/tmp # ./kexec -d -l kernel.full
<stdout>: Warning (reg_format): "reg" property in /ibm,opal/flash@0 has invalid length (8 bytes) (#address-cells == 0, #size-cells == 0)
free memory map:
0x02400000-0x30000000
0x384c2000-0x80000000
kernel offset 0x10000 paddr 0x100000 filesz 17769064 memsz 23331784
add_kexec_segment kernel      buf 0x7fff82d60010 bufsize 0x010f2268, dest 0x2400000, memsize 0x01650000
Kernel entry: 0x100
add_kexec_segment device tree buf 0x7fff83e60010 bufsize 0x0004ce8c, dest 0x7ffb0000, memsize 0x00050000
add_kexec_segment trampoline  buf 0x173d0680 bufsize 0x00000210, dest 0x7ffa0000, memsize 0x00010000
free memory map after loading:
0x03a50000-0x30000000
0x384c2000-0x7ffa0000
/tmp # ./kexec -e
The system is going down NOW!
Sent SIGTERM to all processes
Sent SIGKILL to all processes
[   65.030280] kexec_core: Starting new kernel
[  144.423427668,5] OPAL: Switch to big-endian OS
[  144.437709936,5] OPAL: Switch to big-endian OS
KDB: debugger backends: ddb
KDB: current backend: ddb
---<<BOOT>>---
Copyright (c) 1992-2018 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 13.0-CURRENT #14 r339744M: Thu Oct 25 23:00:40 CDT 2018
    root@fledgling.east.rtk0.net:/usr/obj/usr/src/powerpc.powerpc64/sys/GENERIC64 powerpc
gcc version 6.4.0 (FreeBSD Ports Collection for powerpc64) 
WARNING: WITNESS option enabled, expect reduced performance.
VT: init without driver.
cpu0: IBM POWER9 revision 2.2, 3000.00 MHz
cpu0: Features dc007182<PPC32,PPC64,ALTIVEC,FPU,MMU,SMT,ISNOOP,ARCH205,ARCH206,VSX,TRUELE>
cpu0: Features2 eee00000<ARCH207,HTM,DSCR,ISEL,TAR,VCRYPTO,ARCH300,IEEE128,DARN>
real memory  = 137225691136 (130868 MB)
avail memory = 131861635072 (125753 MB)
FreeBSD/SMP: Multiprocessor System Detected: 64 CPUs
arc4random: no preloaded entropy cache
random: entropy device external interface
random: registering fast source PowerISA DARN random number generator
random: fast provider: "PowerISA DARN random number generator"
kbd0 at kbdmux0
ofwbus0: <Open Firmware Device Tree> on nexus0
simplebus0: <Flattened device tree simple bus> mem 0x6030000000000-0x60300ffffffff on ofwbus0
pcib0: <OPAL Host-PCI bridge> mem 0x600c3c0000000-0x600c3c0000fff,0x600c300000000-0x600c30fffffff on ofwbus0
pcib1: <OPAL Host-PCI bridge> mem 0x600c3c0100000-0x600c3c0100fff,0x600c320000000-0x600c32fffffff on ofwbus0
pcib2: <OPAL Host-PCI bridge> mem 0x600c3c0200000-0x600c3c0200fff,0x600c340000000-0x600c34fffffff on ofwbus0
pcib3: <OPAL Host-PCI bridge> mem 0x600c3c0300000-0x600c3c0300fff,0x600c360000000-0x600c36fffffff on ofwbus0
pcib4: <OPAL Host-PCI bridge> mem 0x600c3c0400000-0x600c3c0400fff,0x600c380000000-0x600c38fffffff on ofwbus0
pcib5: <OPAL Host-PCI bridge> mem 0x600c3c0500000-0x600c3c0500fff,0x600c3a0000000-0x600c3afffffff on ofwbus0
pcib6: <OPAL Host-PCI bridge> mem 0x620c3c0000000-0x620c3c0000fff,0x620c300000000-0x620c30fffffff on ofwbus0
pcib7: <OPAL Host-PCI bridge> mem 0x620c3c0100000-0x620c3c0100fff,0x620c320000000-0x620c32fffffff on ofwbus0
