KDB: debugger backends: ddb
KDB: current backend: ddb
Copyright (c) 1992-2017 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 12.0-CURRENT #2 r326733M: Sun Dec 10 17:08:15 CET 2017
    pho@mercat1.netperf.freebsd.org:/usr/src/sys/amd64/compile/PHO amd64
FreeBSD clang version 5.0.0 (tags/RELEASE_500/final 312559) (based on LLVM 5.0.0svn)
WARNING: WITNESS option enabled, expect reduced performance.
WARNING: DIAGNOSTIC option enabled, expect reduced performance.
VT(vga): resolution 640x480
CPU: Intel(R) Xeon(R) CPU E5-1650 v3 @ 3.50GHz (3500.07-MHz K8-class CPU)
  Origin="GenuineIntel"  Id=0x306f2  Family=0x6  Model=0x3f  Stepping=2
  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=0x7ffefbff<SSE3,PCLMULQDQ,DTES64,MON,DS_CPL,VMX,SMX,EST,TM2,SSSE3,SDBG,FMA,CX16,xTPR,PDCM,PCID,DCA,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,TSCDLT,AESNI,XSAVE,OSXSAVE,AVX,F16C,RDRAND>
  AMD Features=0x2c100800<SYSCALL,NX,Page1GB,RDTSCP,LM>
  AMD Features2=0x21<LAHF,ABM>
  Structured Extended Features=0x37ab<FSGSBASE,TSCADJ,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,PQM,NFPUSG>
  XSAVE Features=0x1<XSAVEOPT>
  VT-x: PAT,HLT,MTF,PAUSE,EPT,UG,VPID,VID,PostIntr
  TSC: P-state invariant, performance statistics
real memory  = 34359738368 (32768 MB)
avail memory = 33180852224 (31643 MB)
Event timer "LAPIC" quality 600
ACPI APIC Table: <SUPERM SMCI--MB>
FreeBSD/SMP: Multiprocessor System Detected: 12 CPUs
FreeBSD/SMP: 1 package(s) x 6 core(s) x 2 hardware threads
arc4random: no preloaded entropy cache
ioapic0 <Version 2.0> irqs 0-23 on motherboard
ioapic1 <Version 2.0> irqs 24-47 on motherboard
SMP: AP CPU #1 Launched!
SMP: AP CPU #11 Launched!
SMP: AP CPU #2 Launched!
SMP: AP CPU #8 Launched!
SMP: AP CPU #4 Launched!
SMP: AP CPU #5 Launched!
SMP: AP CPU #3 Launched!
SMP: AP CPU #6 Launched!
SMP: AP CPU #10 Launched!
SMP: AP CPU #7 Launched!
SMP: AP CPU #9 Launched!
Timecounter "TSC-low" frequency 1750036992 Hz quality 1000
random: entropy device external interface
[ath_hal] loaded
module_register_init: MOD_LOAD (vesa, 0xffffffff80f95c20, 0) error 19
random: registering fast source Intel Secure Key RNG
random: fast provider: "Intel Secure Key RNG"
kbd1 at kbdmux0
netmap: loaded module
nexus0
vtvga0: <VT VGA driver> on motherboard
cryptosoft0: <software crypto> on motherboard
acpi0: <SUPERM SMCI--MB> 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
cpu4: <ACPI CPU> on acpi0
cpu5: <ACPI CPU> on acpi0
cpu6: <ACPI CPU> on acpi0
cpu7: <ACPI CPU> on acpi0
cpu8: <ACPI CPU> on acpi0
cpu9: <ACPI CPU> on acpi0
cpu10: <ACPI CPU> on acpi0
cpu11: <ACPI CPU> on acpi0
atrtc0: <AT realtime clock> port 0x70-0x71,0x74-0x77 irq 8 on acpi0
