Comment 9 for bug 1694859

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>