[Bug 1979885] Re: /etc.nfs.conf fails for nfsv4 server / blkmapd dumps core

[Andreas Hasenack]

Harald, you reported many different things, and I'm a bit lost here.
Let's pick one issue.

> After a nfs-server restart, rpc-svcgssd.service - RPC security service for NFS server isn’t 
> started again

Why isn't it running? What does status say?

About service restarts, with so many individual pieces it can get
complicated how to properly restart the service. I wrote this table in
the server guide [1], in the "Restarting NFS services" section.

> @Andreas Hasenack (ahasenack):
> the rpc_pipefs error is always present, nfs runs anyway

What do you mean? The rpc_pipefs is an absolute requirement, and there
are two mount units for it: var-lib-nfs-rpc_pipefs.mount and the
generated one which mounts it in /run when the nfs.conf has a path
different than the built-in default. One of the two mount units must
have been ran.


> nfsconf --dump # working system,

and

> # failing system /etc/nfs.conf

you used nfsconf --dump in one case, and straight /etc/nfs.conf in the
other, it's not clear if the failing system has some override in a
/etc/nfs.conf.d/*.conf snippet.


For blkmap, a core dump is definitely a bug, it should error clearly when it doesn't find the rpc_pipefs mountpoint instead of crashing, but fixing that looks like will just switch the error from a core dump to a "sorry, couldn't find rpc_pipefs", and it still won't run.


1. https://ubuntu.com/server/docs/service-nfs

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https://bugs.launchpad.net/bugs/1979885

Title:
  /etc.nfs.conf fails for nfsv4 server / blkmapd dumps core

Status in nfs-utils package in Ubuntu:
  Confirmed

Bug description:
  When using the 22.04 /etc/nfs.conf an nfsv4 server fails to operate

  It kind of works but some clients fail and try nfsv3 ports

  symptoms:

  on boot:
  × nfs-blkmap.service - pNFS block layout mapping daemon
       Loaded: loaded (/lib/systemd/system/nfs-blkmap.service; enabled; vendor preset: enabled)
       Active: failed (Result: core-dump) since Sat 2022-06-25 07:14:34 PDT; 27min ago
  journalctl --catalog --pager-end --unit=nfs-blkmap.service
  Jun 25 07:14:34 c68z blkmapd[2386154]: open pipe file /run/rpc_pipefs/nfs/blocklayout failed: No such file or directory

  on systemctl restart nfs-server.service:
  ○ rpc-svcgssd.service - RPC security service for NFS server
       Loaded: loaded (/lib/systemd/system/rpc-svcgssd.service; static)
       Active: inactive (dead) since Fri 2022-06-24 19:07:31 PDT; 12h ago

  after boot it was:
  ● rpc-svcgssd.service - RPC security service for NFS server                                                                 
       Loaded: loaded (/lib/systemd/system/rpc-svcgssd.service; static)                                                       
       Active: active (running) since Sat 2022-06-25 08:27:27 PDT; 2min 7s ago                                                

  Some clients tries to access port 111 which is not used by nfs4 on the
  network

  ProblemType: Bug
  DistroRelease: Ubuntu 22.04
  Package: linux-image-5.15.0-40-generic 5.15.0-40.43
  ProcVersionSignature: Ubuntu 5.15.0-40.43-generic 5.15.35
  Uname: Linux 5.15.0-40-generic x86_64
  NonfreeKernelModules: zfs zunicode zcommon znvpair zavl icp
  ApportVersion: 2.20.11-0ubuntu82.1
  Architecture: amd64
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', '/dev/snd/controlC0', '/dev/snd/hwC0D2', '/dev/snd/pcmC0D10p', '/dev/snd/pcmC0D9p', '/dev/snd/pcmC0D8p', '/dev/snd/pcmC0D7p', '/dev/snd/pcmC0D3p', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  CRDA: N/A
  CasperMD5CheckResult: unknown
  Date: Sat Jun 25 08:37:48 2022
  HibernationDevice: RESUME=none
  MachineType: Apple Inc. Macmini8,1
  ProcEnviron:
   SHELL=/bin/bash
   LANG=en_US.UTF-8
   TERM=screen
   PATH=(custom, no user)
  ProcFB: 0 i915drmfb
  ProcKernelCmdLine: root=ZFS=rpool/ROOT/ubuntu_mc4at7 ro initrd=EFI\hostname\initrd.img
  PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-5.15.0-40-generic N/A
   linux-backports-modules-5.15.0-40-generic  N/A
   linux-firmware                             20220329.git681281e4-0ubuntu3.2
  RfKill:
   0: hci0: Bluetooth
   	Soft blocked: no
   	Hard blocked: no
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/24/2022
  dmi.bios.release: 0.1
  dmi.bios.vendor: Apple Inc.
  dmi.bios.version: 1731.120.10.0.0 (iBridge: 19.16.15071.0.0,0)
  dmi.board.name: Mac-7BA5B2DFE22DDD8C
  dmi.board.vendor: Apple Inc.
  dmi.board.version: Macmini8,1
  dmi.chassis.type: 9
  dmi.chassis.vendor: Apple Inc.
  dmi.chassis.version: Mac-7BA5B2DFE22DDD8C
  dmi.modalias: dmi:bvnAppleInc.:bvr1731.120.10.0.0(iBridge19.16.15071.0.0,0):bd04/24/2022:br0.1:svnAppleInc.:pnMacmini8,1:pvr1.0:rvnAppleInc.:rnMac-7BA5B2DFE22DDD8C:rvrMacmini8,1:cvnAppleInc.:ct9:cvrMac-7BA5B2DFE22DDD8C:sku:
  dmi.product.family: Mac mini
  dmi.product.name: Macmini8,1
  dmi.product.version: 1.0
  dmi.sys.vendor: Apple Inc.

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