[Nexus 5 Original Android Development] relevant_placeholder:
I'll post some logcats later using the method and your app as an example.

EDIT:

Afwall not working:

W/iptables( 3681): type=1400 audit(0.0:61): avc: denied { create } for scontext=u:r:init_shell:s0 tcontext=u:r:init_shell:s0 tclass=rawip_socket
W/iptables( 3681): type=1400 audit(0.0:62): avc: denied { create } for scontext=u:r:init_shell:s0 tcontext=u:r:init_shell:s0 tclass=rawip_socket
I/AFWall ( 2731): command 'iptables -P INPUT ACCEPT' exited with status 3
I/AFWall ( 2731): Output:
I/AFWall ( 2731): iptables v1.4.20: can't initialize iptables table `filter': Permission denied
I/AFWall ( 2731): Perhaps iptables or your kernel needs to be upgraded.
W/InputMethodManagerService( 852): Window already focused, ignoring focus gain of: com.android.internal.view.IInputMethodClient$Stub$Proxy@93b181e attribute=null, token = android.os.BinderProxy@17f03ee9
D/audio_hw_primary( 218): disable_audio_route: reset and update mixer path: low-latency-playback
D/audio_hw_primary( 218): disable_snd_device: snd_device(2: speaker)

EX app:

W/chown ( 4103): type=1400 audit(0.0:74): avc: denied { search } for name="eu.chainfire.supersu" dev="mmcblk0p28" ino=1475046 scontext=u:r:init_shell:s0 tcontext=u:object_r:app_data_file:s0 tclass=dir
W/chown ( 4103): type=1400 audit(0.0:75): avc: denied { search } for name="eu.chainfire.supersu" dev="mmcblk0p28" ino=1475046 scontext=u:r:init_shell:s0 tcontext=u:object_r:app_data_file:s0 tclass=dir
W/chown ( 4104): type=1400 audit(0.0:76): avc: denied { search } for name="eu.chainfire.supersu" dev="mmcblk0p28" ino=1475046 scontext=u:r:init_shell:s0 tcontext=u:object_r:app_data_file:s0 tclass=dir
W/chown ( 4104): type=1400 audit(0.0:77): avc: denied { search } for name="eu.chainfire.supersu" dev="mmcblk0p28" ino=1475046 scontext=u:r:init_shell:s0 tcontext=u:object_r:app_data_file:s0 tclass=dir
W/chown ( 4105): type=1400 audit(0.0:78): avc: denied { search } for name="eu.chainfire.supersu" dev="mmcblk0p28" ino=1475046 scontext=u:r:init_shell:s0 tcontext=u:object_r:app_data_file:s0 tclass=dir
W/chown ( 4105): type=1400 audit(0.0:79): avc: denied { search } for name="eu.chainfire.supersu" dev="mmcblk0p28" ino=1475046 scontext=u:r:init_shell:s0 tcontext=u:object_r:app_data_file:s0 tclass=dir
W/chown ( 4106): type=1400 audit(0.0:80): avc: denied { search } for name="eu.chainfire.supersu" dev="mmcblk0p28" ino=1475046 scontext=u:r:init_shell:s0 tcontext=u:object_r:app_data_file:s0 tclass=dir
W/chown ( 4106): type=1400 audit(0.0:81): avc: denied { search } for name="eu.chainfire.supersu" dev="mmcblk0p28" ino=1475046 scontext=u:r:init_shell:s0 tcontext=u:object_r:app_data_file:s0 tclass=dir
W/chmod ( 4107): type=1400 audit(0.0:82): avc: denied { search } for name="eu.chainfire.supersu" dev="mmcblk0p28" ino=1475046 scontext=u:r:init_shell:s0 tcontext=u:object_r:app_data_file:s0 tclass=dir
W/mkdir ( 4120): type=1400 audit(0.0:83): avc: denied { search } for name="eu.chainfire.supersu" dev="mmcblk0p28" ino=1475046 scontext=u:r:init_shell:s0 tcontext=u:object_r:app_data_file:s0 tclass=dir
W/chmod ( 4121): type=1400 audit(0.0:84): avc: denied { search } for name="eu.chainfire.supersu" dev="mmcblk0p28" ino=1475046 scontext=u:r:init_shell:s0 tcontext=u:object_r:app_data_file:s0 tclass=dir
W/sh ( 4119): type=1400 audit(0.0:85): avc: denied { search } for name="eu.chainfire.supersu" dev="mmcblk0p28" ino=1475046 scontext=u:r:init_shell:s0 tcontext=u:object_r:app_data_file:s0 tclass=dir
W/chmod ( 4122): type=1400 audit(0.0:86): avc: denied { search } for name="eu.chainfire.supersu" dev="mmcblk0p28" ino=1475046 scontext=u:r:init_shell:s0 tcontext=u:object_r:app_data_file:s0 tclass=dir
D/audio_hw_primary( 218): disable_audio_route: reset and update mixer path: low-latency-playback
D/audio_hw_primary( 218): disable_snd_device: snd_device(2: speaker)
W/GA-SERVICE( 1582): Thread[Thread-130,5,main]: Exception sending hit: HttpHostConnectException
W/GA-SERVICE( 1582): Thread[Thread-130,5,main]: Connection to https://ssl.google-analytics.com refused
