issue with kexec/kdump on imx6ull

Arthur LAMBERT
2018-04-09T13:58:52Z

Russell,

I was finally able to make it work by using mainline kernel (v4.16-rc7) :

# uname -a
Linux buildroot-imx6ull-evk 4.16.0-rc7 #2 SMP Mon Apr 9 10:00:16 CEST 2018 armv7l GNU/Linux
# sh kx.sh
Try gzip decompression.
kernel: 0xb6836008 kernel_size: 0x661cb8
MEMORY RANGES
0000000080000000-000000009fffffff (0)
zImage header: 0x016f2818 0x00000000 0x00661cb8
zImage size 0x661cb8, file size 0x661cb8
zImage requires 0x00672cb8 bytes
offset 0x00003ae0 tag 0x5a534c4b size 8
Decompressed kernel sizes:
text+data 0x01073700 bss 0x0078805c total 0x017fb75c
Resulting kernel space: 0x017fb75c
Reserved memory ranges
0000000098000000-000000009b1fffff (0)
Coredump memory ranges
0000000080000000-0000000097ffffff (0)
000000009b200000-000000009fffffff (0)
phys offset = 0x80000000, page offset = c0000000
Using 32-bit ELF core format
get_crash_notes_per_cpu: crash_notes addr = 9bbc3300, size = 180
Elf header: p_type = 4, p_offset = 0x9bbc3300 p_paddr = 0x9bbc3300 p_vaddr = 0x0 p_filesz = 0xb4 p_memsz = 0xb4
vmcoreinfo header: p_type = 4, p_offset = 0x9614e000 p_paddr = 0x9614e000 p_vaddr = 0x0 p_filesz = 0x1024 p_memsz = 0x1024
Elf header: p_type = 1, p_offset = 0x80000000 p_paddr = 0x80000000 p_vaddr = 0xc0000000 p_filesz = 0x18000000 p_memsz = 0x18000000
Elf header: p_type = 1, p_offset = 0x9b200000 p_paddr = 0x9b200000 p_vaddr = 0xdb200000 p_filesz = 0x4e00000 p_memsz = 0x4e00000
elfcorehdr: 0x9b100000
crashkernel: [0x98000000 - 0x9b1fffff] (50M)
memory range: [0x80000000 - 0x97ffffff] (384M)
memory range: [0x9b200000 - 0x9fffffff] (78M)
kernel command line: "console=ttymxc0,115200 root=/dev/mmcblk1p2 rootwait rw earlyprintk maxcpus=1 reset_devices elfcorehdr=0x9b100000 mem=50176K"
Kernel: address=0x98008000 size=0x017fb75c
DT : address=0x99805000 size=0x00007048
kexec_load: entry = 0x98008000 flags = 0x280001
nr_segments = 3
segment[0].buf = 0xb6836008
segment[0].bufsz = 0x661cbc
segment[0].mem = 0x98008000
segment[0].memsz = 0x662000
segment[1].buf = 0x2dd578
segment[1].bufsz = 0x7048
segment[1].mem = 0x99805000
segment[1].memsz = 0x8000
segment[2].buf = 0x2dd100
segment[2].bufsz = 0x400
segment[2].mem = 0x9b100000
segment[2].memsz = 0x1000
result2 : 0
do_shutdown : 0
do_exec2 : 0
kx.sh: kexec: success, dump kernel loaded.