pcib8: <OPAL Host-PCI bridge> mem 0x620c3c0200000-0x620c3c0200fff,0x620c340000000-0x620c34fffffff on ofwbus0
pcib9: <OPAL Host-PCI bridge> mem 0x620c3c0300000-0x620c3c0300fff,0x620c360000000-0x620c36fffffff on ofwbus0
xicp0: <External Interrupt Presentation Controller> mem 0x6030203180000-0x603020318ffff,0x6030203190000-0x603020319ffff,0x60302031a0000-0x60302031affff,0x60302031b0000-0x60302031bffff on ofwbus0
xics0: <External Interrupt Source Controller> on ofwbus0
cpulist0: <Open Firmware CPU Group> on ofwbus0
cpu0: <Open Firmware CPU> on cpulist0
pmcr0: <Power Management Control Register> on cpu0
cpu1: <Open Firmware CPU> on cpulist0
pmcr1: <Power Management Control Register> on cpu1
cpu2: <Open Firmware CPU> on cpulist0
pmcr2: <Power Management Control Register> on cpu2
cpu3: <Open Firmware CPU> on cpulist0
pmcr3: <Power Management Control Register> on cpu3
cpu4: <Open Firmware CPU> on cpulist0
pmcr4: <Power Management Control Register> on cpu4
cpu5: <Open Firmware CPU> on cpulist0
pmcr5: <Power Management Control Register> on cpu5
cpu6: <Open Firmware CPU> on cpulist0
pmcr6: <Power Management Control Register> on cpu6
cpu7: <Open Firmware CPU> on cpulist0
pmcr7: <Power Management Control Register> on cpu7
cpu8: <Open Firmware CPU> on cpulist0
pmcr8: <Power Management Control Register> on cpu8
cpu9: <Open Firmware CPU> on cpulist0
pmcr9: <Power Management Control Register> on cpu9
cpu10: <Open Firmware CPU> on cpulist0
pmcr10: <Power Management Control Register> on cpu10
cpu11: <Open Firmware CPU> on cpulist0
pmcr11: <Power Management Control Register> on cpu11
cpu12: <Open Firmware CPU> on cpulist0
pmcr12: <Power Management Control Register> on cpu12
cpu13: <Open Firmware CPU> on cpulist0
pmcr13: <Power Management Control Register> on cpu13
cpu14: <Open Firmware CPU> on cpulist0
pmcr14: <Power Management Control Register> on cpu14
cpu15: <Open Firmware CPU> on cpulist0
pmcr15: <Power Management Control Register> on cpu15
opal0: <OPAL Abstraction Firmware> irq 1048560,1048561,1048562,1048563,1048564,1048565,1048566,1048567,1048568,1048569,1048570,1048571,1048572,1048573,2097136,2097137,2097138,2097139,2097140,2097141,2097142,2097147,2097148,2097149 on ofwbus0
opal0: registered as a time-of-day clock, resolution 0.002000s
opalcons0: <OPAL Consoles> on opal0
uart0: <OPAL Serial Port> on opalcons0
uart0: console
opalsens0: <OPAL Sensors> on opal0
opal_sensor0: <OPAL sensor> on opalsens0
opal_sensor1: <OPAL sensor> on opalsens0
opal_sensor2: <OPAL sensor> on opalsens0
opal_sensor3: <OPAL sensor> on opalsens0
opal_sensor4: <OPAL sensor> on opalsens0
opal_sensor5: <OPAL sensor> on opalsens0
opal_sensor6: <OPAL sensor> on opalsens0
opal_sensor7: <OPAL sensor> on opalsens0
opal_sensor8: <OPAL sensor> on opalsens0
opal_sensor9: <OPAL sensor> on opalsens0
opal_sensor10: <OPAL sensor> on opalsens0
opal_sensor11: <OPAL sensor> on opalsens0
opal_sensor12: <OPAL sensor> on opalsens0
opal_sensor13: <OPAL sensor> on opalsens0
