blkmapd: open pipe file /run/rpc_pipefs/nfs/blocklayout failed: No such file or directory

[pfg]

for a long time I have seen such an error in the boot log

Dec 07 21:00:07 homl blkmapd[267]: open pipe file /run/rpc_pipefs/nfs/blocklayout failed: No such file or directory

while the NFS works without problems
recently found a solution to this error
https://bugzilla.redhat.com/show_bug.cgi?id=1753870

add kernel module pre-load to the unit

# /etc/systemd/system/nfs-blkmap.service.d/override.conf
[Service]
ExecStartPre=/usr/sbin/modprobe blocklayoutdriver

and the next time the system boots this error did not appear

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Davide Aguiari (gorghino)]

I have this error on my Pop_OS! too.

gorgo@pop-os
------------
OS: Pop!_OS 20.10 x86_64
Host: Blade 15 Advanced Model (Early 2020) - RZ09-033 5.04
Kernel: 5.11.0-7612-generic
Uptime: 15 mins
Packages: 3056 (dpkg), 30 (flatpak)
Shell: bash 5.0.17
Resolution: 2560x1440
DE: GNOME 3.38.3
WM: Mutter
WM Theme: Pop
Theme: Pop-dark [GTK2/3]
Icons: Pop [GTK2/3]
Terminal: gnome-terminal
CPU: Intel i7-10875H (16) @ 2.300GHz
GPU: Intel UHD Graphics
Memory: 2607MiB / 15863MiB

[Davide Aguiari (gorghino)]

nfs-common 1:1.3.4-2.5ubuntu6

[Thomas Debesse (illwieckz)]

I reproduce on Ubuntu 22.04.1 LTS, I can workaround the problem this way:

modprobe blocklayoutdriver && systemctl restart nfs-blkmap.service

Here is the NFS package version:

nfs-kernel-server 1:2.6.1-1ubuntu1

Edit: in fact not this doesn't workaround the problem.

[Thomas Debesse (illwieckz)]

In fact the modprobe only workarounds one problem, the service is still failing.

Before `modprobe blocklayoutdriver`, I got that:

```
Starting pNFS block layout mapping daemon...
open pipe file /run/rpc_pipefs/nfs/blocklayout failed: No such file or directory
Started pNFS block layout mapping daemon.
nfs-blkmap.service: Main process exited, code=killed, status=6/ABRT
nfs-blkmap.service: Failed with result 'signal'.
```

After, I get that:

```
Starting pNFS block layout mapping daemon...
nfs-blkmap.service: Can't open PID file /run/blkmapd.pid (yet?) after start: Operation not permitted
Started pNFS block layout mapping daemon.
nfs-blkmap.service: Main process exited, code=killed, status=6/ABRT
nfs-blkmap.service: Failed with result 'protocol'.
```

[Heinrich Schuchardt (xypron)]

@pfg21rus

You suggested to add
ExecStartPre=/usr/bin/modprobe blocklayoutdriver
to systemd/nfs-blkmap.service

I suggest that you send a patch to <email address hidden> and attach the link for your patch in https://lore.kernel.org/linux-nfs to this bug report.