LOR on head ...

Not sure if this is a known issue since I don't usually use UFS. 
Yesterday I put current on an acer laptop with an i3 processor/4GB RAM 
with UFS file system on a OCZ vertex 2 SSD and trim enabled via tunefs.

Below is the dmesg along with the LOR message at the bottom.   I can 
provide more information if it is helpful.


Copyright (c) 1992-2013 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 10.0-CURRENT #0: Sun Aug  4 16:54:51 UTC 2013
     root_at_beam.macktronics.com:/usr/obj/usr/src/sys/GENERIC amd64
FreeBSD clang version 3.3 (tags/RELEASE_33/final 183502) 20130610
WARNING: WITNESS option enabled, expect reduced performance.
CPU: Intel(R) Core(TM) i3-2370M CPU _at_ 2.40GHz (2394.61-MHz K8-class CPU)
   Origin = "GenuineIntel"  Id = 0x206a7  Family = 0x6  Model = 0x2a  Stepping = 7
   Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
   Features2=0x1dbae3bf<SSE3,PCLMULQDQ,DTES64,MON,DS_CPL,VMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,POPCNT,TSCDLT,XSAVE,OSXSAVE,AVX>
   AMD Features=0x28100800<SYSCALL,NX,RDTSCP,LM>
   AMD Features2=0x1<LAHF>
   TSC: P-state invariant, performance statistics
real memory  = 4294967296 (4096 MB)
avail memory = 3785801728 (3610 MB)
Event timer "LAPIC" quality 600
ACPI APIC Table: <ACRSYS ACRPRDCT>
FreeBSD/SMP: Multiprocessor System Detected: 4 CPUs
FreeBSD/SMP: 1 package(s) x 2 core(s) x 2 SMT threads
  cpu0 (BSP): APIC ID:  0
  cpu1 (AP): APIC ID:  1
  cpu2 (AP): APIC ID:  2
  cpu3 (AP): APIC ID:  3
ioapic0 <Version 2.0> irqs 0-23 on motherboard
kbd1 at kbdmux0
acpi0: <ACRSYS ACRPRDCT> on motherboard
acpi0: Power Button (fixed)
cpu0: <ACPI CPU> on acpi0
cpu1: <ACPI CPU> on acpi0
cpu2: <ACPI CPU> on acpi0
cpu3: <ACPI CPU> on acpi0
hpet0: <High Precision Event Timer> iomem 0xfed00000-0xfed003ff on acpi0
Timecounter "HPET" frequency 14318180 Hz quality 950
Event timer "HPET" frequency 14318180 Hz quality 550
Event timer "HPET1" frequency 14318180 Hz quality 440
Event timer "HPET2" frequency 14318180 Hz quality 440
Event timer "HPET3" frequency 14318180 Hz quality 440
Event timer "HPET4" frequency 14318180 Hz quality 440
atrtc0: <AT realtime clock> port 0x70-0x77 irq 8 on acpi0
atrtc0: Warning: Couldn't map I/O.
Event timer "RTC" frequency 32768 Hz quality 0
attimer0: <AT timer> port 0x40-0x43,0x50-0x53 irq 0 on acpi0
Timecounter "i8254" frequency 1193182 Hz quality 0
Event timer "i8254" frequency 1193182 Hz quality 100
Timecounter "ACPI-fast" frequency 3579545 Hz quality 900
acpi_timer0: <24-bit timer at 3.579545MHz> port 0x408-0x40b on acpi0
acpi_ec0: <Embedded Controller: GPE 0x17> port 0x62,0x66 on acpi0
pcib0: <ACPI Host-PCI bridge> port 0xcf8-0xcff on acpi0
pci0: <ACPI PCI bus> on pcib0
vgapci0: <VGA-compatible display> port 0x2000-0x203f mem 0xc0000000-0xc03fffff,0xb0000000-0xbfffffff irq 16 at device 2.0 on pci0
agp0: <SandyBridge mobile GT2 IG> on vgapci0
agp0: aperture size is 256M, detected 131068k stolen memory
pci0: <simple comms> at device 22.0 (no driver attached)
ehci0: <Intel Panther Point USB 2.0 controller> mem 0xc0609000-0xc06093ff irq 16 at device 26.0 on pci0
usbus0: EHCI version 1.0
usbus0 on ehci0
hdac0: <Intel Panther Point HDA Controller> mem 0xc0600000-0xc0603fff irq 22 at device 27.0 on pci0
pcib1: <ACPI PCI-PCI bridge> irq 17 at device 28.0 on pci0
pci2: <ACPI PCI bus> on pcib1