atrtc0: registered as a time-of-day clock, resolution 1.000000s
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
hpet0: <High Precision Event Timer> iomem 0xfed00000-0xfed003ff on acpi0
Timecounter "HPET" frequency 14318180 Hz quality 950
Event timer "HPET" frequency 14318180 Hz quality 350
Event timer "HPET1" frequency 14318180 Hz quality 340
Event timer "HPET2" frequency 14318180 Hz quality 340
Event timer "HPET3" frequency 14318180 Hz quality 340
Event timer "HPET4" frequency 14318180 Hz quality 340
Event timer "HPET5" frequency 14318180 Hz quality 340
Event timer "HPET6" frequency 14318180 Hz quality 340
Event timer "HPET7" frequency 14318180 Hz quality 340
Timecounter "ACPI-fast" frequency 3579545 Hz quality 900
acpi_timer0: <24-bit timer at 3.579545MHz> port 0x408-0x40b on acpi0
pcib0: <ACPI Host-PCI bridge> on acpi0
pci0: <ACPI PCI bus> on pcib0
pci0: <dasp, performance counters> at device 11.1 (no driver attached)
pci0: <dasp, performance counters> at device 11.2 (no driver attached)
pci0: <dasp, performance counters> at device 16.1 (no driver attached)
pci0: <dasp, performance counters> at device 16.6 (no driver attached)
pci0: <dasp, performance counters> at device 18.1 (no driver attached)
acpi_syscontainer0: <System Container> on acpi0
acpi_syscontainer1: <System Container> on acpi0
acpi_syscontainer2: <System Container> on acpi0
acpi_syscontainer3: <System Container> on acpi0
pcib1: <ACPI Host-PCI bridge> port 0xcf8-0xcff on acpi0
pci1: <ACPI PCI bus> on pcib1
pcib2: <ACPI PCI-PCI bridge> irq 26 at device 1.0 on pci1
pci2: <ACPI PCI bus> on pcib2
pcib3: <ACPI PCI-PCI bridge> irq 32 at device 2.0 on pci1
pci3: <ACPI PCI bus> on pcib3
pci3: <network, ethernet> at device 0.0 (no driver attached)
pci3: <network, ethernet> at device 0.1 (no driver attached)
pcib4: <ACPI PCI-PCI bridge> irq 40 at device 3.0 on pci1
pci4: <ACPI PCI bus> on pcib4
pci1: <unknown> at device 17.0 (no driver attached)
ahci0: <Intel Wellsburg AHCI SATA controller> port 0xf110-0xf117,0xf100-0xf103,0xf0f0-0xf0f7,0xf0e0-0xf0e3,0xf020-0xf03f mem 0xfb438000-0xfb4387ff irq 16 at device 17.4 on pci1
ahci0: AHCI v1.30 with 4 6Gbps ports, Port Multiplier not supported
ahcich0: <AHCI channel> at channel 0 on ahci0
ahcich1: <AHCI channel> at channel 1 on ahci0
ahcich2: <AHCI channel> at channel 2 on ahci0
ahcich3: <AHCI channel> at channel 3 on ahci0
ahciem0: <AHCI enclosure management bridge> on ahci0
xhci0: <Intel Wellsburg USB 3.0 controller> mem 0xfb400000-0xfb40ffff irq 19 at device 20.0 on pci1
xhci0: 32 bytes context size, 64-bit DMA
usbus0 on xhci0
usbus0: 5.0Gbps Super Speed USB v3.0
pci1: <simple comms> at device 22.0 (no driver attached)
