps in the attached ping chart show when the watchdog restarts happened. I have downgraded to 5.19/2.39 and will report back after a while.
freeze.png

Thanks for your reply. Our users cannot wait, so I changed hardware to RB800/5.20/1.39.
It seems that on powerpc platform this problem doesn’t exist.

Balu75,

I reverted back to 5.19 but then I noticed that my CPU frequency dropped to an incorrect value of 175mhz - this caused similar lock ups like before. After a config reset CPU frequency returned to 300mhz (default) and the device runs without issues on 5.19 since then.

I will not load 5.20 on any 700 or 900 router because I feel the release is too resource intensive.