PVE5 suddenly reboots

[Alessandro 123]

I'm using PVE5 on a backup server (no VM at all, i'm using PVE on this server only for ZFS)

I've disabled hardware watchdog, swappiness is set to 10, server has 16GB available and ZFS is set with primarycache=metadata

Anyway, this server every couple of days, suddenly reboots, no messages are wrote on syslog/messagelog/kern.log

Any software watchdog enabled in PVE ? What else should I check ?
AFAIK, even with low memory, Linux should not reboot. OOM killer should start and start to kill everything, but without a reboot.

It's the first time that a server of mine is automatically rebooting. usually, when reboot on panic is set, a reboot is made after a kernel panic, but a kernel panic is wrote on log.

Any hint?

 

[dcsapak]

Any software watchdog enabled in PVE ? What else should I check ?

if you have ha activated, the kernel software watchdog gets enabled

It's the first time that a server of mine is automatically rebooting. usually, when reboot on panic is set, a reboot is made after a kernel panic, but a kernel panic is wrote on log.

you could install systemd-coredump
the systemctl daemon-reload

and after a crash list the dumps with
coredumpctl list

 

[Alessandro 123]

How can I look for software watchdog?
I've looked at running modules and I haven't find anything related but I can be wrong

Coredump already enabled and no core created

 

[dcsapak]

do you have a ha enabled guest? if yes, the software watchdog will run

 

[Alessandro 123]

I don't have any VM running in this server.
I'm using Proxmox only for native ZFS support, i don't do any kind of virtualization here.