opal_sensor14: <OPAL sensor> on opalsens0
opal_sensor15: <OPAL sensor> on opalsens0
opal_sensor16: <OPAL sensor> on opalsens0
opal_sensor17: <OPAL sensor> on opalsens0
opal_sensor18: <OPAL sensor> on opalsens0
opal_sensor19: <OPAL sensor> on opalsens0
opal_sensor20: <OPAL sensor> on opalsens0
opal_sensor21: <OPAL sensor> on opalsens0
opal_sensor22: <OPAL sensor> on opalsens0
opal_sensor23: <OPAL sensor> on opalsens0
opal_sensor24: <OPAL sensor> on opalsens0
opal_sensor25: <OPAL sensor> on opalsens0
opal_sensor26: <OPAL sensor> on opalsens0
opal_sensor27: <OPAL sensor> on opalsens0
opal_sensor28: <OPAL sensor> on opalsens0
opal_sensor29: <OPAL sensor> on opalsens0
opal_sensor30: <OPAL sensor> on opalsens0
opal_sensor31: <OPAL sensor> on opalsens0
opal_sensor32: <OPAL sensor> on opalsens0
opal_sensor33: <OPAL sensor> on opalsens0
opal_sensor34: <OPAL sensor> on opalsens0
opal_sensor35: <OPAL sensor> on opalsens0
opal_sensor36: <OPAL sensor> on opalsens0
opal_sensor37: <OPAL sensor> on opalsens0
opal_sensor38: <OPAL sensor> on opalsens0
opal_sensor39: <OPAL sensor> on opalsens0
opal_sensor40: <OPAL sensor> on opalsens0
opal_sensor41: <OPAL sensor> on opalsens0
opal_sensor42: <OPAL sensor> on opalsens0
opal_sensor43: <OPAL sensor> on opalsens0
opal_sensor44: <OPAL sensor> on opalsens0
opal_sensor45: <OPAL sensor> on opalsens0
opal_sensor46: <OPAL sensor> on opalsens0
opal_sensor47: <OPAL sensor> on opalsens0
opal_sensor48: <OPAL sensor> on opalsens0
opal_sensor49: <OPAL sensor> on opalsens0
opal_sensor50: <OPAL sensor> on opalsens0
opal_sensor51: <OPAL sensor> on opalsens0
opal_sensor52: <OPAL sensor> on opalsens0
opal_sensor53: <OPAL sensor> on opalsens0
opal_sensor54: <OPAL sensor> on opalsens0
opal_sensor55: <OPAL sensor> on opalsens0
opal_sensor56: <OPAL sensor> on opalsens0
opal_sensor57: <OPAL sensor> on opalsens0
opal_sensor58: <OPAL sensor> on opalsens0
opal_sensor59: <OPAL sensor> on opalsens0
opal_sensor60: <OPAL sensor> on opalsens0
opal_sensor61: <OPAL sensor> on opalsens0
opal_sensor62: <OPAL sensor> on opalsens0
opal_sensor63: <OPAL sensor> on opalsens0
opal_sensor64: <OPAL sensor> on opalsens0
opal_sensor65: <OPAL sensor> on opalsens0
opal_sensor66: <OPAL sensor> on opalsens0
opal_sensor67: <OPAL sensor> on opalsens0
opal_sensor68: <OPAL sensor> on opalsens0
opal_sensor69: <OPAL sensor> on opalsens0
opal_sensor70: <OPAL sensor> on opalsens0
opal_sensor71: <OPAL sensor> on opalsens0
opal_sensor72: <OPAL sensor> on opalsens0
opal_sensor73: <OPAL sensor> on opalsens0
opal_sensor74: <OPAL sensor> on opalsens0
opal_sensor75: <OPAL sensor> on opalsens0
pci0: <OFW PCI bus> on pcib0
pcib10: <OFW PCI-PCI bridge> at device 0.0 on pci0
pci10: <OFW PCI bus> on pcib10
nvme0: <Generic NVMe Device> mem 0x80000000-0x80003fff irq 1044472 at device 0.0 on pci10
nvme0:  Starting ready wait!
nvme0:  Starting ready wait!
nvme0:  Starting ready wait!
nvme0:  Starting ready wait!
nvme0:  Starting ready wait!
nvme0:  Starting ready wait!
