RHEL6: Kernel panic when the native client unmounts a Red Hat Storage volume

Issue

While running the GlusterFS testsuite on RHEL-6.4 the kernel panics reliably:

BUG: Dentry ffff8801eb4e9800{i=0,n=files9995} still in use (1) [unmount of fuse fuse]
------------[ cut here ]------------
kernel BUG at fs/dcache.c:670!
invalid opcode: 0000 [#1] SMP 
last sysfs file: /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/infiniband/mlx4_0/node_guid
CPU 3 
Modules linked in: xfs exportfs nfs lockd fscache auth_rpcgss nfs_acl sunrpc ib_ipoib rdma_ucm ib_ucm ib_uverbs ib_umad rdma_cm ib_cm iw_cm ib_addr ipv6 fuse r8169 mii sg serio_raw i2c_i801 iTCO_wdt iTCO_vendor_support shpchp snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep snd_seq snd_seq_device snd_pcm snd_timer snd soundcore snd_page_alloc mlx4_ib ib_sa ib_mad ib_core mlx4_en mlx4_core xhci_hcd ext4 mbcache jbd2 sd_mod crc_t10dif ahci i915 drm_kms_helper drm i2c_algo_bit i2c_core video output dm_mirror dm_region_hash dm_log dm_mod [last unloaded: scsi_wait_scan]

Pid: 16277, comm: umount Not tainted 2.6.32-358.11.1.el6.x86_64 #1 System manufacturer System Product Name/P8Z77-V LX2
RIP: 0010:[<ffffffff8119a9d8>]  [<ffffffff8119a9d8>] shrink_dcache_for_umount_subtree+0x2a8/0x2b0
RSP: 0018:ffff8801f71dfdb8  EFLAGS: 00010292
RAX: 000000000000005c RBX: ffff8801eb4e9800 RCX: 000000000000f21b
RDX: 0000000000000000 RSI: 0000000000000046 RDI: 0000000000000246
RBP: ffff8801f71dfdf8 R08: 0000000000000000 R09: 0000000000000001
R10: ffffffff81641bc0 R11: ffff880217537b8b R12: 0000000000000d0b
R13: ffffffff81a83fc0 R14: ffff8801b3f58780 R15: ffff8801eb4e9860
FS:  00007f66d09e4740(0000) GS:ffff88002c380000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f66d004b360 CR3: 00000001af6e6000 CR4: 00000000000407e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process umount (pid: 16277, threadinfo ffff8801f71de000, task ffff8801f7364040)
Stack:
 ffff880204cf5e70 ffff8801f7364040 0000000000000015 ffff880204cf5c00
<d> ffffffffa034c200 ffff8801f7102b38 ffff880204cf5c00 ffff88021c1ee380
<d> ffff8801f71dfe18 ffffffff8119aa16 0000000000000000 ffff880204cf5c00
Call Trace:
 [<ffffffff8119aa16>] shrink_dcache_for_umount+0x36/0x60
 [<ffffffff8118336f>] generic_shutdown_super+0x1f/0xe0
 [<ffffffff81183496>] kill_anon_super+0x16/0x60
 [<ffffffffa03495d2>] fuse_kill_sb_anon+0x52/0x60 [fuse]
 [<ffffffff81183c37>] deactivate_super+0x57/0x80
 [<ffffffff811a1c2f>] mntput_no_expire+0xbf/0x110
 [<ffffffff811a269b>] sys_umount+0x7b/0x3a0
 [<ffffffff810dc847>] ? audit_syscall_entry+0x1d7/0x200
 [<ffffffff8100b072>] system_call_fastpath+0x16/0x1b
Code: 50 30 4c 8b 0a 31 d2 48 85 f6 74 04 48 8b 56 40 48 05 70 02 00 00 48 89 de 48 c7 c7 80 39 7b 81 48 89 04 24 31 c0 e8 e8 2b 37 00 <0f> 0b eb fe 0f 0b eb fe 55 48 89 e5 53 48 83 ec 08 0f 1f 44 00 
RIP  [<ffffffff8119a9d8>] shrink_dcache_for_umount_subtree+0x2a8/0x2b0
 RSP <ffff8801f71dfdb8>