skiboot 6.0.22 was released on Friday March 27th, 2020. It replaces skiboot-6.0.21 as the current stable release in the 6.0.x series.
It is recommended that 6.0.22 be used instead of any previous 6.0.x version due to the bug fixes it contains.
Bug fixes included in this release are:
errorlog: Increase the severity of abnormal reboot events
eSEL: Make sure PANIC logs are sent to BMC before calling assert
core/ipmi: Fix use-after-free
ipmi: ensure forward progress on ipmi_queue_msg_sync()