[Bug 2060217] Comment bridged from LTC Bugzilla

[bugproxy]

------- Comment From vasily.gorbik at de.ibm.com 2024-04-10 11:16 EDT-------
bisected it to commit fce7913b13d0 ("NFSD: Use a bitmask loop to encode FATTR4 results")
Looks like an unfixed endianness issue since v6.7.

commit fce7913b13d0270bcf926f986b7ef329e2e56eec
Author: Chuck Lever <chuck.lever at oracle.com>
Date:   Mon Sep 18 10:02:12 2023 -0400

NFSD: Use a bitmask loop to encode FATTR4 results
The fattr4 encoder is now structured like the COMPOUND op encoder:
one function for each individual attribute, called by bit number.
Benefits include:
- The individual attributes are now guaranteed to be encoded in
bitmask order into the send buffer

- There can be no unwanted side effects between attribute encoders

- The code now clearly documents which attributes are /not/
implemented on this server

Reviewed-by: Jeff Layton <jlayton at kernel.org>
Signed-off-by: Chuck Lever <chuck.lever at oracle.com>

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https://bugs.launchpad.net/bugs/2060217

Title:
  NFSv4 fails to mount in noble/s390x

Status in Ubuntu on IBM z Systems:
  New
Status in linux package in Ubuntu:
  New
Status in nfs-utils package in Ubuntu:
  Triaged

Bug description:
  https://autopkgtest.ubuntu.com/packages/n/nfs-utils/noble/s390x

  Looks like it has been failing for a long time already.

  Log: https://autopkgtest.ubuntu.com/results/autopkgtest-
  noble/noble/s390x/n/nfs-utils/20240404_145924_ef255@/log.gz

  339s autopkgtest [14:41:04]: test local-server-client: [-----------------------
  340s Killed
  340s autopkgtest [14:41:05]: test process requested reboot with marker boot1
  364s autopkgtest-virt-ssh: WARNING: ssh connection failed. Retrying in 3 seconds...
  372s FAIL: nfs_home not mounted
  373s autopkgtest [14:41:38]: test local-server-client: -----------------------]
  373s local-server-client  FAIL non-zero exit status 1

  and

  934s autopkgtest [14:50:59]: test kerberos-mount: [-----------------------
  935s Initializing database '/var/lib/krb5kdc/principal' for realm 'DEP8',
  935s master key name 'K/M at DEP8'
  935s Authenticating as principal root/admin at DEP8 with password.
  935s Principal "nfs/nfs-server.dep8 at DEP8" created.
  935s Authenticating as principal root/admin at DEP8 with password.
  935s Entry for principal nfs/nfs-server.dep8 with kvno 2, encryption type aes256-cts-hmac-sha1-96 added to keytab FILE:/etc/krb5.keytab.
  935s Entry for principal nfs/nfs-server.dep8 with kvno 2, encryption type aes128-cts-hmac-sha1-96 added to keytab FILE:/etc/krb5.keytab.
  935s Authenticating as principal root/admin at DEP8 with password.
  935s Principal "host/nfs-server.dep8 at DEP8" created.
  935s Authenticating as principal root/admin at DEP8 with password.
  935s Entry for principal host/nfs-server.dep8 with kvno 2, encryption type aes256-cts-hmac-sha1-96 added to keytab FILE:/etc/krb5.keytab.
  935s Entry for principal host/nfs-server.dep8 with kvno 2, encryption type aes128-cts-hmac-sha1-96 added to keytab FILE:/etc/krb5.keytab.
  936s exporting *:/storage
  938s mount.nfs: mount system call failed for /mnt
  938s umount: /mnt: not mounted.
  938s autopkgtest [14:51:02]: test kerberos-mount: -----------------------]
  939s kerberos-mount       FAIL non-zero exit status 32

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