NFSv4 client in FIPS mode (fips=1 on kernel command line) kerberos mount causes kernel panic in gss_pipe_downcall - kernel BUG at net/sunrpc/auth_gss/auth_gss.c:699!

Solution In Progress - Updated -

Issue

  • NFSv4 Mount with krb5 causes kernel panic
  • mounting with sec=krb5{,i,p} causes kernel panic in fips mode if the gss context received by the client uses md5

Environment

  • Red Hat Enterprise Linux 6 or 7
  • Secure (kerberized) NFS configured
  • EMC Isilon NFS server running OneFS 7.x (but can also be reproduced using a Linux NFS server that has aes256-cts-hmac-sha1-96 and aes128-cts-hmac-sha1-96 disabled)
  • Client running in FIPS mode (i.e. fips=1 is in the kernel command line)
  • Seen with Microsoft Active Directory (AD) Key Distribution Center (KDC)

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