Following this post, I've some updates.
https://forum.proxmox.com/threads/proxmox-v6-servers-freeze-zvol-blocked-for-more-than-120s.57765/post-277073
System Information:
CPU: Xeon E3-1285L V3
RAM: 32GB DDR3-1600 ECC, 50GB swap partition(not on zfs) on the same SSD as rpool
HBA: LSI9305-24i...