- Annoyance
I'm seeing server crashes roughly once a day after going from 6.12.4 to 6.12.6. My symptoms are exactly the same as in this bug report:
I can ping the machine and the console is responsive, but when I try to log in it just freezes after I enter the username. I get "504 Gateway Time-out" nginx errors on the web interface, and none of the dockers are responsive. Diagnostics attached.
As far as I can tell I don't have realtek or adaptec hardware. My docker is running ipvlan, not macvlan (it was set to that in 6.12.4 already, and was working fine). (Edit to add: I don't have any VMs running, unlike in the above bug report, and "Fix common problems" doesn't show anything except a warning about syslog being mirrored to flash.)
I set syslog to mirror to a cache directory, but I don't see any logs there. I've just checked the box to get it to mirror to flash, so if it happens again hopefully I'll have something useful (but I haven't see anything relevant in the logs I've looked at in the past, it just looks as if the server is working normally).
I have some other very odd and vexing behavior which started happening at the time I upgraded, too, but it's all at the BIOS level, so it kind of seems impossible that the upgrade would have caused it. The first time the server went down, after I restarted the BIOS wouldn't recognize my flash drive as a bootable device (it just didn't appear in the menus at all). The drive was attached to an internal USB header. Eventually I reinstalled from an online backup onto a new thumb drive, re-registered it (blacklisting the old drive), and was able to boot from it.
Things were working fine, but when the server went down again and I had to cold-restart it, the new thumb drive wasn't available as a bootable device. Through trial and error, and an eventual CMOS reset, I discovered that after rebooting the server I need to physically unplug the USB drive and plug it back in in order for it to be recognized and bootable. I have no idea what that's about. It's happening before the OS loads, so it doesn't seem possible that Unraid could be affecting it. I did verify that I'm running the latest firmware for my motherboard (an ASRock z170 Extreme 7+). I haven't seen this behavior before but I also have rarely needed to cold-boot my server in the past.
At this point I'd like to roll back to Unraid 6.12.4, since it didn't have these issues, but since I'm on a new USB stick, I don't have the option to just roll back to it from Tools / Update OS. Are there files I can copy from the old USB stick to the new one that will let me do that? Or is there some other way to downgrade?