# echo c > /proc/sysrq-trigger
[ 97.644343] sysrq: SysRq : Trigger a crash
[ 97.650383] Unable to handle kernel NULL pointer dereference at virtual address 00000000
[ 97.660345] pgd = 38b1f119
[ 97.663206] [00000000] *pgd=96760835, *pte=00000000, *ppte=00000000
[ 97.670050] Internal error: Oops: 817 [#1] SMP ARM
[ 97.674924] Modules linked in:
[ 97.678091] CPU: 0 PID: 139 Comm: sh Not tainted 4.16.0-rc7 #2
[ 97.683986] Hardware name: Freescale i.MX6 Ultralite (Device Tree)
[ 97.690262] PC is at sysrq_handle_crash+0x50/0x9c
[ 97.695046] LR is at sysrq_handle_crash+0x50/0x9c
[ 97.699817] pc : [<c04ed3e0>] lr : [<c04ed3e0>] psr: 60000013
[ 97.706154] sp : d677fe30 ip : d677fe30 fp : d677fe44
[ 97.711444] r10: 00000002 r9 : 00cbbfb8 r8 : 00000007
[ 97.716736] r7 : 00000000 r6 : c1035ab8 r5 : 00000001 r4 : 00000000
[ 97.723332] r3 : 00000000 r2 : b11156ce r1 : 00000002 r0 : 00000000
[ 97.729932] Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none
[ 97.737137] Control: 10c5387d Table: 9675006a DAC: 00000051
[ 97.742962] Process sh (pid: 139, stack limit = 0x6e0a260c)
[ 97.748605] Stack: (0xd677fe30 to 0xd6780000)
[ 97.753045] fe20: c101aa30 00000063 d677fe7c d677fe48
[ 97.761315] fe40: c04eda00 c04ed39c 00000000 00000000 c04ed928 b11156ce 00000000 00000002
[ 97.769584] fe60: 00cbbfb8 00000000 00000000 c1008908 d677fe94 d677fe80 c04ee01c c04ed934
[ 97.777854] fe80: d63166c0 c04edfa4 d677feb4 d677fe98 c02a23f0 c04edfb0 d676fdc0 c1008908
[ 97.786125] fea0: c02a238c d677ff68 d677ff34 d677feb8 c0236464 c02a2398 d677fedc d677fec8
[ 97.794395] fec0: c018c4ec c01706ac c107ab51 d604a1fc d677fef4 d677fee0 c018c8bc c018c478
[ 97.802664] fee0: d604a1fc 00000000 d677ff34 d677fef8 c0238594 c018c888 00000001 00000000
[ 97.810935] ff00: c023679c b11156ce 00000002 00000002 d676fdc0 00cbbfb8 d677ff68 c1008908
[ 97.819204] ff20: 00cbbfb8 00000002 d677ff64 d677ff38 c02366f4 c0236434 00000000 d676fdc0
[ 97.827474] ff40: d676fdc0 d676fdc0 00000000 00000000 c1008908 00cbbfb8 d677ffa4 d677ff68
[ 97.835743] ff60: c02368fc c0236658 00000000 00000000 ffffffff b11156ce 00000001 000c3c3c
[ 97.844011] ff80: 00000001 00cbbfb8 00000004 c01011c4 d677e000 00000000 00000000 d677ffa8
[ 97.852280] ffa0: c0101000 c02368b8 000c3c3c 00000001 00000001 00cbbfb8 00000002 00000000
[ 97.860548] ffc0: 000c3c3c 00000001 00cbbfb8 00000004 00000001 00000020 00000000 00092380
[ 97.868819] ffe0: 000c32f4 be897750 00019c14 b6ecd888 60000010 00000001 9bfde861 9bfdec61
[ 97.877051] Backtrace:
[ 97.879621] [<c04ed390>] (sysrq_handle_crash) from [<c04eda00>] (__handle_sysrq+0xd8/0x250)
[ 97.888048] r5:00000063 r4:c101aa30
[ 97.891719] [<c04ed928>] (__handle_sysrq) from [<c04ee01c>] (write_sysrq_trigger+0x78/0x90)
[ 97.900162] r8:c1008908 r7:00000000 r6:00000000 r5:00cbbfb8 r4:00000002
[ 97.906964] [<c04edfa4>] (write_sysrq_trigger) from [<c02a23f0>] (proc_reg_write+0x64/0x8c)
[ 97.915388] r5:c04edfa4 r4:d63166c0
[ 97.919069] [<c02a238c>] (proc_reg_write) from [<c0236464>] (__vfs_write+0x3c/0x14c)
