I come with what is probably a silly question after I did not manage to stumble upon someone with the exact same situation while doing some googling around.
I have a Nexus 4, running the older Android 4.2.2 (did not update as I have some custom patches in there).
My phone has also been rooted for quite a while and working perfectly until recently something broke it (did not manage to find out when I broke it).
I have CWM installed and that is working fine.
I have SuperSu installed, now the latest version.
If I boot my phone into Recovery Mode and then I access it with the shell commands:
a) I mount the sdcard partition
b) I run
$ ./adb shell
~ # /system/xbin/su -
All works fine.
If I boot my phone normally and I run SuperSU, then I get: "no su binary installed" and the app kicks me out.
If I connect with ADB to it .. then I see that the binary is indeed in /system/xbin/su but trying to run it just doesn't do anything.
The process "freezes" and I don't get a command prompt anymore.
I can cancel it with CTRL+C and try to run it again but still ...nothing happens
This is one point where I am missing the Linux strace which I did not think of having here but would have enabled me to at least see what the SU binary is doing when it is not returning control to the command prompt or at least giving an error
Any idea what might be happening ?
Also..why is "su" working fine when called from the bootloader/CWM and why freezing when calling from the normal running system (aside from that funky error that no su binary is installed).
I tried so far flashing also an older version of SuperSU...same result, then went back to v1.94
Sorry if my problem is stupid but I don't seem to get my way around it...