Decided to try clang 3.4 under CURRENT and got a LOR under ESXi:

Feb 17 14:13:10 Head kernel: lock order reversal:
Feb 17 14:13:10 Head kernel: 1st 0xfffffe00f6868548 bufwait (bufwait)
@ /usr/src/sys/kern/vfs_bio.c:3081
Feb 17 14:13:10 Head kernel: 2nd 0xfffff800035d3c00 dirhash (dirhash)
@ /usr/src/sys/ufs/ufs/ufs_dirhash.c:284
Feb 17 14:13:10 Head kernel: KDB: stack backtrace:
Feb 17 14:13:10 Head kernel: db_trace_self_wrapper() at
db_trace_self_wrapper+0x2b/frame 0xfffffe00f67ea2d0
Feb 17 14:13:10 Head kernel: kdb_backtrace() at kdb_backtrace+0x39/frame
Feb 17 14:13:10 Head kernel: witness_checkorder() at witness_checkorder
+0xdc2/frame 0xfffffe00f67ea410
Feb 17 14:13:10 Head kernel: _sx_xlock() at _sx_xlock+0x75/frame
Feb 17 14:13:10 Head kernel: ufsdirhash_add() at ufsdirhash_add
+0x3a/frame 0xfffffe00f67ea490
Feb 17 14:13:10 Head kernel: ufs_direnter() at ufs_direnter+0x5e8/frame
Feb 17 14:13:10 Head kernel: ufs_mkdir() at ufs_mkdir+0x89c/frame
Feb 17 14:13:10 Head kernel: VOP_MKDIR_APV() at VOP_MKDIR_APV+0xf7/frame
Feb 17 14:13:10 Head kernel: kern_mkdirat() at kern_mkdirat+0x209/frame
Feb 17 14:13:10 Head kernel: amd64_syscall() at amd64_syscall
+0x25a/frame 0xfffffe00f67eaab0
Feb 17 14:13:10 Head kernel: Xfast_syscall() at Xfast_syscall+0xfb/frame
Feb 17 14:13:10 Head kernel: --- syscall (136, FreeBSD ELF64,
sys_mkdir), rip = 0x801d3220a, rsp = 0x7fffffffce08, rbp =
0x7fffffffce20 ---

root@Head:/usr/share/sendmail/cf # uname -a
FreeBSD Head 11.0-CURRENT FreeBSD 11.0-CURRENT #0 r262009: Mon Feb 17
12:53:11 PST 2014     root@Head:/usr/obj/usr/src/sys/GENERIC  amd64

Copyright (c) 1992-2014 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
        The Regents of the University of California. All rights reserved.
FreeBSD is a registered trademark of The FreeBSD Foundation.
FreeBSD 11.0-CURRENT #0 r262009: Mon Feb 17 12:53:11 PST 2014
    root@Head:/usr/obj/usr/src/sys/GENERIC amd64
FreeBSD clang version 3.4 (tags/RELEASE_34/final 197956) 20140216
WARNING: WITNESS option enabled, expect reduced performance.