pci1: <OFW PCI bus> on pcib1
pcib11: <OFW PCI-PCI bridge> at device 0.0 on pci1
pci11: <OFW PCI bus> on pcib11
nvme1: <Generic NVMe Device> mem 0x80000000-0x80003fff irq 1040376 at device 0.0 on pci11
nvme1:  Starting ready wait!
nvme1:  Starting ready wait!
nvme1:  Starting ready wait!
nvme1:  Starting ready wait!
nvme1:  Starting ready wait!
nvme1:  Starting ready wait!
pci2: <OFW PCI bus> on pcib2
pcib12: <OFW PCI-PCI bridge> at device 0.0 on pci2
pci12: <OFW PCI bus> on pcib12
pci3: <OFW PCI bus> on pcib3
pcib13: <OFW PCI-PCI bridge> at device 0.0 on pci3
pci13: <OFW PCI bus> on pcib13
xhci0: <XHCI (generic) USB 3.0 controller> mem 0x80000000-0x8000ffff,0x80010000-0x80011fff irq 1036280 at device 0.0 on pci13
xhci0: 64 bytes context size, 64-bit DMA
usbus0 on xhci0
pci4: <OFW PCI bus> on pcib4
pcib14: <OFW PCI-PCI bridge> at device 0.0 on pci4
pci14: <OFW PCI bus> on pcib14
bge0: <Broadcom unknown BCM5719, ASIC rev. 0x5719001> mem 0x6024000000000-0x602400000ffff,0x6024000010000-0x602400001ffff,0x6024000020000-0x602400002ffff irq 1032184 at device 0.0 on pci14
bge0: APE FW version: NCSI v1.3.12.0
bge0: CHIP ID 0x05719001; ASIC REV 0x5719; CHIP REV 0x57190; PCI-E
miibus0: <MII bus> on bge0
brgphy0: <BCM5719C 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: Using defaults for TSO: 65518/35/2048
bge0: Ethernet address: 2c:09:4d:00:01:f0
bge1: <Broadcom unknown BCM5719, ASIC rev. 0x5719001> mem 0x6024000030000-0x602400003ffff,0x6024000040000-0x602400004ffff,0x6024000050000-0x602400005ffff irq 1032185 at device 0.1 on pci14
bge1: APE FW version: NCSI v1.3.12.0
bge1: CHIP ID 0x05719001; ASIC REV 0x5719; CHIP REV 0x57190; PCI-E
miibus1: <MII bus> on bge1
brgphy1: <BCM5719C 1000BASE-T media interface> PHY 2 on miibus1
brgphy1:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, 1000baseT, 1000baseT-master, 1000baseT-FDX, 1000baseT-FDX-master, auto, auto-flow
bge1: Using defaults for TSO: 65518/35/2048
bge1: Ethernet address: 2c:09:4d:00:01:f1
pci5: <OFW PCI bus> on pcib5
pcib15: <OFW PCI-PCI bridge> at device 0.0 on pci5
pci15: <OFW PCI bus> on pcib15
pcib16: <OFW PCI-PCI bridge> irq 1030136 at device 0.0 on pci15
pci16: <OFW PCI bus> on pcib16
vgapci0: <VGA-compatible display> mem 0x80000000-0x80ffffff,0x81000000-0x8101ffff irq 1030136 at device 0.0 on pci16
pci6: <OFW PCI bus> on pcib6
pcib17: <OFW PCI-PCI bridge> at device 0.0 on pci6
pci17: <OFW PCI bus> on pcib17
pci7: <OFW PCI bus> on pcib7
pcib18: <OFW PCI-PCI bridge> at device 0.0 on pci7
pci18: <OFW PCI bus> on pcib18
mps0: <Avago Technologies (LSI) SAS2008> mem 0x800c0000-0x800c3fff,0x80080000-0x800bffff irq 2088952 at device 0.0 on pci18
mps0: Warning, doorbell still active
mps0: Firmware: 00.00.00.00, Driver: 21.02.00.00-fbsd
mps0: IOCCapabilities: 0
mps0: Failed to alloc queues with error 12
mps0: IOC Facts based allocation failed with error 12, exit
device_attach: mps0 attach returned 12
