ubuntu@grotrian:~$ cat /proc/version
Linux version 4.10.0-28-generic (buildd@bos01-arm64-012) (gcc version 6.3.0 20170406 (Ubuntu/Linaro 6.3.0-12ubuntu2) ) #32-Ubuntu SMP Fri Jun 30 05:33:10 UTC 2017
ubuntu@grotrian:~$ cat /proc/cmdline 
BOOT_IMAGE=/boot/vmlinuz-4.10.0-28-generic root=UUID=fcf02e40-f2bd-4c9f-a9bd-1abe132cbc9e ro acpi=on crashkernel=1G-:512M
ubuntu@grotrian:~$ echo c | sudo tee /proc/sysrq-trigger 
c

<crash/reboot>

ubuntu@grotrian:~$ sudo crash /usr/lib/debug/boot/vmlinux-4.10.0-28-generic /var/crash/201707102147/dump.201707102147 

crash 7.1.8
Copyright (C) 2002-2016  Red Hat, Inc.
Copyright (C) 2004, 2005, 2006, 2010  IBM Corporation
Copyright (C) 1999-2006  Hewlett-Packard Co
Copyright (C) 2005, 2006, 2011, 2012  Fujitsu Limited
Copyright (C) 2006, 2007  VA Linux Systems Japan K.K.
Copyright (C) 2005, 2011  NEC Corporation
Copyright (C) 1999, 2002, 2007  Silicon Graphics, Inc.
Copyright (C) 1999, 2000, 2001, 2002  Mission Critical Linux, Inc.
This program is free software, covered by the GNU General Public License,
and you are welcome to change it and/or distribute copies of it under
certain conditions.  Enter "help copying" to see the conditions.
This program has absolutely no warranty.  Enter "help warranty" for details.
 
GNU gdb (GDB) 7.6
Copyright (C) 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "aarch64-unknown-linux-gnu"...

      KERNEL: /usr/lib/debug/boot/vmlinux-4.10.0-28-generic
    DUMPFILE: /var/crash/201707102147/dump.201707102147  [PARTIAL DUMP]
        CPUS: 48
        DATE: Mon Jul 10 21:47:34 2017
      UPTIME: 00:35:42
LOAD AVERAGE: 0.13, 0.31, 0.26
       TASKS: 578
    NODENAME: grotrian
     RELEASE: 4.10.0-28-generic
     VERSION: #32-Ubuntu SMP Fri Jun 30 05:33:10 UTC 2017
     MACHINE: aarch64  (unknown Mhz)
      MEMORY: 128 GB
       PANIC: "sysrq: SysRq : Trigger a crash"
         PID: 5136
     COMMAND: "tee"
        TASK: ffff801f4682ba00  [THREAD_INFO: ffff801f4682ba00]
         CPU: 45
       STATE: TASK_RUNNING (SYSRQ)

crash> bt
PID: 5136   TASK: ffff801f4682ba00  CPU: 45  COMMAND: "tee"
 #0 [ffff801f48e8ba40] crash_kexec at ffff00000816ce94
 #1 [ffff801f48e8ba70] die at ffff00000808b23c
 #2 [ffff801f48e8bab0] do_page_fault at ffff000008a099e4
 #3 [ffff801f48e8bb20] do_translation_fault at ffff000008a09cb8
 #4 [ffff801f48e8bb50] do_mem_abort at ffff000008081490
 #5 [ffff801f48e8bd50] el1_ia at ffff000008082f28
     PC: ffff00000863ffcc  [sysrq_handle_crash+36]
     LR: ffff000008640c54  [__handle_sysrq+292]
     SP: ffff801f48e8bd50  PSTATE: 00400145
    X29: ffff801f48e8bd50  X28: ffff801f4682ba00  X27: ffff000008a22000
    X26: 0000000000000040  X25: 0000000000000123  X24: 0000000000000015
    X23: 0000000000000000  X22: 0000000000000004  X21: ffff0000092a9500
    X20: 0000000000000063  X19: ffff000009231000  X18: ffffffffffffffff
    X17: 0000ffff796f43d0  X16: ffff00000829e9a8  X15: ffff000009208b10
    X14: ffff00008935c7bf  X13: ffff00000935c7cd  X12: 7565726f632f5345
    X11: ffff000009231000  X10: 0000000005f5e0ff   X9: 00000000ffffffd0
     X8: ffff0000086676b0   X7: 6767697254203a20   X6: 00000000000004fb
     X5: 0000000000000000   X4: 0000000000000000   X3: 0000000000000000
     X2: 0000000000040a11   X1: 0000000000000000   X0: 0000000000000001
 #6 [ffff801f48e8bd60] __handle_sysrq at ffff000008640c50
 #7 [ffff801f48e8bda0] write_sysrq_trigger at ffff000008641108
 #8 [ffff801f48e8bdc0] proc_reg_write at ffff00000831ec84
 #9 [ffff801f48e8be00] __vfs_write at ffff00000829beac
#10 [ffff801f48e8be30] vfs_write at ffff00000829d3c8
#11 [ffff801f48e8be70] sys_write at ffff00000829ea10
#12 [ffff801f48e8bed0] el0_svc_naked at ffff0000080838ec
     PC: 0000000000000003   LR: 0000ffff79745cb8   SP: 0000000020000000
    X29: 0000ffffd17124b0  X28: 0000ffff796f5498  X27: 0000ffffd17124b0
    X26: 0000000000000001  X25: 000000002d76dbf0  X24: 0000000000417000
    X23: 0000000000000002  X22: 0000000000000002  X21: 0000ffff797c9638
    X20: 0000000000000002  X19: 000000002d76dbf0  X18: 0000ffffd1712638
    X17: 0000000000000002  X16: 0000000000040a11  X15: 0000ffff796f43d0
    X14: 0000000000000000  X13: 00000000000007fe  X12: 0000000000000018
    X11: 0000000000000000  X10: 7565726f632f5345   X9: 0000000000000000
     X8: 0101010101010101   X7: 000000002d76d050   X6: 0000000000000040
     X5: 0000000000000240   X4: 000000000040582e   X3: 00000000fbad2c87
     X2: 00000000ffffffff   X1: 0000000000000000   X0: 0000000000000002
    ORIG_X0: 0000000000000000  SYSCALLNO: 0  PSTATE: 00000040
crash>