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Bug 1753870 - Start nfs-blkmap.service without blocklayoutdriver warn as blkmapd: open pipe file /var/lib/nfs/rpc_pipefs/nfs/blocklayout failed: No such file or directory (RHEL8)
Summary: Start nfs-blkmap.service without blocklayoutdriver warn as blkmapd: open pipe...
Keywords:
Status: CLOSED WONTFIX
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: nfs-utils
Version: 8.0
Hardware: All
OS: Linux
medium
low
Target Milestone: rc
: ---
Assignee: Alice Mitchell
QA Contact: Yongcheng Yang
URL:
Whiteboard:
Depends On: 1753865
Blocks:
TreeView+ depends on / blocked
 
Reported: 2019-09-20 06:11 UTC by Yongcheng Yang
Modified: 2021-03-20 07:30 UTC (History)
3 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of: 1753865
Environment:
Last Closed: 2021-03-20 07:30:45 UTC
Type: Bug
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)

Description Yongcheng Yang 2019-09-20 06:11:54 UTC 
This also exists in RHEL8.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[22:36:57 root@ ~~]# lsmod | grep blocklayoutdriver
[22:36:57 root@ ~~]# service nfs-blkmap restart
Redirecting to /bin/systemctl restart nfs-blkmap.service
[22:36:57 root@ ~~]# service nfs-blkmap status
Redirecting to /bin/systemctl status nfs-blkmap.service
* nfs-blkmap.service - pNFS block layout mapping daemon
   Loaded: loaded (/usr/lib/systemd/system/nfs-blkmap.service; disabled; vendor preset: disabled)
   Active: active (running) since Wed 2019-09-04 22:36:57 EDT; 50ms ago
  Process: 7461 ExecStart=/usr/sbin/blkmapd (code=exited, status=0/SUCCESS)
 Main PID: 7462 (blkmapd)
    Tasks: 1 (limit: 26213)
   Memory: 1.0M
   CGroup: /system.slice/nfs-blkmap.service
           `-7462 /usr/sbin/blkmapd

Sep 04 22:36:57 rhel-8.1.0.redhat.com systemd[1]: Starting pNFS block layout mapping daemon...
Sep 04 22:36:57 rhel-8.1.0.redhat.com blkmapd[7462]: open pipe file /var/lib/nfs/rpc_pipefs/nfs/blocklayout failed: No such file or directory     <<<<<<<<
Sep 04 22:36:57 rhel-8.1.0.redhat.com systemd[1]: Started pNFS block layout mapping daemon.

P.S.
This warning only occurs when module "blocklayoutdriver" not loaded.

However, even after loading the module, there might be another warning, i.e.
Bug 1753828 - [blkmapd] systemd: Can't open PID file /var/run/blkmapd.pid (yet?) after start: No such file or directory (RHEL8)


+++ This bug was initially created as a clone of Bug #1753865 +++

Description of problem:
As rhel7 Bug 1563319 says, the NFS client should be able to automatically load module "blocklayoutdriver".
But seems there is always a blkmapd warning after starting nfs-blkmap.service:
"""
blkmapd[43744]: open pipe file /var/lib/nfs/rpc_pipefs/nfs/blocklayout failed: No such file or directory
"""

However, it doesn't affect the following function.

I'm not sure whether this is a real bug. But in the future may receive some complain as more customers using this scenario.


Version-Release number of selected component (if applicable):
nfs-utils-1.3.0-0.65.el7

How reproducible:
always

Steps to Reproduce:
1. modprobe -r blocklayoutdriver
2. systemctl restart nfs-blkmap.service
3. systemctl status nfs-blkmap.service
Comment 1 Steve Whitehouse 2020-03-13 09:44:12 UTC 
Here is the other bug of the pair relating to the blocklayout driver.
Comment 5 Yongcheng Yang 2020-10-26 08:21:10 UTC 
(In reply to Yongcheng Yang from comment #0)
> ...
> 
> Steps to Reproduce:
> 1. modprobe -r blocklayoutdriver
> 2. systemctl restart nfs-blkmap.service
> 3. systemctl status nfs-blkmap.service

Looks like the blocklayoutdriver is not loaded automatically even though the nfs-blkmap server has been bring up.

There's some inconsistency between the module and service config IMO.

[root@hp-dl385pg8-09 ~]# rpm -q nfs-utils
nfs-utils-2.3.3-35.el8.x86_64
[root@hp-dl385pg8-09 ~]# lsmod | grep blocklayoutdriver
[root@hp-dl385pg8-09 ~]# systemctl restart nfs-blkmap && systemctl status nfs-blkmap.service
● nfs-blkmap.service - pNFS block layout mapping daemon
   Loaded: loaded (/usr/lib/systemd/system/nfs-blkmap.service; disabled; vendor preset: disabled)
   Active: active (running) (thawing) since Mon 2020-10-26 04:17:05 EDT; 100ms ago
  Process: 28742 ExecStart=/usr/sbin/blkmapd (code=exited, status=0/SUCCESS)
 Main PID: 28744 (blkmapd)
    Tasks: 1 (limit: 204052)
   Memory: 1.4M
   CGroup: /system.slice/nfs-blkmap.service
           └─28744 /usr/sbin/blkmapd

Oct 26 04:17:05 hp-dl385pg8-09.rhts.eng.pek2.redhat.com systemd[1]: Starting pNFS block layout mapping daemon...
Oct 26 04:17:05 hp-dl385pg8-09.rhts.eng.pek2.redhat.com blkmapd[28744]: open pipe file /var/lib/nfs/rpc_pipefs/nfs/blocklayout failed: No su>
Oct 26 04:17:05 hp-dl385pg8-09.rhts.eng.pek2.redhat.com systemd[1]: Started pNFS block layout mapping daemon.
[root@hp-dl385pg8-09 ~]# cat /var/run/blkmapd.pid
28744
[root@hp-dl385pg8-09 ~]# ps 28744
    PID TTY      STAT   TIME COMMAND
  28744 ?        Ss     0:00 /usr/sbin/blkmapd
[root@hp-dl385pg8-09 ~]# lsmod | grep blocklayoutdriver
[root@hp-dl385pg8-09 ~]#                <<<<<<<<<<<<<<<
Comment 7 RHEL Program Management 2021-03-20 07:30:45 UTC 
After evaluating this issue, there are no plans to address it further or fix it in an upcoming release.  Therefore, it is being closed.  If plans change such that this issue will be fixed in an upcoming release, then the bug can be reopened.
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