Trace/breakpoint trap on UserLAnd (Android App)

[TheOiseth]

I installed UserLand (v2.7.3) on my android phone, lxde desktop. Target process after injection fails with an error "Trace/breakpoint trap". Arch: aarch64, linux kernel version 3.18.71

[kubo]

Though I don't have Android suitable to run UserLAnd and I have not investigated it, I guest that injector doesn't work on it.
That's because:

1. UserLAnd uses PRoot to trap system calls.
2. PRoot uses ptrace.
3. Injector also uses ptrace.
4. Only one process can trace a process. However two processes try to trace the target process. I guess that injector loses.

If this issue is fixed, injector would work. Otherwise, it doesn't.