pci1: <simple comms> at device 22.1 (no driver attached)
ehci0: <Intel Wellsburg USB 2.0 controller> mem 0xfb434000-0xfb4343ff irq 18 at device 26.0 on pci1
usbus1: EHCI version 1.0
usbus1 on ehci0
usbus1: 480Mbps High Speed USB v2.0
pcib5: <ACPI PCI-PCI bridge> irq 16 at device 28.0 on pci1
pci5: <ACPI PCI bus> on pcib5
pcib6: <ACPI PCI-PCI bridge> irq 18 at device 28.2 on pci1
pci6: <ACPI PCI bus> on pcib6
pcib7: <ACPI PCI-PCI bridge> at device 0.0 on pci6
pci7: <ACPI PCI bus> on pcib7
vgapci0: <VGA-compatible display> port 0xe000-0xe07f mem 0xfa000000-0xfaffffff,0xfb000000-0xfb01ffff irq 18 at device 0.0 on pci7
vgapci0: Boot video device
pcib8: <ACPI PCI-PCI bridge> irq 16 at device 28.4 on pci1
pci8: <ACPI PCI bus> on pcib8
igb0: <Intel(R) PRO/1000 PCI-Express Network Driver> port 0xd020-0xd03f mem 0xfb320000-0xfb33ffff,0xfb344000-0xfb347fff irq 16 at device 0.0 on pci8
igb0: attach_pre capping queues at 8
igb0: using 1024 tx descriptors and 1024 rx descriptors
igb0: msix_init qsets capped at 8
igb0: pxm cpus: 6 queue msgs: 9 admincnt: 1
igb0: queue equality override not set, capping rx_queues at 6 and tx_queues at 6
igb0: using 6 rx queues 6 tx queues 
iugen1.2: <vendor 0x8087 product 0x800a> at usbus1
uhub3 on uhub1
uhub3: <vendor 0x8087 product 0x800a, class 9/0, rev 2.00/0.05, addr 2> on usbus1
ugen2.2: <vendor 0x8087 product 0x8002> at usbus2
uhub4 on uhub2
uhub4: <vendor 0x8087 product 0x8002, class 9/0, rev 2.00/0.05, addr 2> on usbus2
ugen0.2: <vendor 0x0557 product 0x7000> at usbus0
uhub5 on uhub0
uhub5: <vendor 0x0557 product 0x7000, class 9/0, rev 2.00/0.00, addr 1> on usbus0
uhub3: 6 ports with 6 removable, self powered
uhub5: 4 ports with 3 removable, self powered
uhub4: 8 ports with 8 removable, self powered
Writing entropy lock order reversal:
 1st 0xfffffe0000c3fef0 bufwait (bufwait) @ kern/vfs_bio.c:3564
 2nd 0xfffff80003a11400 dirhash (dirhash) @ ufs/ufs/ufs_dirhash.c:289
stack backtrace:
file:#0 0xffffffff80acabc3 at witness_debugger+0x73
#1 0xffffffff80acaa42 at witness_checkorder+0xe02
#2 0xffffffff80a6ee38 at _sx_xlock+0x68
#3 0xffffffff80d671c7 at ufsdirhash_remove+0x47
#4 0xffffffff80d6bfb9 at ufs_dirremove+0x129
#5 0xffffffff80d71d95 at ufs_remove+0x75
#6 0xffffffff81093bdd at VOP_REMOVE_APV+0x11d
#7 0xffffffff80b403e8 at kern_unlinkat+0x1e8
#8 0xffffffff80f16d1b at amd64_syscall+0x7ab
#9 0xffffffff80ef4bdb at Xfast_syscall+0xfb
.
Setting hostname: mercat1.netperf.freebsd.org.
ugen0.3: <vendor 0x0557 product 0x2419> at usbus0
ukbd0 on uhub5
ukbd0: <vendor 0x0557 product 0x2419, class 0/0, rev 1.10/1.00, addr 2> on usbus0
kbd2 at ukbd0
Starting sshd.
Starting cron.