bge0: <Broadcom BCM57765 B0, ASIC rev. 0x57785100> mem 0xc0430000-0xc043ffff,0xc0440000-0xc044ffff irq 16 at device 0.0 on pci2
bge0: CHIP ID 0x57785100; ASIC REV 0x57785; CHIP REV 0x577851; PCI-E
miibus0: <MII bus> on bge0
brgphy0: <BCM57765 1000BASE-T media interface> PHY 1 on miibus0
brgphy0:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, 1000baseT, 1000baseT-master, 1000baseT-FDX, 1000baseT-FDX-master, auto, auto-flow
bge0: Ethernet address: dc:0e:a1:b1:e8:d4
sdhci_pci0: <Generic SD HCI> mem 0xc0400000-0xc040ffff irq 17 at device 0.1 on pci2
sdhci_pci0: 1 slot(s) allocated
pci2: <base peripheral> at device 0.2 (no driver attached)
pci2: <base peripheral> at device 0.3 (no driver attached)
pcib2: <ACPI PCI-PCI bridge> irq 16 at device 28.1 on pci0
pci3: <ACPI PCI bus> on pcib2
ath0: <Atheros AR9485> mem 0xc0500000-0xc057ffff irq 17 at device 0.0 on pci3
ar9300_set_stub_functions: setting stub functions
ar9300_set_stub_functions: setting stub functions
ar9300_attach: calling ar9300_hw_attach
ar9300_hw_attach: calling ar9300_eeprom_attach
ar9300_flash_map: unimplemented for now
Restoring Cal data from DRAM
Restoring Cal data from EEPROM
Restoring Cal data from Flash
Restoring Cal data from Flash
Restoring Cal data from OTP
ar9300_hw_attach: ar9300_eeprom_attach returned 0
ath0: RX status length: 48
ath0: RX buffer size: 4096
ath0: TX descriptor length: 128
ath0: TX status length: 36
ath0: TX buffers per descriptor: 4
ar9300_freebsd_setup_x_tx_desc: called, 0x0/0, 0x0/0, 0x0/0
ath0: ath_edma_setup_rxfifo: type=0, FIFO depth = 16 entries
ath0: ath_edma_setup_rxfifo: type=1, FIFO depth = 128 entries
ath0: [HT] enabling HT modes
ath0: [HT] enabling short-GI in 20MHz mode
ath0: [HT] 1 stream STBC receive enabled
ath0: [HT] 1 RX streams; 1 TX streams
ath0: AR9485 mac 576.1 RF5110 phy 829.5
ath0: 2GHz radio: 0x0000; 5GHz radio: 0x0000
ehci1: <Intel Panther Point USB 2.0 controller> mem 0xc0608000-0xc06083ff irq 23 at device 29.0 on pci0
usbus1: EHCI version 1.0
usbus1 on ehci1
isab0: <PCI-ISA bridge> at device 31.0 on pci0
isa0: <ISA bus> on isab0
ahci0: <Intel Panther Point AHCI SATA controller> port 0x2088-0x208f,0x2094-0x2097,0x2080-0x2087,0x2090-0x2093,0x2060-0x207f mem 0xc0607000-0xc06077ff irq 19 at device 31.2 on pci0
ahci0: AHCI v1.30 with 6 6Gbps ports, Port Multiplier not supported
ahcich0: <AHCI channel> at channel 0 on ahci0
ahcich2: <AHCI channel> at channel 2 on ahci0
ahciem0: <AHCI enclosure management bridge> on ahci0
pci0: <serial bus, SMBus> at device 31.3 (no driver attached)
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: [GIANT-LOCKED]
psm0: model Generic PS/2 mouse, device ID 0
battery0: <ACPI Control Method Battery> on acpi0
acpi_acad0: <AC Adapter> on acpi0
acpi_button0: <Power Button> on acpi0
acpi_lid0: <Control Method Lid Switch> on acpi0
acpi_button1: <Sleep Button> on acpi0
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 isa0
ppc0: cannot reserve I/O port range
est0: <Enhanced SpeedStep Frequency Control> on cpu0
p4tcc0: <CPU Frequency Thermal Control> on cpu0
est1: <Enhanced SpeedStep Frequency Control> on cpu1
p4tcc1: <CPU Frequency Thermal Control> on cpu1
est2: <Enhanced SpeedStep Frequency Control> on cpu2
p4tcc2: <CPU Frequency Thermal Control> on cpu2
est3: <Enhanced SpeedStep Frequency Control> on cpu3
p4tcc3: <CPU Frequency Thermal Control> on cpu3
Timecounters tick every 1.000 msec
hdacc0: <Realtek ALC269 HDA CODEC> at cad 0 on hdac0
