由于 Panic，ONTAP 升级停滞：进程 nodewatchdog 中的关机时间超过 930 秒
适用于
- ONTAP 9
- Service Processor (SP) 或 baseboard management controller (BMC)
问题
- 节点死机，ONTAP 升级期间无法启动。
- 报告了 sk.panic 事件消息：
[Node-A: nodewatchdog: nodewatchdog.node.longreboot:alert]: Data ONTAP has experienced a serious internal error. The node experiencing this problem is unable to reboot within it's allotted time of 930 seconds causing it to be unavailable. The node has been panicked to enable it to recover.
[Node-A: nodewatchdog: sk.panic:alert]: Panic String: Shutdown taking longer than 930 seconds in process nodewatchdog on release 9.5P12 (C)
[Node-A: nodewatchdog: coredump.shutdown.trace:notice]: coredump shutdown times: kmod dumper start 208, panic_info set 52, sf_dumpcore sent 0, sparecore id sent 0, fmot_outage info sent 0, disk_dump_start done 5113, coredump begin 29 (all in msec).