Why IDA debugger on android doesn't show all threads?

Question

My IDA Version is IDA Pro 7.5 SP2. And I'm trying to debug a .so file inside a .apk file.

Here's what I've done:

• download a x86_64 system image android emulator from android studio
• install that .apk on emulator and run it.
• push android_x64_server inside /dbgsrv of IDA installation folder into /data folder of emulator.
  (adb push ida-folder/dbgsrv/android_x64_server /data)
• execute the following command:

adb shell
cd /data
chmod 777 ./android_x86_server  
./android_x86_server

• back into windows terminal, and execute adb forward tcp:23946 tcp:23946
• open IDA Pro, select remote linux debugger attach to apk's process

And the "Threads" window only show one thread, which is not true because when I execute ps -T -p [pid] inside adb shell, and found that the process is a multi-thread application.

Here is the screenshot:

Answer 1

Since Android 10.0, it has move some of its important library into different path ( including libc.so )
so IDA can't automatically found where it is like it used to.

You need to execute export IDA_LIBC_PATH=/apex/com.android.runtime/lib/bionic/libc.so to tell IDA where libc.so can be found.

Answer 2

for debugging a 64 bit process.

export IDA_LIBC_PATH=/apex/com.android.runtime/lib64/bionic/libc.so