This is the same as what I am getting. However, it is only with a samba 4 
machine on CentOS 7. My other samba 3 systems are working just fine. To make 
my issues worse, yesterday I setup a new CentOS 7 machine and I cannot access 
any of it's samba shares.... not in Ubuntu or in Windows!
In windows it says: The security ID structure is invalid.

Which makes me think it's an error similar to what we are seeing in this 
kernel when it says: send length mismatch.

Maybe this is a samba 4 issue? Just my thoughts.

Nathan





On Thursday, October 09, 2014 11:14:00 you wrote:
> Couldn't mount with 3.13.0-37.
> 
> [  175.290273] ------------[ cut here ]------------
> [  175.290298] WARNING: CPU: 0 PID: 6468 at
> /build/buildd/linux-3.13.0/fs/cifs/transport.c:313
> smb_send_rqst+0x215/0x270 [cifs]() [  175.290301] Send length
> mismatch(send_length=72 smb_buf_length=2164260932) [  175.290302] Modules
> linked in: btrfs raid6_pq xor ufs qnx4 hfsplus hfs minix ntfs msdos jfs xfs
> libcrc32c snd_hda_codec_hdmi joydev hid_generic hid_ezkey usbhid hid
> snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep snd_pcm
> snd_page_alloc snd_seq_midi snd_seq_midi_event snd_rawmidi nouveau mxm_wmi
> video bnep rfcomm uvcvideo kvm_amd videobuf2_vmalloc bluetooth
> videobuf2_memops videobuf2_core snd_seq kvm videodev ttm snd_seq_device
> snd_timer drm_kms_helper drm k10temp serio_raw edac_core snd edac_mce_amd
> sp5100_tco soundcore i2c_algo_bit i2c_piix4 mac_hid wmi nls_utf8 cifs
> fscache parport_pc ppdev lp parport usb_storage pata_acpi psmouse r8169
> ahci mii pata_atiixp libahci [  175.290340] CPU: 0 PID: 6468 Comm:
> mount.cifs Tainted: G        W     3.13.0-37-generic #64-Ubuntu [ 
> 175.290347] Hardware name: MSI MS-7693/970A-G46 (MS-7693), BIOS V1.9
> 08/14/2012 [  175.290349]  0000000000000009 ffff8800a917dbb0
> ffffffff8171ed09 ffff8800a917dbf8 [  175.290353]  ffff8800a917dbe8
> ffffffff8106773d ffff8800a917dd00 ffff8801ef46f000 [  175.290356] 
> ffff8800a917dcc8 0000000000000001 0000000000000000 ffff8800a917dc48 [ 
> 175.290359] Call Trace:
> [  175.290365]  [<ffffffff8171ed09>] dump_stack+0x45/0x56
> [  175.290369]  [<ffffffff8106773d>] warn_slowpath_common+0x7d/0xa0
> [  175.290372]  [<ffffffff810677ac>] warn_slowpath_fmt+0x4c/0x50
> [  175.290383]  [<ffffffffa00cb515>] smb_send_rqst+0x215/0x270 [cifs]
> [  175.290388]  [<ffffffff81690868>] ? __inet_stream_connect+0x208/0x320
> [  175.290398]  [<ffffffffa00cb5ad>] smb_sendv+0x3d/0x40 [cifs]
> [  175.290408]  [<ffffffffa00cb5d8>] smb_send+0x28/0x30 [cifs]
> [  175.290417]  [<ffffffffa00b515d>] generic_ip_connect+0x30d/0x3e0 [cifs]
> [  175.290421]  [<ffffffff811a1d75>] ? __kmalloc+0x55/0x230
> [  175.290430]  [<ffffffffa00b969c>] cifs_mount+0x85c/0xaf0 [cifs]
> [  175.290439]  [<ffffffffa00a8040>] cifs_do_mount+0xa0/0x4d0 [cifs]
> [  175.290444]  [<ffffffff811c10b9>] mount_fs+0x39/0x1b0
> [  175.290448]  [<ffffffff811dc457>] vfs_kern_mount+0x67/0x110
> [  175.290452]  [<ffffffff811decb4>] do_mount+0x244/0xb20
> [  175.290456]  [<ffffffff811530ae>] ? __get_free_pages+0xe/0x50
> [  175.290459]  [<ffffffff811de8f6>] ? copy_mount_options+0x36/0x170
> [  175.290462]  [<ffffffff811df883>] SyS_mount+0x83/0xc0
> [  175.290465]  [<ffffffff8172f82d>] system_call_fastpath+0x1a/0x1f
> [  175.290467] ---[ end trace 09da6c74f48063f9 ]---
> [  175.292487] CIFS VFS: Error connecting to socket. Aborting operation.
> [  175.292629] CIFS VFS: cifs_mount failed w/return code = -5