[ 97.926897] r7:d677ff68 r6:c02a238c r5:c1008908 r4:d676fdc0
[ 97.932654] [<c0236428>] (__vfs_write) from [<c02366f4>] (vfs_write+0xa8/0x170)
[ 97.940059] r10:00000002 r9:00cbbfb8 r8:c1008908 r7:d677ff68 r6:00cbbfb8 r5:d676fdc0
[ 97.947952] r4:00000002
[ 97.950582] [<c023664c>] (vfs_write) from [<c02368fc>] (SyS_write+0x50/0xb4)
[ 97.957724] r9:00cbbfb8 r8:c1008908 r7:00000000 r6:00000000 r5:d676fdc0 r4:d676fdc0
[ 97.965566] [<c02368ac>] (SyS_write) from [<c0101000>] (ret_fast_syscall+0x0/0x28)
[ 97.973209] Exception stack(0xd677ffa8 to 0xd677fff0)
[ 97.978346] ffa0: 000c3c3c 00000001 00000001 00cbbfb8 00000002 00000000
[ 97.986612] ffc0: 000c3c3c 00000001 00cbbfb8 00000004 00000001 00000020 00000000 00092380
[ 97.994866] ffe0: 000c32f4 be897750 00019c14 b6ecd888
[ 98.000008] r10:00000000 r9:d677e000 r8:c01011c4 r7:00000004 r6:00cbbfb8 r5:00000001
[ 98.007901] r4:000c3c3c
[ 98.010520] Code: e3a04000 e5835000 ee074f9a ebf0ae76 (e5c45000)
[ 98.017549] Loading crashdump kernel...
[ 98.021956] Bye!
[ 0.000000] Booting Linux on physical CPU 0x0
[ 0.000000] Linux version 4.16.0-rc7 (arthur at arthur-bzh) (gcc version 5.4.0 (Buildroot 2017.05-git-38202-gb94bcd1-dirty)) #2 SMP Mon Apr 9 10:00:16 CEST 2018
[ 0.000000] CPU: ARMv7 Processor [410fc075] revision 5 (ARMv7), cr=10c5387d
[ 0.000000] CPU: div instructions available: patching division code
[ 0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
[ 0.000000] OF: fdt: Machine model: Freescale i.MX6 UlltraLite 14x14 EVK Board
[ 0.000000] OF: fdt: Ignoring memory range 0x80000000 - 0x98000000
[ 0.000000] Memory policy: Data cache writealloc
[ 0.000000] cma: Reserved 64 MiB at 0x9c000000
[ 0.000000] crashkernel reservation failed - No suitable area found.
[ 0.000000] random: fast init done
[ 0.000000] percpu: Embedded 16 pages/cpu @(ptrval) s36136 r8192 d21208 u65536
[ 0.000000] Built 1 zonelists, mobility grouping off. Total pages: 32512
[ 0.000000] Kernel command line: console=ttymxc0,115200 root=/dev/mmcblk1p2 rootwait rw crashkernel=50M
[ 0.000000] Dentry cache hash table entries: 16384 (order: 4, 65536 bytes)
[ 0.000000] Inode-cache hash table entries: 8192 (order: 3, 32768 bytes)
[ 0.000000] Memory: 40516K/131072K available (10240K kernel code, 493K rwdata, 3116K rodata, 1024K init, 7712K bss, 25020K reserved, 65536K cma-reserved, 0K highmem)
[ 0.000000] Virtual kernel memory layout:
[ 0.000000] vector : 0xffff0000 - 0xffff1000 ( 4 kB)
[ 0.000000] fixmap : 0xffc00000 - 0xfff00000 (3072 kB)
[ 0.000000] vmalloc : 0xc8800000 - 0xff800000 ( 880 MB)
[ 0.000000] lowmem : 0xc0000000 - 0xc8000000 ( 128 MB)
[ 0.000000] pkmap : 0xbfe00000 - 0xc0000000 ( 2 MB)
[ 0.000000] modules : 0xbf000000 - 0xbfe00000 ( 14 MB)
[ 0.000000] .text : 0x(ptrval) - 0x(ptrval) (11232 kB)
[ 0.000000] .init : 0x(ptrval) - 0x(ptrval) (1024 kB)
[ 0.000000] .data : 0x(ptrval) - 0x(ptrval) ( 494 kB)
[ 0.000000] .bss : 0x(ptrval) - 0x(ptrval) (7713 kB)
[ 0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[ 0.000000] Running RCU self tests
[ 0.000000] Hierarchical RCU implementation.
