[Xposed Framework Modules] xByt3z:
I'm running 6.0 on a Nexus 6 with Xposed installed. I'm willing to help you test. I'll be able to provide dmesg, logcat and Xposed logs for you. Let me know what you think.

Edit:

Here's a quick snippet of the logcat, the only module I use is Snapprefs, Xposed v77, no custom kernel, running MRA58R with Chainfire's bootimage (MRA58K)

I/Xposed ( 392): Loading class com.marz.snapprefs.HookMethods
W/main ( 392): type=1400 audit(0.0:20): avc: denied { call } for scontext=u:r:zygote:s0 tcontext=u:r:servicemanager:s0 tclass=binder permissive=0
W/main ( 392): type=1400 audit(0.0:21): avc: denied { call } for scontext=u:r:zygote:s0 tcontext=u:r:servicemanager:s0 tclass=binder permissive=0
E/JavaBinder( 392): !!! FAILED BINDER TRANSACTION !!! (parcel size = 80)
6,1610,6422456,-;binder: 392:392 transaction failed 29201, size 0-0
6,1611,6422626,-;binder: 392:392 transaction failed 29201, size 80-0
36,1612,6423028,-;type=1400 audit(1447611035.082:20): avc: denied { call } for pid=392 comm="main" scontext=u:r:zygote:s0 tcontext=u:r:servicemanager:s0 tclass=binder permissive=0
36,1613,6423248,-;type=1400 audit(1447611035.082:21): avc: denied { call } for pid=392 comm="main" scontext=u:r:zygote:s0 tcontext=u:r:servicemanager:s0 tclass=binder permissive=0
6,1614,6434233,-;binder: 392:392 transaction failed 29201, size 84-0
E/ServiceManager( 392): error in getService
E/ServiceManager( 392): android.os.DeadObjectException: Transaction failed on small parcel; remote process probably died
E/ServiceManager( 392): at android.os.BinderProxy.transactNative(Native Method)
E/ServiceManager( 392): at android.os.BinderProxy.transact(Binder.java:503)
E/ServiceManager( 392): at android.os.ServiceManagerProxy.getService(ServiceManagerNative.java:123)
E/ServiceManager( 392): at android.os.ServiceManager.getService(ServiceManager.java:55)
E/ServiceManager( 392): at android.os.storage.StorageManager.getVolumeList(StorageManager.java:864)
E/ServiceManager( 392): at android.os.Environment$UserEnvironment.getExternalDirs(Environment.java:83)
E/ServiceManager( 392): at android.os.Environment.getExternalStorageDirectory(Environment.java:337)
E/ServiceManager( 392): at com.marz.snapprefs.HookMethods.<clinit>(HookMethods.java:99)
E/ServiceManager( 392): at java.lang.Class.newInstance(Native Method)
E/ServiceManager( 392): at de.robv.android.xposed.XposedBridge.loadModule(XposedBridge.java:477)
E/ServiceManager( 392): at de.robv.android.xposed.XposedBridge.loadModules(XposedBridge.java:432)
E/ServiceManager( 392): at de.robv.android.xposed.XposedBridge.main(XposedBridge.java:102)
E/JavaBinder( 392): !!! FAILED BINDER TRANSACTION !!! (parcel size = 84)
E/ServiceManager( 392): error in getService
E/ServiceManager( 392): android.os.DeadObjectException: Transaction failed on small parcel; remote process probably died
E/ServiceManager( 392): at android.os.BinderProxy.transactNative(Native Method)
E/ServiceManager( 392): at android.os.BinderProxy.transact(Binder.java:503)
E/ServiceManager( 392): at android.os.ServiceManagerProxy.getService(ServiceManagerNative.java:123)
E/ServiceManager( 392): at android.os.ServiceManager.getService(ServiceManager.java:55)
E/ServiceManager( 392): at android.app.ActivityThread.getPackageManager(ActivityThread.java:1674)
E/ServiceManager( 392): at android.os.storage.StorageManager.getVolumeList(StorageManager.java:872)
E/ServiceManager( 392): at android.os.Environment$UserEnvironment.getExternalDirs(Environment.java:83)
E/ServiceManager( 392): at android.os.Environment.getExternalStorageDirectory(Environment.java:337)
E/ServiceManager( 392): at com.marz.snapprefs.HookMethods.<clinit>(HookMethods.java:99)
E/ServiceManager( 392): at java.lang.Class.newInstance(Native Method)
E/ServiceManager( 392): at de.robv.android.xposed.XposedBridge.loadModule(XposedBridge.java:477)
E/ServiceManager( 392): at de.robv.android.xposed.XposedBridge.loadModules(XposedBridge.java:432)
E/ServiceManager( 392): at de.robv.android.xposed.XposedBridge.main(XposedBridge.java:102)
E/Xposed ( 392): java.lang.ExceptionInInitializerError
E/Xposed ( 392): at java.lang.Class.newInstance(Native Method)
E/Xposed ( 392): at de.robv.android.xposed.XposedBridge.loadModule(XposedBridge.java:477)
E/Xposed ( 392): at de.robv.android.xposed.XposedBridge.loadModules(XposedBridge.java:432)
E/Xposed ( 392): at de.robv.android.xposed.XposedBridge.main(XposedBridge.java:102)
E/Xposed ( 392): Caused by: java.lang.NullPointerException: Attempt to invoke interface method 'java.lang.String[] android.content.pm.IPackageManager.getPackagesForUid(int)' on a null object reference
E/Xposed ( 392): at android.os.storage.StorageManager.getVolumeList(StorageManager.java:872)
E/Xposed ( 392): at android.os.Environment$UserEnvironment.getExternalDirs(Environment.java:83)
E/Xposed ( 392): at android.os.Environment.getExternalStorageDirectory(Environment.java:337)
E/Xposed ( 392): at com.marz.snapprefs.HookMethods.<clinit>(HookMethods.java:99)
E/Xposed ( 392): ... 4 more
I/SamplingProfilerIntegration( 392): Profiling disabled.