Unable to write large files bigger than 2GB on encrypted NFS4 filesystem

Solution In Progress - Updated -

Environment

  • Red Hat Enterprise Linux 5.11
  • NFSv4 mounted share
  • 3rd party safenetfs service running with module version 8.2.1.000-009

Issue

  • Whenever user tries to write file bigger than 2Gb to an encrypted NFS4 partition, write fails with error message:
[user@hostname enc_share]$ date; dd if=/dev/zero of=largefile bs=1024 count=3000000; date
Sun Feb 28 16:07:52 PST 2016
File size limit exceeded                               <<==========  ERROR

Resolution

  • Safenet has confirmed this issue to be related to a bug in their ProtectFile product. Fix is not yet available.

Root Cause

  • Bug in 3rd party product

Diagnostic Steps

  • Encryption is provided by 3rd party module safenetfs.ko
$ cat sos_commands/kernel/modinfo_iptable_filter_ip_tables_x_tables_vsock_vmci_vmmemctl_tw |grep safenetfs -A1 -B1
license:        Proprietary
depends:        safenetfs
vermagic:       2.6.18-406.el5 SMP mod_unload gcc-4.1
filename:       /lib/modules/2.6.18-406.el5/kernel/fs/safenetpf/safenetfs.ko
version:        8.2.1.000-009
  • with stopped safenetfs service there is no issue seen

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