[ 0.000000] RCU event tracing is enabled.
[ 0.000000] RCU lockdep checking is enabled.
[ 0.000000] RCU restricting CPUs from NR_CPUS=4 to nr_cpu_ids=1.
[ 0.000000] RCU: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=1
[ 0.000000] NR_IRQS: 16, nr_irqs: 16, preallocated irqs: 16
[ 0.000000] Switching to timer-based delay loop, resolution 41ns
[ 0.000039] sched_clock: 32 bits at 24MHz, resolution 41ns, wraps every 89478484971ns
[ 0.000164] clocksource: mxc_timer1: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 79635851949 ns
[ 0.005752] Console: colour dummy device 80x30
[ 0.005908] Lock dependency validator: Copyright (c) 2006 Red Hat, Inc., Ingo Molnar
[ 0.005994] ... MAX_LOCKDEP_SUBCLASSES: 8
[ 0.006075] ... MAX_LOCK_DEPTH: 48
[ 0.006152] ... MAX_LOCKDEP_KEYS: 8191
[ 0.006229] ... CLASSHASH_SIZE: 4096
[ 0.006305] ... MAX_LOCKDEP_ENTRIES: 32768
[ 0.006382] ... MAX_LOCKDEP_CHAINS: 65536
[ 0.006458] ... CHAINHASH_SIZE: 32768
[ 0.006535] memory used by lock dependency info: 4655 kB
[ 0.006613] per task-struct memory footprint: 1536 bytes
[ 0.006813] Calibrating delay loop (skipped), value calculated using timer frequency.. 48.00 BogoMIPS (lpj=240000)
[ 0.006974] pid_max: default: 32768 minimum: 301
[ 0.008341] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.008483] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.016759] CPU: Testing write buffer coherency: ok
[ 0.020223] /cpus/cpu at 0 missing clock-frequency property
[ 0.020368] CPU0: thread -1, cpu 0, socket 0, mpidr 80000000
[ 0.025930] Setting up static identity map for 0x98100000 - 0x98100078
[ 0.027909] Hierarchical SRCU implementation.
[ 0.034865] smp: Bringing up secondary CPUs ...
[ 0.034995] smp: Brought up 1 node, 1 CPU
[ 0.035089] SMP: Total of 1 processors activated (48.00 BogoMIPS).
[ 0.035172] CPU: All CPU(s) started in SVC mode.
[ 0.043532] devtmpfs: initialized
[ 0.113484] VFP support v0.3: implementor 41 architecture 2 part 30 variant 7 rev 5
[ 0.116597] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
[ 0.116806] futex hash table entries: 256 (order: 2, 16384 bytes)
[ 0.129894] pinctrl core: initialized pinctrl subsystem
[ 0.145757] NET: Registered protocol family 16
[ 0.243835] DMA: preallocated 256 KiB pool for atomic coherent allocations
[ 0.255949] cpuidle: using governor menu
[ 0.314869] vdd3p0: supplied by regulator-dummy
[ 0.321357] cpu: supplied by regulator-dummy
[ 0.327471] vddsoc: supplied by regulator-dummy
[ 0.404580] No ATAGs?
