System hangs while coming down...

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I have 2 Oracle boxes that stall out while coming down for a reboot. Both are running RHEL 6.8 on IBM x3690 servers. This is the error from the messages log...

kernel: ------------[ cut here ]------------
Jun 20 00:04:10 kernel: WARNING: at fs/namespace.c:679 mntput_no_expire+0x109/0x110() (Tainted: P -- ------------ )
Jun 20 00:04:10 kernel: Hardware name: System x3690 X5 -[7147AC1]-
Jun 20 00:04:10 rhedcls104 kernel: Modules linked in: oracleacfs(P)(U) oracleadvm(P)(U) oracleoks(P)(U) lshook(U) oracleasm nfs lockd fscache auth_rpcgss nfs_acl bnx2fc cnic uio fcoe libfcoe libfc 8021q garp stp llc sunrpc cpufreq_ondemand acpi_cpufreq freq_table mperf bonding ipv6 nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack iptable_filter ip_tables vfat fat dm_round_robin dm_multipath vhost_net macvtap macvlan tun kvm_intel kvm microcode iTCO_wdt iTCO_vendor_support ipmi_devintf joydev cdc_ether usbnet mii serio_raw i2c_i801 i2c_core lpc_ich mfd_core shpchp bnx2 ioatdma dca i7core_edac edac_core ipmi_si ipmi_msghandler sg ext4 jbd2 mbcache sr_mod cdrom sd_mod pata_acpi ata_generic ata_piix be2net lpfc scsi_transport_fc scsi_tgt crc_t10dif megaraid_sas wmi dm_mirror dm_region_hash dm_log dm_mod [last unloaded: linuxshield]
Jun 20 00:04:10 kernel: Pid: 25093, comm: umount.nfs Tainted: P -- ------------ 2.6.32-696.3.1.el6.x86_64 #1
Jun 20 00:04:10 kernel: Call Trace:
Jun 20 00:04:10 kernel: [] ? warn_slowpath_common+0x91/0xe0
Jun 20 00:04:10 kernel: [] ? warn_slowpath_null+0x1a/0x20
Jun 20 00:04:10 kernel: [] ? mntput_no_expire+0x109/0x110
Jun 20 00:04:10 kernel: [] ? sys_umount+0x7b/0x3a0
Jun 20 00:04:10 kernel: [] ? system_call_fastpath+0x16/0x1b
Jun 20 00:04:10 kernel: ---[ end trace 59f348172cdfec6d ]---

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