W/GA-SERVICE( 1582): Thread[Thread-130,5,main]: Empty hitIds passed to deleteHits.
D/TaskPersister( 852): removeObsoleteFile: deleting file=159_task_thumbnail.png
W/ActivityManager( 852): Activity stop timeout for ActivityRecord{3cfb04d3 u0 flar2.elementalxkernel/.MainActivity t158}
I/ActivityManager( 852): Activity reported stop, but no longer stopping: ActivityRecord{3cfb04d3 u0 flar2.elementalxkernel/.MainActivity t158}
I/ActivityManager( 852): Waited long enough for: ServiceRecord{1f693ec2 u0 com.google.android.gms/.wearable.service.WearableService}
I/OpenHelperManager( 3232): helper was already closed and is being re-opened
W/GA-SERVICE( 1582): Thread[Thread-130,5,main]: Exception sending hit: HttpHostConnectException
W/GA-SERVICE( 1582): Thread[Thread-130,5,main]: Connection to https://ssl.google-analytics.com refused
W/GA-SERVICE( 1582): Thread[Thread-130,5,main]: Empty hitIds passed to deleteHits.
I/ElementalX Kernel( 4015): Schedule update check...
W/app_process( 4148): type=1400 audit(0.0:87): avc: denied { write } for name="system@framework@boot.art" dev="mmcblk0p28" ino=491524 scontext=u:r:shell:s0 tcontext=u:object_r:dalvikcache_data_file:s0 tclass=file
D/AndroidRuntime( 4148):
D/AndroidRuntime( 4148): >>>>>> AndroidRuntime START com.android.internal.os.RuntimeInit <<<<<<
D/AndroidRuntime( 4148): CheckJNI is OFF
D/AndroidRuntime( 4148): Calling main entry com.android.commands.am.Am
W/mkdir ( 4178): type=1400 audit(0.0:88): avc: denied { search } for name="eu.chainfire.supersu" dev="mmcblk0p28" ino=1475046 scontext=u:r:init_shell:s0 tcontext=u:object_r:app_data_file:s0 tclass=dir
W/chmod ( 4179): type=1400 audit(0.0:89): avc: denied { search } for name="eu.chainfire.supersu" dev="mmcblk0p28" ino=1475046 scontext=u:r:init_shell:s0 tcontext=u:object_r:app_data_file:s0 tclass=dir
W/sh ( 4177): type=1400 audit(0.0:90): avc: denied { search } for name="eu.chainfire.supersu" dev="mmcblk0p28" ino=1475046 scontext=u:r:init_shell:s0 tcontext=u:object_r:app_data_file:s0 tclass=dir
W/chmod ( 4180): type=1400 audit(0.0:91): avc: denied { search } for name="eu.chainfire.supersu" dev="mmcblk0p28" ino=1475046 scontext=u:r:init_shell:s0 tcontext=u:object_r:app_data_file:s0 tclass=dir
D/AndroidRuntime( 4148): Shutting down VM
D/AndroidRuntime( 4191):
D/AndroidRuntime( 4191): >>>>>> AndroidRuntime START com.android.internal.os.RuntimeInit <<<<<<
D/AndroidRuntime( 4191): CheckJNI is OFF
W/app_process( 4191): type=1400 audit(0.0:92): avc: denied { write } for name="system@framework@boot.art" dev="mmcblk0p28" ino=491524 scontext=u:r:shell:s0 tcontext=u:object_r:dalvikcache_data_file:s0 tclass=file
D/AndroidRuntime( 4191): Calling main entry com.android.commands.am.Am
W/mkdir ( 4224): type=1400 audit(0.0:93): avc: denied { search } for name="eu.chainfire.supersu" dev="mmcblk0p28" ino=1475046 scontext=u:r:init_shell:s0 tcontext=u:object_r:app_data_file:s0 tclass=dir
W/chmod ( 4225): type=1400 audit(0.0:94): avc: denied { search } for name="eu.chainfire.supersu" dev="mmcblk0p28" ino=1475046 scontext=u:r:init_shell:s0 tcontext=u:object_r:app_data_file:s0 tclass=dir
W/sh ( 4223): type=1400 audit(0.0:95): avc: denied { search } for name="eu.chainfire.supersu" dev="mmcblk0p28" ino=1475046 scontext=u:r:init_shell:s0 tcontext=u:object_r:app_data_file:s0 tclass=dir
W/chmod ( 4226): type=1400 audit(0.0:96): avc: denied { search } for name="eu.chainfire.supersu" dev="mmcblk0p28" ino=1475046 scontext=u:r:init_shell:s0 tcontext=u:object_r:app_data_file:s0 tclass=dir

restored chainfire kernel (without reflashing su) :

afwall:

D/AFWall ( 2867): Starting root shell...
I/AFWall ( 2867): [libsuperuser] [SU%] START
D/OpenGLRenderer( 2867): Render dirty regions requested: true
D/Atlas ( 2867): Validating map...
I/Adreno-EGL( 2867): <qeglDrvAPI_eglInitialize:410>: QUALCOMM Build: 10/02/14, c40da3f, Ifda814c646
I/OpenGLRenderer( 2867): Initialized EGL, version 1.4
D/OpenGLRenderer( 2867): Enabling debug mode 0
D/AFWall ( 2867): Root shell is open

And your app works too..