Android OpenGL Texture memory occupied

I try to solve an interesting memory issue recently.

There is a viewer page in a project I owned recently.
The whole app will be closed without showing the "force close dialog" if we keep entering and leaving that page.
It seems like a memory leak , so I try to use LeakCanary to check it but found nothing related.

Then I try to use the  Memory Monitor  in Android Studio to monitor the memory usage.
But all the memory is released after the GC.

So I can only record the logs during that period and check it line by line.
Then I notice that many process is killed by Activity Manager during that period.
Even a process with OomAdj 0 (contain a foreground activity) is killed too.
It's quite abnormal that Activity Manager will kill so many process when I can't found any app spend lots of memory.
It pops into my mind there is a lesson learned I got in HTC .
In the early version of Android , the memory of a Bitmap can be allocated in the native layer.
Is it the reason it's not watched by the Memory Monitor?

So I try to survey whether there is any command I can use to check the memory usage in native layer.
Then I found the command below.

adb shell dumpsys meminfo <package_name|pid> [-d]

After I execute it, I LOL.
EGL mtrack is fucking high!!

It seems like the memory related to the OpenGL in this page is not released correctly.

After I found the hint, it's much easier to solve this issue.