Skip to main content
NetApp Knowledge Base

Node in boot loop with partner up but not serving data

Last Updated:

Applies to

  • Two node switchless AFF or FAS configuration


  • Node panics while in takeover of partner, and enters boot loop:
PANIC : prod/common/wafl/blkr/blkr.c:542: Assertion failure.
  • Further boot attempts result in:
PANIC : page fault (supervisor read data, page not present) on VA 0x410 cs:rip 0x20:0xffffffff8067192a rflags 0x10246
  • Node is unable to boot to maintenance mode or boot menu without panicking
  • This can occur during any takeover - including during ONTAP upgrade
  • Node panics just after printing a message similar to the following:
Warning: Freeing unused FAT sector 1663140 4 6c


Sign in to view the entire content of this KB article.

New to NetApp?

Learn more about our award-winning Support

NetApp provides no representations or warranties regarding the accuracy or reliability or serviceability of any information or recommendations provided in this publication or with respect to any results that may be obtained by the use of the information or observance of any recommendations provided herein. The information in this document is distributed AS IS and the use of this information or the implementation of any recommendations or techniques herein is a customer's responsibility and depends on the customer's ability to evaluate and integrate them into the customer's operational environment. This document and the information contained herein may be used solely in connection with the NetApp products discussed in this document.