Reboot hangs when NFS share is mounted and lost connection to NFS server during I/O operation in Red Hat Enterprise Linux.

Solution In Progress - Updated -

Issue

  • Reboot hangs when NFS share is mounted and lost connection to NFS server during I/O operation.
  • Mostly seen nfs disconnection log.
nfs: server 1.1.1.1 not responding, still trying

Unmounting NFS filesystems: umount.nfs: : device is busy
umount.nfs: : device is busy
[FAILED]
Unmounting NFS filesystems (retry): [ OK ]
~~~
The issue occurs if the mount option is hard mount

Environment

  • Red Hat Enterprise Linux 8
    • All kernels believed to be affected
  • Red Hat Enterprise Linux 7
    • All kernels believed to be affected
    • Seen on kernels 3.10.0-957.el7 and prior
  • Red Hat Enterprise Linux 6
    • All kernels believed to be affected
  • NFS mount point
    • 'hard' mount option
    • NFS IO in progress
    • Network partition (can be simulated with firewalld port block on NFS server)
    • 'reboot'

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