CPU: AMD FX(tm)-8150 Eight-Core Processor            (3616.16-MHz
K8-class CPU)
  Origin="AuthenticAMD"  Id=0x600f12  Family=0x15  Model=0x1  Stepping=2


  AMD Features=0x2a500800<SYSCALL,NX,MMX+,FFXSR,RDTSCP,LM>
  TSC: P-state invariant
real memory  = 4294967296 (4096 MB)
avail memory = 4100911104 (3910 MB)
Event timer "LAPIC" quality 400
ACPI APIC Table: <PTLTD          APIC  >
FreeBSD/SMP: Multiprocessor System Detected: 4 CPUs
FreeBSD/SMP: 4 package(s) x 1 core(s)
 cpu0 (BSP): APIC ID:  0
 cpu1 (AP): APIC ID:  1
 cpu2 (AP): APIC ID:  2
 cpu3 (AP): APIC ID:  3
MADT: Forcing active-low polarity and level trigger for SCI
ioapic0 <Version 1.1> irqs 0-23 on motherboard
random: <Software, Yarrow> initialized
kbd1 at kbdmux0
acpi0: <INTEL 440BX> on motherboard
acpi0: Power Button (fixed)
Timecounter "HPET" frequency 14318180 Hz quality 950
cpu0: <ACPI CPU> on acpi0
cpu1: <ACPI CPU> on acpi0
cpu2: <ACPI CPU> on acpi0
cpu3: <ACPI CPU> on acpi0
attimer0: <AT timer> port 0x40-0x43 irq 0 on acpi0
Timecounter "i8254" frequency 1193182 Hz quality 0
Event timer "i8254" frequency 1193182 Hz quality 100
atrtc0: <AT realtime clock> port 0x70-0x71 irq 8 on acpi0
Event timer "RTC" frequency 32768 Hz quality 0
Timecounter "ACPI-fast" frequency 3579545 Hz quality 900
acpi_timer0: <24-bit timer at 3.579545MHz> port 0x1008-0x100b on acpi0
pcib0: <ACPI Host-PCI bridge> port 0xcf8-0xcff on acpi0
pci0: <ACPI PCI bus> on pcib0
pcib1: <ACPI PCI-PCI bridge> at device 1.0 on pci0
pci1: <ACPI PCI bus> on pcib1
isab0: <PCI-ISA bridge> at device 7.0 on pci0
isa0: <ISA bus> on isab0
atapci0: <Intel PIIX4 UDMA33 controller> port
0x1f0-0x1f7,0x3f6,0x170-0x177,0x376,0x10c0-0x10cf at device 7.1 on pci0
ata0: <ATA channel> at channel 0 on atapci0
ata1: <ATA channel> at channel 1 on atapci0
pci0: <bridge> at device 7.3 (no driver attached)
pci0: <base peripheral> at device 7.7 (no driver attached)
vgapci0: <VGA-compatible display> port 0x10d0-0x10df mem
0xd8000000-0xdbffffff,0xd0800000-0xd0ffffff irq 16 at device 15.0 on
vgapci0: Boot video device
pcib2: <ACPI PCI-PCI bridge> at device 17.0 on pci0
pci2: <ACPI PCI bus> on pcib2
pcib3: <ACPI PCI-PCI bridge> at device 21.0 on pci0
pci3: <ACPI PCI bus> on pcib3
mpt0: <LSILogic SAS/SATA Adapter> port 0x4000-0x40ff mem
0xd2410000-0xd2413fff,0xd2400000-0xd240ffff irq 18 at device 0.0 on pci3
mpt0: MPI Version=
pcib4: <ACPI PCI-PCI bridge> at device 21.1 on pci0
pci4: <ACPI PCI bus> on pcib4
pcib5: <ACPI PCI-PCI bridge> at device 21.2 on pci0
pci5: <ACPI PCI bus> on pcib5
pcib6: <ACPI PCI-PCI bridge> at device 21.3 on pci0
pci6: <ACPI PCI bus> on pcib6
pcib7: <ACPI PCI-PCI bridge> at device 21.4 on pci0
pci7: <ACPI PCI bus> on pcib7
pcib8: <ACPI PCI-PCI bridge> at device 21.5 on pci0
pci8: <ACPI PCI bus> on pcib8
pcib9: <ACPI PCI-PCI bridge> at device 21.6 on pci0
pci9: <ACPI PCI bus> on pcib9
pcib10: <ACPI PCI-PCI bridge> at device 21.7 on pci0
pci10: <ACPI PCI bus> on pcib10
pcib11: <ACPI PCI-PCI bridge> at device 22.0 on pci0
pci11: <ACPI PCI bus> on pcib11
vmx0: <VMware VMXNET3 Ethernet Adapter> port 0x5000-0x500f mem
0xd2504000-0xd2504fff,0xd2503000-0xd2503fff,0xd2500000-0xd2501fff irq 19
at device 0.0 on pci11
vmx0: Ethernet address: 00:0c:29:b1:e6:22
pcib12: <ACPI PCI-PCI bridge> at device 22.1 on pci0
pci12: <ACPI PCI bus> on pcib12