[ 0.405380] hw-breakpoint: found 5 (+1 reserved) breakpoint and 4 watchpoint registers.
[ 0.405700] hw-breakpoint: maximum watchpoint size is 8 bytes.
[ 0.422291] imx6ul-pinctrl 20e0000.iomuxc: initialized IMX pinctrl driver
[ 0.652747] mxs-dma 1804000.dma-apbh: initialized
[ 0.667748] vgaarb: loaded
[ 0.672304] SCSI subsystem initialized
[ 0.677915] usbcore: registered new interface driver usbfs
[ 0.678738] usbcore: registered new interface driver hub
[ 0.679802] usbcore: registered new device driver usb
[ 0.691773] i2c i2c-1: IMX I2C adapter registered
[ 0.691971] i2c i2c-1: can't use DMA, using PIO instead.
[ 0.693984] media: Linux media interface: v0.10
[ 0.694835] Linux video capture interface: v2.00
[ 0.696548] pps_core: LinuxPPS API ver. 1 registered
[ 0.696662] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <giometti@linux.it>
[ 0.696932] PTP clock support registered
[ 0.700494] Advanced Linux Sound Architecture Driver Initialized.
[ 0.711609] Bluetooth: Core ver 2.22
[ 0.712158] NET: Registered protocol family 31
[ 0.712264] Bluetooth: HCI device and connection manager initialized
[ 0.712573] Bluetooth: HCI socket layer initialized
[ 0.712739] Bluetooth: L2CAP socket layer initialized
[ 0.713384] Bluetooth: SCO socket layer initialized
[ 0.720297] clocksource: Switched to clocksource mxc_timer1
[ 0.723029] VFS: Disk quotas dquot_6.6.0
[ 0.723725] VFS: Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
[ 0.843933] NET: Registered protocol family 2
[ 0.851780] tcp_listen_portaddr_hash hash table entries: 128 (order: 0, 5120 bytes)
[ 0.852217] TCP established hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.852463] TCP bind hash table entries: 1024 (order: 3, 36864 bytes)
[ 0.854423] TCP: Hash tables configured (established 1024 bind 1024)
[ 0.855634] UDP hash table entries: 256 (order: 2, 20480 bytes)
[ 0.856792] UDP-Lite hash table entries: 256 (order: 2, 20480 bytes)
[ 0.861713] NET: Registered protocol family 1
[ 0.869198] RPC: Registered named UNIX socket transport module.
[ 0.869451] RPC: Registered udp transport module.
[ 0.869549] RPC: Registered tcp transport module.
[ 0.869636] RPC: Registered tcp NFSv4.1 backchannel transport module.
[ 0.896606] Initialise system trusted keyrings
[ 0.898871] workingset: timestamp_bits=30 max_order=15 bucket_order=0
[ 0.978841] NFS: Registering the id_resolver key type
[ 0.979272] Key type id_resolver registered
[ 0.979518] Key type id_legacy registered
[ 0.980453] jffs2: version 2.2. (NAND) ?? 2001-2006 Red Hat, Inc.
