ALPHA4-amd64-r301975 UFS crashes on VMware Wks

Hello community,
( sorry for my bad english lang skills )
I would like to report problem with
FreeBSD-11.0-ALPHA4-amd64-20160617-r301975.

After clean install, while trying to install any binary packages with pkg
(ex: pkg install xorg )
Kernel crashes happen usually during any disk intensive operation.

( pkg upgrade wanted to upgrade two packages - get text and python27 )
Crash occured immediatelly after confirming pkg to continue ( y/N )

Jun 21 18:53:58 Auriga pkg: gettext-runtime upgraded: 0.19.7 -> 0.19.8.1
Jun 21 18:53:59 Auriga kernel: lock order reversal:
Jun 21 18:53:59 Auriga kernel: 1st 0xfffff80033631068 ufs (ufs) _at_
/usr/src/sys/kern/vfs_subr.c:2498
Jun 21 18:53:59 Auriga kernel: 2nd 0xfffffe00f625e170 bufwait (bufwait) _at_
/usr/src/sys/ufs/ffs/ffs_vnops.c:263
Jun 21 18:53:59 Auriga kernel: 3rd 0xfffff80033499068 ufs (ufs) _at_
/usr/src/sys/kern/vfs_subr.c:2498
Jun 21 18:53:59 Auriga kernel: stack backtrace:
Jun 21 18:53:59 Auriga kernel: #0 0xffffffff80aa7320 at
witness_debugger+0x70
Jun 21 18:53:59 Auriga kernel: #1 0xffffffff80aa7214 at
witness_checkorder+0xe54
Jun 21 18:53:59 Auriga kernel: #2 0xffffffff80a206d2 at __lockmgr_args+0x4c2
Jun 21 18:53:59 Auriga kernel: #3 0xffffffff80d09426 at ffs_lock+0xa6
Jun 21 18:53:59 Auriga kernel: #4 0xffffffff81014f2a at VOP_LOCK1_APV+0xea
Jun 21 18:53:59 Auriga kernel: #5 0xffffffff80b17b8a at _vn_lock+0x9a
Jun 21 18:53:59 Auriga kernel: #6 0xffffffff80b07fb3 at vget+0x63
Jun 21 18:53:59 Auriga kernel: #7 0xffffffff80afa84c at vfs_hash_get+0xcc
Jun 21 18:53:59 Auriga kernel: #8 0xffffffff80d05130 at ffs_vgetf+0x40
Jun 21 18:53:59 Auriga kernel: #9 0xffffffff80cfca21 at
softdep_sync_buf+0xb51
Jun 21 18:53:59 Auriga kernel: #10 0xffffffff80d0a016 at ffs_syncvnode+0x256
Jun 21 18:53:59 Auriga kernel: #11 0xffffffff80ce0d83 at ffs_truncate+0x8d3
Jun 21 18:53:59 Auriga kernel: #12 0xffffffff80d11741 at ufs_direnter+0x681
Jun 21 18:53:59 Auriga kernel: #13 0xffffffff80d1aa59 at ufs_makeinode+0x5e9
Jun 21 18:53:59 Auriga kernel: #14 0xffffffff80d165e3 at ufs_create+0x33
Jun 21 18:53:59 Auriga kernel: #15 0xffffffff8101281b at VOP_CREATE_APV+0xdb
Jun 21 18:53:59 Auriga kernel: #16 0xffffffff80b173d8 at vn_open_cred+0x2f8
Jun 21 18:53:59 Auriga kernel: #17 0xffffffff80b1075c at kern_openat+0x25c
Jun 21 18:54:01 Auriga pkg: python27 upgraded: 2.7.11_2 -> 2.7.11_3


After executing "pkg install xorg" - three crashes happened during
installation.

Running on VMware 12 Workstation. FreeBSD 10.3 RELEASE, Debian Linux,
Windows running there without any problems.

Is possible that filesystem is damaged/inconsistent after these crashes ?
data lost etc ?

Karel
( FBSD newbie )