pcib13: <ACPI PCI-PCI bridge> at device 22.2 on pci0
pci13: <ACPI PCI bus> on pcib13
pcib14: <ACPI PCI-PCI bridge> at device 22.3 on pci0
pci14: <ACPI PCI bus> on pcib14
pcib15: <ACPI PCI-PCI bridge> at device 22.4 on pci0
pci15: <ACPI PCI bus> on pcib15
pcib16: <ACPI PCI-PCI bridge> at device 22.5 on pci0
pci16: <ACPI PCI bus> on pcib16
pcib17: <ACPI PCI-PCI bridge> at device 22.6 on pci0
pci17: <ACPI PCI bus> on pcib17
pcib18: <ACPI PCI-PCI bridge> at device 22.7 on pci0
pci18: <ACPI PCI bus> on pcib18
pcib19: <ACPI PCI-PCI bridge> at device 23.0 on pci0
pci19: <ACPI PCI bus> on pcib19
pcib20: <ACPI PCI-PCI bridge> at device 23.1 on pci0
pci20: <ACPI PCI bus> on pcib20
pcib21: <ACPI PCI-PCI bridge> at device 23.2 on pci0
pci21: <ACPI PCI bus> on pcib21
pcib22: <ACPI PCI-PCI bridge> at device 23.3 on pci0
pci22: <ACPI PCI bus> on pcib22
pcib23: <ACPI PCI-PCI bridge> at device 23.4 on pci0
pci23: <ACPI PCI bus> on pcib23
pcib24: <ACPI PCI-PCI bridge> at device 23.5 on pci0
pci24: <ACPI PCI bus> on pcib24
pcib25: <ACPI PCI-PCI bridge> at device 23.6 on pci0
pci25: <ACPI PCI bus> on pcib25
pcib26: <ACPI PCI-PCI bridge> at device 23.7 on pci0
pci26: <ACPI PCI bus> on pcib26
pcib27: <ACPI PCI-PCI bridge> at device 24.0 on pci0
pci27: <ACPI PCI bus> on pcib27
pcib28: <ACPI PCI-PCI bridge> at device 24.1 on pci0
pci28: <ACPI PCI bus> on pcib28
pcib29: <ACPI PCI-PCI bridge> at device 24.2 on pci0
pci29: <ACPI PCI bus> on pcib29
pcib30: <ACPI PCI-PCI bridge> at device 24.3 on pci0
pci30: <ACPI PCI bus> on pcib30
pcib31: <ACPI PCI-PCI bridge> at device 24.4 on pci0
pci31: <ACPI PCI bus> on pcib31
pcib32: <ACPI PCI-PCI bridge> at device 24.5 on pci0
pci32: <ACPI PCI bus> on pcib32
pcib33: <ACPI PCI-PCI bridge> at device 24.6 on pci0
pci33: <ACPI PCI bus> on pcib33
pcib34: <ACPI PCI-PCI bridge> at device 24.7 on pci0
pci34: <ACPI PCI bus> on pcib34
acpi_acad0: <AC Adapter> on acpi0
atkbdc0: <Keyboard controller (i8042)> port 0x60,0x64 irq 1 on acpi0
atkbd0: <AT Keyboard> irq 1 on atkbdc0
kbd0 at atkbd0
atkbd0: [GIANT-LOCKED]
psm0: <PS/2 Mouse> irq 12 on atkbdc0
psm0: model IntelliMouse, device ID 3
ppc0: <Parallel port> port 0x378-0x37f irq 7 on acpi0
ppc0: Generic chipset (NIBBLE-only) in COMPATIBLE mode
ppbus0: <Parallel port bus> on ppc0
lpt0: <Printer> on ppbus0
lpt0: Interrupt-driven port
ppi0: <Parallel I/O> on ppbus0
uart0: <16550 or compatible> port 0x3f8-0x3ff irq 4 flags 0x10 on acpi0
uart1: <16550 or compatible> port 0x2f8-0x2ff irq 3 on acpi0
fdc0: <floppy drive controller> port 0x3f0-0x3f5,0x3f7 irq 6 drq 2 on
fd0: <1440-KB 3.5" drive> on fdc0 drive 0
orm0: <ISA Option ROMs> at iomem
0xc0000-0xc7fff,0xca000-0xcafff,0xdc000-0xdffff,0xe0000-0xe7fff on isa0
sc0: <System console> at flags 0x100 on isa0
sc0: VGA <16 virtual consoles, flags=0x300>
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on
acpi_throttle0: <ACPI CPU Throttling> on cpu0
acpi_throttle1: <ACPI CPU Throttling> on cpu1
acpi_throttle1: failed to attach P_CNT
device_attach: acpi_throttle1 attach returned 6
acpi_throttle2: <ACPI CPU Throttling> on cpu2
acpi_throttle2: failed to attach P_CNT
device_attach: acpi_throttle2 attach returned 6
acpi_throttle3: <ACPI CPU Throttling> on cpu3
acpi_throttle3: failed to attach P_CNT
device_attach: acpi_throttle3 attach returned 6
Timecounters tick every 10.000 msec
random: unblocking device.