[ 0.987498] fuse init (API version 7.26)
[ 1.049192] Key type asymmetric registered
[ 1.049606] Asymmetric key parser 'x509' registered
[ 1.051654] io scheduler noop registered
[ 1.051780] io scheduler deadline registered
[ 1.053248] io scheduler cfq registered (default)
[ 1.053376] io scheduler mq-deadline registered
[ 1.053477] io scheduler kyber registered
[ 1.077432] pwm-backlight backlight-display: backlight-display supply power not found, using dummy regulator
[ 1.088469] mxsfb 21c8000.lcdif: 21c8000.lcdif supply lcd not found, using dummy regulator
[ 1.089401] mxsfb 21c8000.lcdif: failed to find display phandle
[ 1.092942] mxsfb: probe of 21c8000.lcdif failed with error -2
[ 1.106588] imx-sdma 20ec000.sdma: Direct firmware load for imx/sdma/sdma-imx6q.bin failed with error -2
[ 1.107146] imx-sdma 20ec000.sdma: external firmware not found, using ROM firmware
[ 1.153209] 2020000.serial: ttymxc0 at MMIO 0x2020000 (irq = 19, base_baud = 5000000) is a IMX
[ 1.949747] console [ttymxc0] enabled
[ 1.967204] 21e8000.serial: ttymxc1 at MMIO 0x21e8000 (irq = 58, base_baud = 5000000) is a IMX
[ 2.008218] panel-simple panel: panel supply power not found, using dummy regulator
[ 2.142200] brd: module loaded
[ 2.251605] loop: module loaded
[ 2.279647] fsl-quadspi 21e0000.qspi: n25q256a (32768 Kbytes)
[ 2.313340] libphy: Fixed MDIO Bus: probed
[ 2.323646] CAN device driver interface
[ 2.337116] fec 20b4000.ethernet: 20b4000.ethernet supply phy not found, using dummy regulator
[ 2.354010] pps pps0: new PPS source ptp0
[ 2.362097] libphy: fec_enet_mii_bus: probed
[ 2.390515] fec 20b4000.ethernet eth0: registered PHC device 0
[ 2.402420] fec 2188000.ethernet: 2188000.ethernet supply phy not found, using dummy regulator
[ 2.418083] pps pps1: new PPS source ptp1
[ 2.567075] libphy: fec_enet_mii_bus: probed
[ 2.577879] fec 2188000.ethernet eth1: registered PHC device 1
[ 2.591196] usbcore: registered new interface driver asix
[ 2.597247] usbcore: registered new interface driver ax88179_178a
[ 2.604594] usbcore: registered new interface driver cdc_ether
[ 2.611427] usbcore: registered new interface driver net1080
[ 2.617697] usbcore: registered new interface driver cdc_subset
[ 2.624478] usbcore: registered new interface driver zaurus
[ 2.631127] usbcore: registered new interface driver cdc_ncm
[ 2.636995] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[ 2.643945] ehci-pci: EHCI PCI platform driver
[ 2.649005] ehci-mxc: Freescale On-Chip EHCI Host driver
[ 2.657739] usbcore: registered new interface driver usb-storage
[ 2.676820] imx_usb 2184000.usb: 2184000.usb supply vbus not found, using dummy regulator
[ 2.707848] imx_usb 2184200.usb: 2184200.usb supply vbus not found, using dummy regulator
[ 2.724690] ci_hdrc ci_hdrc.1: EHCI Host Controller
[ 2.731059] ci_hdrc ci_hdrc.1: new USB bus registered, assigned bus number 1
[ 2.760484] ci_hdrc ci_hdrc.1: USB 2.0 started, EHCI 1.00
[ 2.781259] hub 1-0:1.0: USB hub found
[ 2.786515] hub 1-0:1.0: 1 port detected
[ 2.815182] input: 20cc000.snvs:snvs-powerkey as /devices/soc0/soc/2000000.aips-bus/20cc000.snvs/20cc000.snvs:snvs-powerkey/input/input0
[ 2.843345] input: iMX6UL Touchscreen Controller as /devices/soc0/soc/2000000.aips-bus/2040000.tsc/input/input1
[ 2.875631] snvs_rtc 20cc000.snvs:snvs-rtc-lp: rtc core: registered 20cc000.snvs:snvs-rtc-lp as rtc0
[ 2.886817] i2c /dev entries driver