hdaa0: <Realtek ALC269 Audio Function Group> at nid 1 on hdacc0
pcm0: <Realtek ALC269 (Analog 2.0+HP/2.0)> at nid 20,33 and 27 on hdaa0
pcm1: <Realtek ALC269 (Left Analog Mic)> at nid 24 on hdaa0
hdacc1: <Intel Panther Point HDA CODEC> at cad 3 on hdac0
hdaa1: <Intel Panther Point Audio Function Group> at nid 1 on hdacc1
pcm2: <Intel Panther Point (HDMI/DP 8ch)> at nid 5 on hdaa1
usbus0: 480Mbps High Speed USB v2.0
usbus1: 480Mbps High Speed USB v2.0
ugen0.1: <Intel> at usbus0
uhub0: <Intel EHCI root HUB, class 9/0, rev 2.00/1.00, addr 1> on usbus0
ugen1.1: <Intel> at usbus1
uhub1: <Intel EHCI root HUB, class 9/0, rev 2.00/1.00, addr 1> on usbus1
ada0 at ahcich0 bus 0 scbus0 target 0 lun 0
ada0: <OCZ-VERTEX2 1.35> ATA-8 SATA 2.x device
ada0: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO 8192bytes)
ada0: Command Queueing enabled
ada0: 76319MB (156301488 512 byte sectors: 16H 63S/T 16383C)
ada0: quirks=0x1<4K>
ada0: Previously was known as ad4
ses0 at ahciem0 bus 0 scbus2 target 0 lun 0
ses0: <AHCI SGPIO Enclosure 1.00 0001> SEMB S-E-S 2.00 device
ses0: SEMB SES Device
cd0 at ahcich2 bus 0 scbus1 target 0 lun 0
cd0: <MATSHITA DVD-RAM UJ8B0AW 1.00> Removable CD-ROM SCSI-0 device 
cd0: 150.000MB/s transfers (SATA 1.x, UDMA5, ATAPI 12bytes, PIO 8192bytes)
cd0: Attempt to query device size failed: NOT READY, Medium not present - tray closed
SMP: AP CPU #1 Launched!
SMP: AP CPU #2 Launched!
SMP: AP CPU #3 Launched!
Timecounter "TSC-low" frequency 1197304466 Hz quality 1000
WARNING: WITNESS option enabled, expect reduced performance.
Root mount waiting for: usbus1 usbus0
uhub0: 2 ports with 2 removable, self powered
uhub1: 2 ports with 2 removable, self powered
Root mount waiting for: usbus1 usbus0
ugen0.2: <vendor 0x8087> at usbus0
uhub2: <vendor 0x8087 product 0x0024, class 9/0, rev 2.00/0.00, addr 2> on usbus0
ugen1.2: <vendor 0x8087> at usbus1
uhub3: <vendor 0x8087 product 0x0024, class 9/0, rev 2.00/0.00, addr 2> on usbus1
Root mount waiting for: usbus1 usbus0
uhub2: 6 ports with 6 removable, self powered
uhub3: 8 ports with 8 removable, self powered
ugen0.3: <HD WebCam> at usbus0
Trying to mount root from ufs:/dev/gpt/acer1 [rw]...
ar9300_Stub_GetCTSTimeout: called
ar9300_Stub_GetCTSTimeout: called
ar9300_Stub_GetAntennaSwitch: called
ar9300_Stub_GetAntennaSwitch: called
wlan0: Ethernet address: 44:6d:57:91:61:3d
lock order reversal:
  1st 0xffffff80ec5844e0 bufwait (bufwait) _at_ /usr/src/sys/kern/vfs_bio.c:3061
  2nd 0xfffffe0046273200 dirhash (dirhash) _at_ /usr/src/sys/ufs/ufs/ufs_dirhash.c:284
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xffffff81166ca2d0
kdb_backtrace() at kdb_backtrace+0x39/frame 0xffffff81166ca380
witness_checkorder() at witness_checkorder+0xd4f/frame 0xffffff81166ca410
_sx_xlock() at _sx_xlock+0x75/frame 0xffffff81166ca450
ufsdirhash_add() at ufsdirhash_add+0x3b/frame 0xffffff81166ca490
ufs_direnter() at ufs_direnter+0x688/frame 0xffffff81166ca550
ufs_rename() at ufs_rename+0xedb/frame 0xffffff81166ca760
VOP_RENAME_APV() at VOP_RENAME_APV+0xf5/frame 0xffffff81166ca790
kern_renameat() at kern_renameat+0x3df/frame 0xffffff81166ca9a0
amd64_syscall() at amd64_syscall+0x265/frame 0xffffff81166caab0
Xfast_syscall() at Xfast_syscall+0xfb/frame 0xffffff81166caab0
--- syscall (128, FreeBSD ELF64, sys_rename), rip = 0x801c509ca, rsp = 0x7fffffffccb8, rbp = 0x7fffffffccc0 ---


dan
--
Dan Mack