da0 at mpt0 bus 0 scbus2 target 0 lun 0
da0: <VMware Virtual disk 1.0> Fixed Direct Access SCSI-2 device 
da0: 300.000MB/s transfers
da0: Command Queueing enabled
da0: 16384MB (33554432 512 byte sectors: 255H 63S/T 2088C)
da1 at mpt0 bus 0 scbus2 target 1 lun 0
da1: <VMware Virtual disk 1.0> Fixed Direct Access SCSI-2 device 
da1: 300.000MB/s transfers
da1: Command Queueing enabled
da1: 8192MB (16777216 512 byte sectors: 255H 63S/T 1044C)
cd0 at ata1 bus 0 scbus1 target 0 lun 0
cd0: <NECVMWar VMware IDE CDR10 1.00> Removable CD-ROM SCSI-0 device 
cd0: Serial Number 10000000000000000001
cd0: 33.300MB/s transfers (UDMA2, ATAPI 12bytes, PIO 65534bytes)
cd0: Attempt to query device size failed: NOT READY, Medium not present
Netvsc initializing... done!
SMP: AP CPU #1 Launched!
SMP: AP CPU #3 Launched!
SMP: AP CPU #2 Launched!
WARNING: WITNESS option enabled, expect reduced performance.
Trying to mount root from ufs:/dev/da0p2 [rw]...
lock order reversal:
 1st 0xfffffe00f6868548 bufwait (bufwait)
@ /usr/src/sys/kern/vfs_bio.c:3081
 2nd 0xfffff800035d3c00 dirhash (dirhash)
@ /usr/src/sys/ufs/ufs/ufs_dirhash.c:284
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame
kdb_backtrace() at kdb_backtrace+0x39/frame 0xfffffe00f67ea380
witness_checkorder() at witness_checkorder+0xdc2/frame
_sx_xlock() at _sx_xlock+0x75/frame 0xfffffe00f67ea450
ufsdirhash_add() at ufsdirhash_add+0x3a/frame 0xfffffe00f67ea490
ufs_direnter() at ufs_direnter+0x5e8/frame 0xfffffe00f67ea550
ufs_mkdir() at ufs_mkdir+0x89c/frame 0xfffffe00f67ea740
VOP_MKDIR_APV() at VOP_MKDIR_APV+0xf7/frame 0xfffffe00f67ea770
kern_mkdirat() at kern_mkdirat+0x209/frame 0xfffffe00f67ea9a0
amd64_syscall() at amd64_syscall+0x25a/frame 0xfffffe00f67eaab0
Xfast_syscall() at Xfast_syscall+0xfb/frame 0xfffffe00f67eaab0
--- syscall (136, FreeBSD ELF64, sys_mkdir), rip = 0x801d3220a, rsp =
0x7fffffffce08, rbp = 0x7fffffffce20 ---

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