pci8: <OFW PCI bus> on pcib8
pcib19: <OFW PCI-PCI bridge> at device 0.0 on pci8
pci19: <OFW PCI bus> on pcib19
pci9: <OFW PCI bus> on pcib9
pcib20: <OFW PCI-PCI bridge> at device 0.0 on pci9
pci20: <OFW PCI bus> on pcib20
powernv_xscom0: <xscom> mem 0x603fc00000000-0x60403ffffffff on ofwbus0
opal_i2cm0: <centaur-i2cm> on powernv_xscom0
iichb0: <opal-i2c> on opal_i2cm0
iicbus0: <OFW I2C bus> on iichb0
iic0: <I2C generic I/O> on iicbus0
iicbus0: <unknown card> at addr 0xa0
iichb1: <opal-i2c> on opal_i2cm0
iicbus1: <OFW I2C bus> on iichb1
iic1: <I2C generic I/O> on iicbus1
iicbus1: <unknown card> at addr 0xa0
opal_i2cm1: <centaur-i2cm> on powernv_xscom0
iichb2: <opal-i2c> on opal_i2cm1
iicbus2: <OFW I2C bus> on iichb2
iic2: <I2C generic I/O> on iicbus2
iicbus2: <unknown card> at addr 0xa0
opal_i2cm2: <centaur-i2cm> on powernv_xscom0
iichb3: <opal-i2c> on opal_i2cm2
iicbus3: <OFW I2C bus> on iichb3
iic3: <I2C generic I/O> on iicbus3
iicbus3: <unknown card> at addr 0xa4
iichb4: <opal-i2c> on opal_i2cm2
iicbus4: <OFW I2C bus> on iichb4
iic4: <I2C generic I/O> on iicbus4
iicbus4: <unknown card> at addr 0xac
powernv_xscom1: <xscom> mem 0x623fc00000000-0x62403ffffffff on ofwbus0
opal_i2cm3: <centaur-i2cm> on powernv_xscom1
iichb5: <opal-i2c> on opal_i2cm3
iicbus5: <OFW I2C bus> on iichb5
iic5: <I2C generic I/O> on iicbus5
iicbus5: <unknown card> at addr 0xa0
iichb6: <opal-i2c> on opal_i2cm3
iicbus6: <OFW I2C bus> on iichb6
iic6: <I2C generic I/O> on iicbus6
iicbus6: <unknown card> at addr 0xa0
opal_i2cm4: <centaur-i2cm> on powernv_xscom1
iichb7: <opal-i2c> on opal_i2cm4
iicbus7: <OFW I2C bus> on iichb7
iic7: <I2C generic I/O> on iicbus7
iicbus7: <unknown card> at addr 0xa4
iichb8: <opal-i2c> on opal_i2cm4
iicbus8: <OFW I2C bus> on iichb8
iic8: <I2C generic I/O> on iicbus8
iicbus8: <unknown card> at addr 0xac
Timecounter "timebase" frequency 512000000 Hz quality 0
Event timer "decrementer" frequency 512000000 Hz quality 1000
Timecounters tick every 1.000 msec
usbus0: 5.0Gbps Super Speed USB v3.0
ugen0.1: <0x104c XHCI root HUB> at usbus0
uhub0: <0x104c XHCI root HUB, class 9/0, rev 3.00/1.00, addr 1> on usbus0
nda0 at nvme0 bus 0 scbus0 target 0 lun 1
nda0: <Samsung SSD 960 EVO 500GB 2B7QCXE7 S3EUNX0J226460K>
nda0: nvme version 1.2 x4 (max x4) lanes PCIe Gen3 (max Gen3) link
nda0: 476940MB (976773168 512 byte sectors)
SMP: AP CPU #3 launched
SMP: AP CPU #20 launched
SMP: AP CPU #11 launched
SMP: AP CPU #34 launched
SMP: AP CPU #42 launched
SMP: AP CPU #49 launched
SMP: AP CPU #43 launched
SMP: AP CPU #14 launched
SMP: AP CPU #52 launched
SMP: AP CPU #55 launched
SMP: AP CPU #46 launched
SMP: AP CPU #56 launched
SMP: AP CPU #57 launched
SMP: AP CPU #16 launched
SMP: AP CPU #10 launched
SMP: AP CPU #17 launched
SMP: AP CPU #50 launched
SMP: AP CPU #35 launched
SMP: AP CPU #44 launched
SMP: AP CPU #47 launched
SMP: AP CPU #59 launched
SMP: AP CPU #1 launched
