Another lock. Several smbd processes hold lock-up files. Impossible to kill 
them because they are in state D. Failed to restart samba and make file system 
umount.
smbd process stack:
[<ffffffffc023ac3b>] cv_wait_common+0x10b/0x140 [spl]
[<ffffffffc023ac85>] __cv_wait+0x15/0x20 [spl]
[<ffffffffc04b0875>] zfs_dirent_lock+0x175/0x590 [zfs]
[<ffffffffc04b243b>] zfs_get_xattrdir+0x12b/0x1b0 [zfs]
[<ffffffffc04c6324>] zfs_lookup+0x1c4/0x310 [zfs]
[<ffffffffc04e3ef4>] zpl_xattr_get_dir+0x64/0x110 [zfs]
[<ffffffffc04e4d5b>] zpl_xattr_get+0xbb/0x1a0 [zfs]
[<ffffffffc04e4e9f>] zpl_xattr_user_get+0x5f/0x80 [zfs]
[<ffffffff8123636b>] generic_getxattr+0x4b/0x70
[<ffffffff81236898>] vfs_getxattr+0x88/0xb0
[<ffffffff81236e28>] getxattr+0xa8/0x200
[<ffffffff81236fe5>] path_getxattr+0x65/0xb0
[<ffffffff81237714>] SyS_getxattr+0x14/0x20
[<ffffffff818446b2>] entry_SYSCALL_64_fastpath+0x16/0x71
[<ffffffffffffffff>] 0xffffffffffffffff

smbd status:
Name:   smbd
State:  D (disk sleep)
Tgid:   451
Ngid:   451
Pid:    451
PPid:   1
TracerPid:      0
Uid:    65534   65534   0       65534
Gid:    0       3608    0       3608
FDSize: 64
Groups: 65534 
NStgid: 451
NSpid:  451
NSpgid: 74623
NSsid:  74623
VmPeak:   482860 kB
VmSize:   482860 kB
VmLck:         0 kB
VmPin:         0 kB
VmHWM:     22528 kB
VmRSS:     19760 kB
VmData:   100048 kB
VmStk:       132 kB
VmExe:        64 kB
VmLib:     33124 kB
VmPTE:       720 kB
VmPMD:        16 kB
VmSwap:        0 kB
HugetlbPages:          0 kB
Threads:        1
SigQ:   412/514626
SigPnd: 0000000000000100
ShdPnd: 0000000000004100
SigBlk: 0000000000001880
SigIgn: 0000000000002000
SigCgt: 0000000580014461
CapInh: 0000000000000000
CapPrm: 0000003fffffffff
CapEff: 0000000000000000
CapBnd: 0000003fffffffff
CapAmb: 0000000000000000
Seccomp:        0
Cpus_allowed:   ffffffff,ffffffff,ffffffff,ffffffff,ffffffff,ffffffff
Cpus_allowed_list:      0-191
Mems_allowed:   00000000,00000003
Mems_allowed_list:      0-1
voluntary_ctxt_switches:        121
nonvoluntary_ctxt_switches:     299

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https://bugs.launchpad.net/bugs/1722261

Title:
  deadlock in mount umount and sync

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