[ 2.897589] IR NEC protocol handler initialized
[ 2.908175] IR RC5(x/sz) protocol handler initialized
[ 2.913784] IR RC6 protocol handler initialized
[ 2.918522] IR JVC protocol handler initialized
[ 2.923462] IR Sony protocol handler initialized
[ 2.928271] IR SANYO protocol handler initialized
[ 2.933365] IR Sharp protocol handler initialized
[ 2.938253] IR MCE Keyboard/mouse protocol handler initialized
[ 2.944450] IR XMP protocol handler initialized
[ 2.972625] imx2-wdt 20bc000.wdog: timeout 60 sec (nowayout=0)
[ 2.979962] Bluetooth: HCI UART driver ver 2.3
[ 2.984950] Bluetooth: HCI UART protocol H4 registered
[ 2.992033] Bluetooth: HCI UART protocol LL registered
[ 3.002078] sdhci: Secure Digital Host Controller Interface driver
[ 3.008468] sdhci: Copyright(c) Pierre Ossman
[ 3.013257] sdhci-pltfm: SDHCI platform and OF driver helper
[ 3.026204] sdhci-esdhc-imx 2190000.usdhc: Got CD GPIO
[ 3.077076] mmc0: SDHCI controller on 2190000.usdhc [2190000.usdhc] using ADMA
[ 3.129576] mmc1: SDHCI controller on 2194000.usdhc [2194000.usdhc] using ADMA
[ 3.164547] usbcore: registered new interface driver usbhid
[ 3.170652] usbhid: USB HID core driver
[ 3.205588] mmc1: host does not support reading read-only switch, assuming write-enable
[ 3.232482] mmc1: new high speed SDHC card at address 0001
[ 3.271876] mmcblk1: mmc1:0001 SD8GB 7.24 GiB
[ 3.325903] mmcblk1: p1 p2
[ 3.334319] NET: Registered protocol family 10
[ 3.369117] Segment Routing with IPv6
[ 3.378273] sit: IPv6, IPv4 and MPLS over IPv4 tunneling driver
[ 3.394259] NET: Registered protocol family 17
[ 3.399069] can: controller area network core (rev 20170425 abi 9)
[ 3.406554] NET: Registered protocol family 29
[ 3.411512] can: raw protocol (rev 20170425)
[ 3.416314] can: broadcast manager protocol (rev 20170425 t)
[ 3.422547] can: netlink gateway (rev 20170425) max_hops=1
[ 3.431564] Key type dns_resolver registered
[ 3.455448] Registering SWP/SWPB emulation handler
[ 3.473848] Loading compiled-in X.509 certificates
[ 3.568479] imx_thermal tempmon: Commercial CPU temperature grade - max:95C critical:90C passive:85C
[ 3.589004] asoc-simple-card sound: wm8960-hifi <-> 202c000.sai mapping ok
[ 3.746667] snvs_rtc 20cc000.snvs:snvs-rtc-lp: setting system clock to 1970-01-01 00:01:41 UTC (101)
[ 3.759849] cfg80211: Loading compiled-in X.509 certificates for regulatory database
[ 3.775807] cfg80211: Loaded X.509 cert 'sforshee: 00b28ddf47aef9cea7'
[ 3.785144] platform regulatory.0: Direct firmware load for regulatory.db failed with error -2
[ 3.794164] cfg80211: failed to load regulatory.db
[ 3.799250] VSD_3V3: disabling
[ 3.802783] ALSA device list:
[ 3.805811] #0: mx6ul-wm8960
[ 3.826671] EXT4-fs (mmcblk1p2): couldn't mount as ext3 due to feature incompatibilities
[ 4.042470] EXT4-fs (mmcblk1p2): recovery complete
[ 4.054502] EXT4-fs (mmcblk1p2): mounted filesystem with ordered data mode. Opts: (null)
[ 4.063081] VFS: Mounted root (ext4 filesystem) on device 179:2.
[ 4.089493] devtmpfs: mounted
[ 4.098531] Freeing unused kernel memory: 1024K
[ 4.337187] EXT4-fs (mmcblk1p2): re-mounted. Opts: errors=remount-ro,data=ordered

I am not able to get dump in /proc/vmcore or /var/crash but this is probably something to configure I guess :

# ls /proc/vmcore /var/crash
ls: /proc/vmcore: No such file or directory
ls: /var/crash: No such file or directory