SMP: AP CPU #22 launched
SMP: AP CPU #24 launched
SMP: AP CPU #30 launched
SMP: AP CPU #39 launched
SMP: AP CPU #15 launched
SMP: AP CPU #2 launched
SMP: AP CPU #5 launched
SMP: AP CPU #7 launched
SMP: AP CPU #60 launched
SMP: AP CPU #6 launched
SMP: AP CPU #27 launched
SMP: AP CPU #58 launched
SMP: AP CPU #25 launched
SMP: AP CPU #18 launched
SMP: AP CPU #31 launched
SMP: AP CPU #12 launched
SMP: AP CPU #19 launched
SMP: AP CPU #29 launched
SMP: AP CPU #13 launched
SMP: AP CPU #32 launched
SMP: AP CPU #63 launched
SMP: AP CPU #61 launched
SMP: AP CPU #23 launched
SMP: AP CPU #62 launched
SMP: AP CPU #54 launched
SMP: AP CPU #9 launched
SMP: AP CPU #48 launched
SMP: AP CPU #33 launched
SMP: AP CPU #37 launched
SMP: AP CPU #28 launched
SMP: AP CPU #40 launched
SMP: AP CPU #41 launched
SMP: AP CPU #51 launched
SMP: AP CPU #53 launched
SMP: AP CPU #8 launched
SMP: AP CPU #36 launched
SMP: AP CPU #26 launched
SMP: AP CPU #38 launched
SMP: AP CPU #4 launched
SMP: AP CPU #21 launched
SMP: AP CPU #45 launched
nda1 at nvme1 bus 0 scbus1 target 0 lun 1
WARNING: WITNESS option enabled, expect reduced performance.
nda1: <Samsung SSD 960 PRO 512GB 2B6QCXP7 S3EWNX0K206146M>
nda1: nvme version 1.2 x4 (max x4) lanes PCIe Gen3 (max Gen3) link
nda1: 488386MB (1000215216 512 byte sectors)
uhub0: 8 ports with 8 removable, self powered
Root mount waiting for: usbus0
usbd_setup_ctrl_transfer: Length (2) greater than remaining length (0)
usbd_setup_ctrl_transfer: Length (4) greater than remaining length (0)
usbd_setup_ctrl_transfer: Length (9) greater than remaining length (0)
usbd_setup_ctrl_transfer: Length (18) greater than remaining length (0)
Root mount waiting for: usbus0
usbd_setup_ctrl_transfer: Length (18) greater than remaining length (0)
usbd_setup_ctrl_transfer: Length (18) greater than remaining length (0)
usbd_setup_ctrl_transfer: Length (18) greater than remaining length (0)
usbd_setup_ctrl_transfer: Length (18) greater than remaining length (0)
usbd_setup_ctrl_transfer: Length (18) greater than remaining length (0)
usbd_setup_ctrl_transfer: Length (18) greater than remaining length (0)
Root mount waiting for: usbus0
usbd_setup_ctrl_transfer: Length (18) greater than remaining length (0)
usbd_setup_device_desc: getting device descriptor at addr 1 failed, USB_ERR_STALLED
usbd_setup_ctrl_transfer: Length (18) greater than remaining length (0)
Root mount waiting for: usbus0

fatal kernel trap:

   exception       = 0x300 (data storage interrupt)
   virtual address = 0x2c
   dsisr           = 0x40000000
   srr0            = 0xc0000000027b51a0 (0x4b51a0)
   srr1            = 0x9000000000009032
   current msr     = 0x9000000000009032
   lr              = 0xc0000000027a6690 (0x4a6690)
   curthread       = 0xc000000008740000
          pid = 15, comm = usbus0

[ thread pid 15 tid 100189 ]
Stopped at      usb_pc_cpu_flush+0x8:   lwz     r9, 0x2c(r3)
db>