You are not alone ...
1. I have exact the same problem on a fresh installation while I copy files to the FreeNAS (with FreeSync):
Rechnername freenas.local
Version FreeNAS-9.1.0-RELEASE-x64 (dff7d13)
Plattform AMD Athlon(tm) 64 X2 Dual Core Processor 4800+
Speicher 1772MB
2. There are other messages like kernel: nfe0: tx v2 error 0x6204<UNDERFLOW>
What can we do to solve this problem?
Sep 14 11:55:28 freenas smbd[2959]: unknown tag type 64
Sep 14 11:55:28 freenas smbd[2959]: [2013/09/14 11:55:28.727666, 0] modules/vfs_posixacl.c:170(smb_ace_to_internal)
Sep 14 11:55:28 freenas smbd[2959]: unknown tag type 64
Sep 14 11:55:28 freenas smbd[2959]: [2013/09/14 11:55:28.824583, 0] modules/vfs_posixacl.c:170(smb_ace_to_internal)
Sep 14 11:55:28 freenas smbd[2959]: unknown tag type 64
Sep 14 11:55:28 freenas smbd[2959]: [2013/09/14 11:55:28.929213, 0] modules/vfs_posixacl.c:170(smb_ace_to_internal)
Sep 14 11:55:28 freenas smbd[2959]: unknown tag type 64
Sep 14 11:55:29 freenas smbd[2959]: [2013/09/14 11:55:29.034914, 0] modules/vfs_posixacl.c:170(smb_ace_to_internal)
Sep 14 11:55:29 freenas kernel: nfe0: tx v2 error 0x6204<UNDERFLOW>
Sep 14 11:55:29 freenas smbd[2959]: unknown tag type 64
Sep 14 11:55:29 freenas smbd[2959]: [2013/09/14 11:55:29.081535, 0] modules/vfs_posixacl.c:170(smb_ace_to_internal)
Sep 14 11:55:29 freenas smbd[2959]: unknown tag type 64
Sep 14 11:55:29 freenas smbd[2959]: [2013/09/14 11:55:29.119131, 0] modules/vfs_posixacl.c:170(smb_ace_to_internal)
Sep 14 11:55:29 freenas smbd[2959]: unknown tag type 64
Sep 14 11:55:29 freenas smbd[2959]: [2013/09/14 11:55:29.438338, 0] modules/vfs_posixacl.c:170(smb_ace_to_internal)
Sep 14 11:55:29 freenas smbd[2959]: unknown tag type 64
Sep 14 11:55:29 freenas kernel: nfe0: tx v2 error 0x6204<UNDERFLOW>
Sep 14 11:55:29 freenas last message repeated 3 times
Sep 14 11:55:30 freenas smbd[2959]: [2013/09/14 11:55:30.222925, 0] modules/vfs_posixacl.c:170(smb_ace_to_internal)
Sep 14 11:55:30 freenas smbd[2959]: unknown tag type 64
Sep 14 11:55:30 freenas kernel: nfe0: tx v2 error 0x6204<UNDERFLOW>
Sep 14 11:55:45 freenas last message repeated 356 times
Sep 14 11:55:46 freenas smbd[2959]: [2013/09/14 11:55:46.222565, 0] modules/vfs_posixacl.c:170(smb_ace_to_internal)
Sep 14 11:55:46 freenas smbd[2959]: unknown tag type 64
Greetings
-merlinuwe