Sun Dec 10 17:12
FreeBSD/amd64 (mercat1.netperf.freebsd.org) (ttyu1)

login: root
Dec 10 17:12:13 mercat1 login: ROOT LOGIN (root) ON ttyu1
Last login: Sun Dec 10 15:47:47 on ttyu1
FreeBSD 12.0-CURRENT (PHO) #2 r326733M: Sun Dec 10 17:08:15 CET 2017

Welcome to FreeBSD!

Before seeking technical support, please use the following resources:

o  Security advisories and updated errata information for all releases are
   at http://www.FreeBSD.org/releases/ - always consult the ERRATA section
   for your release first as it's updated frequently.

o  The Handbook and FAQ documents are at http://www.FreeBSD.org/ and,
   along with the mailing lists, can be searched by going to
   http://www.FreeBSD.org/search/.  If the doc package has been installed
   (or fetched via pkg install lang-freebsd-doc, where lang is the
   2-letter language code, e.g. en), they are also available formatted
   in /usr/local/share/doc/freebsd.

If you still have a question or problem, please take the output of
`uname -a', along with any relevant error messages, and email it
as a question to the questions@FreeBSD.org mailing list.  If you are
unfamiliar with FreeBSD's directory layout, please refer to the hier(7)
manual page.  If you are not familiar with manual pages, type `man man'.

Edit /etc/motd to change this login announcement.

20171210 17:12:38 all (1/1): devfs.sh
lock order reversal:
 1st 0xfffff8001a39a7b8 ufs (ufs) @ kern/vfs_mount.c:854
 2nd 0xfffff80034f09c98 devfs (devfs) @ kern/vfs_subr.c:2608
stack backtrace:
#0 0xffffffff80acabc3 at witness_debugger+0x73
#1 0xffffffff80acaa42 at witness_checkorder+0xe02
#2 0xffffffff80a3bcaf at lockmgr_lock_fast_path+0x1bf
#3 0xffffffff81094e81 at VOP_LOCK1_APV+0xe1
#4 0xffffffff80b46c56 at _vn_lock+0x66
#5 0xffffffff80b3509b at vget+0x9b
#6 0xffffffff8092cbdd at devfs_allocv+0xcd
#7 0xffffffff8092c6e3 at devfs_root+0x43
#8 0xffffffff80b2b95b at vfs_donmount+0x120b
#9 0xffffffff80b2a722 at sys_nmount+0x72
#10 0xffffffff80f16d1b at amd64_syscall+0x7ab
#11 0xffffffff80ef4bdb at Xfast_syscall+0xfb
20171210 17:17:39 all (1/1): devfs.sh
20171210 17:22:39 all (1/1): devfs.sh
20171210 17:27:39 all (1/1): devfs.sh
20171210 17:32:39 all (1/1): devfs.sh
20171210 17:37:39 all (1/1): devfs.sh
20171210 17:42:40 all (1/1): devfs.sh
20171210 17:47:40 all (1/1): devfs.sh
20171210 17:52:40 all (1/1): devfs.sh
20171210 17:57:40 all (1/1): devfs.sh
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20171210 18:12:40 all (1/1): devfs.sh
20171210 18:17:40 all (1/1): devfs.sh
20171210 18:22:40 all (1/1): devfs.sh
20171210 18:27:40 all (1/1): devfs.sh
20171210 18:32:40 all (1/1): devfs.sh
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20171210 21:12:43 all (1/1): devfs.sh
20171210 21:17:43 all (1/1): devfs.sh
20171210 21:22:43 all (1/1): devfs.sh
20171210 21:27:43 all (1/1): devfs.sh
20171210 21:32:43 all (1/1): devfs.sh
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20171211 00:27:46 all (1/1): devfs.sh
20171211 00:32:46 all (1/1): devfs.sh
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20171211 01:22:46 all (1/1): devfs.sh
20171211 01:27:47 all (1/1): devfs.sh
20171211 01:32:47 all (1/1): devfs.sh


Fatal trap 12: page fault while in kernel mode
cpuid = 7; apic id = 07
fault virtual address	= 0x70
fault code		= supervisor read data, page not present
instruction pointer	= 0x20:0xffffffff80b466f3
stack pointer	        = 0x28:0xfffffe00a114d7b0
frame pointer	        = 0x28:0xfffffe00a114d7c0
code segment		= base 0x0, limit 0xfffff, type 0x1b
			= DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags	= interrupt enabled, resume, IOPL = 0
current process		= 50927 (find)

(kgdb) l *0xffffffff80b466f3
0xffffffff80b466f3 is in vn_finished_write (../../../kern/vfs_vnops.c:1597).
1592
1593    static bool
1594    vn_suspendable(struct mount *mp)
1595    {
1596
1597            return (mp->mnt_op->vfs_susp_clean != NULL);
1598    }
1599
1600    /*
1601     * Preparing to start a filesystem write operation. If the operation is
(kgdb)