[FS#112] Kernel: SysRq spams on boot since kernel 4.4.19

[LEDE Bugs]

A new Flyspray task has been opened.  Details are below. 

User who did this - Koen Vandeputte (xback) 

Attached to Project - LEDE Project
Summary - Kernel: SysRq spams on boot since kernel 4.4.19
Task Type - Bug Report
Category - Kernel
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Low
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - [   19.818854] fec 2188000.ethernet eth0: Link is Up - 1Gbps/Full - flow control rx/tx
[   19.826558] br-wan: port 1(eth0) entered forwarding state
[   19.832032] br-wan: port 1(eth0) entered forwarding state
[   19.837631] IPv6: ADDRCONF(NETDEV_CHANGE): br-wan: link becomes ready
[   21.828363] br-wan: port 1(eth0) entered forwarding state
[   45.980678] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
[   46.014876] IPv6: ADDRCONF(NETDEV_UP): wlan1: link is not ready
[   50.024852] wlan1: Trigger new scan to find an IBSS to join
[   51.412986] wlan1: Selected IBSS BSSID f8:79:77:57:aa:7d based on configured SSID
[   51.425134] sysrq: SysRq : HELP : loglevel(0-9) reboot(b) 
[   51.429879] IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready
[   51.436858] crash(c) terminate-all-tasks(e) memory-full-oom-kill(f) kill-all-tasks(i) thaw-filesystems(j) show-backtrace-all-active-cpus(l) show-memory-usage(m) nice-all-RT-tasks(n) poweroff(o) show-registers(p) show-all-timers(q) sync(s) show-task-states(t) unmount(u) show-blocked-tasks(w) 
[   51.463067] sysrq: SysRq : HELP : loglevel(0-9) reboot(b) crash(c) terminate-all-tasks(e) memory-full-oom-kill(f) kill-all-tasks(i) thaw-filesystems(j) show-backtrace-all-active-cpus(l) show-memory-usage(m) nice-all-RT-tasks(n) poweroff(o) show-registers(p) show-all-timers(q) sync(s) show-task-states(t) unmount(u) show-blocked-tasks(w) 
[   60.328513] imx-sdma 20ec000.sdma: external firmware not found, using ROM firmware

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=112